JP2016103861A - Projector and control method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projector capable of easily performing operation for correcting pincushion distortion, and further to provide a control method of the projector.SOLUTION: A projector 1 causes four corner portions of a projection image indicated by image light modulated in a liquid crystal light valve 12 and eight identification images individually corresponding to four sides among the corner portions to be displayed by an OSD processing section 25 by projecting the image light from a projection optical system, receives operation selecting one out of the eight identification images displayed by an input operation section 22, highlights and displays an identification image G selected by the operation such that it can be discriminated from the other identification image G, receives operation for moving a predetermined position on the corner portions or the sides by the input operation section 22 in a state of the identification image G being displayed, and executes pincushion distortion correction in association with movement of the predetermined position by an image correction section 26 while moving the predetermined position on the corner portions or the sides corresponding to the identification image G selected on the basis of the operation received.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a projector and a method for controlling the projector.

  Conventionally, in a projector, in order to correct the trapezoidal distortion correction caused by the installation angle of the projector with respect to the projection surface by the user's operation, a projector that makes the operation easy by displaying a correction image is known (for example, Patent Document 1).

JP 2010-250041 A

By the way, depending on the state of the projection surface, distortion called pincushion distortion may occur in the projected image. Since the pincushion distortion cannot be corrected only by moving the corners of the projected image, the conventional configuration cannot cope with it, and a projector capable of easily correcting the pincushion distortion has been demanded.
SUMMARY An advantage of some aspects of the invention is that it provides a projector capable of easily performing an operation for correcting pincushion distortion, and a control method for the projector.

To achieve the above object, the present invention provides a light source, a light modulation device that modulates light emitted from the light source, a projection optical system that projects image light modulated by the light modulation device, and the image. An identification image display unit that displays eight identification images respectively corresponding to four corners of an image indicated by light and four sides between the corners by projecting image light from the projection optical system. A selection operation unit that accepts an operation for selecting one of the eight identification images displayed by the identification image display unit, and the identification image selected by the selection operation unit can be distinguished from other identification images. An emphasis display unit for emphasizing, a move operation unit for receiving an operation for moving a predetermined position on the corner or the side in a state where the highlight display unit displays the identification image, and the movement Operations accepted by the operation unit And an image correction unit that moves the predetermined position on the corner or the side corresponding to the identification image selected by the selection operation unit, and executes pincushion distortion correction associated with the movement. It is characterized by that.
According to the present invention, eight identification images respectively corresponding to the four corners and four sides of the projected image are displayed, and the identification selected according to an operation of selecting one from these identification images Since the image is displayed and the pincushion distortion correction is performed based on the operation on the identification image, the operation for performing the pincushion distortion correction can be easily performed.

In the projector according to the aspect of the invention, the highlighting unit may include direction marks corresponding to at least two axes that can be moved by the moving operation unit, with respect to the identification image corresponding to the corner. A direction mark corresponding to one axis that can be moved by the movement operation unit is added to the identification image selected by the selection operation unit and corresponding to the side portion. It adds to the said identification image selected by (4).
According to the present invention, it is possible to appropriately guide the operation by displaying optimum direction marks for the corner and the side, respectively, and it is possible to make the operation for correcting the pincushion distortion easier.

In the projector, the pincushion distortion correction mode for performing pincushion distortion correction and the trapezoidal distortion correction mode for performing trapezoidal distortion correction can be selected. In the trapezoidal distortion correction mode, the identification image display is performed. The unit displays four identification images respectively corresponding to the four corners of the image, and the selection operation unit selects one of the four identification images displayed by the identification image display unit. The movement operation unit receives an operation for moving the corner in a state where the highlighting display is displaying the identification image, and the image correction unit is received by the movement operation unit. Based on the operation, the corner corresponding to the identification image selected by the selection operation unit is moved, and the trapezoidal distortion correction associated with the movement is executed.
According to the present invention, an operation for correcting trapezoidal distortion as well as pincushion distortion correction can be easily performed.

In the projector according to the aspect of the invention, the highlighting unit may not display the seven other identification images that are not selected by the selection operation unit in the pincushion distortion correction mode, and Is characterized in that the three other identification images not selected by the selection operation unit are not displayed.
According to the present invention, it is possible to make the operation easier by performing optimum display for each of the pincushion distortion correction and the trapezoid distortion correction.

In the projector according to the aspect of the invention, the highlighting unit may be configured such that a predetermined position on the corner or the side selected by the selection operation unit is located at a limit of a movable range and is in a predetermined direction. In a state where it cannot move, the direction mark corresponding to the direction is made inconspicuous.
According to the present invention, it is possible to notify the limit of the operation for moving the corners or sides depending on the display state of the mark, so that the operation for correcting the pincushion distortion can be made easier.

In order to achieve the above object, the present invention provides a projector control method for projecting image light obtained by modulating light emitted from a light source, the corners of four corners of an image indicated by the image light, and An operation of displaying eight identification images respectively corresponding to four sides between the corners by projecting image light from the projection optical system, and selecting one of the eight identification images. The received and selected identification image is highlighted so as to be distinguishable from other identification images, and an operation for moving a predetermined position on the corner or the side in a state where the identification image is highlighted. Based on the received operation, the predetermined position on the corner or the side corresponding to the identification image selected by the selection operation unit is moved, and the pincushion distortion correction associated with the movement is performed. The And butterflies.
According to the present invention, eight identification images respectively corresponding to the four corners and four sides of the projected image are displayed, and the identification selected according to an operation of selecting one from these identification images Since the image is displayed and the pincushion distortion correction is performed based on the operation on the identification image, the operation for performing the pincushion distortion correction can be easily performed.

  According to the present invention, an operation for correcting pincushion distortion can be easily performed.

It is a block diagram which shows schematic structure of a projector. It is explanatory drawing for demonstrating trapezoid distortion, (a) is the side view which looked at the projector and the projection surface from the side, (b) is a front view which shows a projection surface. It is explanatory drawing for demonstrating trapezoid distortion, (a) is the side view which looked at the projector and the projection surface from the side, (b), (d) is a front view which shows a projection surface, (c) is It is a figure which shows the pixel area | region of a liquid crystal light valve. It is explanatory drawing for demonstrating pincushion distortion, (a) is the perspective view which looked at the projector and the projection surface from diagonally upward, (b), (d), (f), (h) is the pixel of a liquid crystal light valve The figure which shows an area | region, (c), (e), (g) is a front view which shows a projection surface. It is a flowchart explaining operation | movement of a projector when a trapezoid distortion correction key and a pincushion distortion correction key are operated. It is a flowchart explaining the operation | movement of a projector when the pincushion distortion correction key is operated. It is a figure which shows the image displayed at the time of execution of trapezoid distortion correction, (a) is a figure which shows a corner selection image, (b) is a figure which shows a corner adjustment image. (A)-(g) is explanatory drawing for demonstrating the correction procedure of trapezoid distortion, and is a front view which shows a projection surface. It is a figure which shows an adjustment part selection image. It is a figure which shows a corner adjustment image. It is a figure which shows an edge adjustment image. (A)-(i) is explanatory drawing for demonstrating the movement of the corner | angular part of an image formation area, and is a figure which shows the pixel area | region of a liquid crystal light valve. (A)-(c) is explanatory drawing for demonstrating the movement of the midpoint of the edge | side of the horizontal direction of an image formation area, and is a figure which shows the pixel area of a liquid crystal light valve. (A)-(c) is explanatory drawing for demonstrating the movement of the midpoint of the edge | side of the orthogonal | vertical direction of an image formation area, and is a figure which shows the pixel area | region of a liquid crystal light valve. (A)-(g) is explanatory drawing for demonstrating the correction procedure of a pincushion distortion, and is a front view which shows a projection surface. (A), (b) is explanatory drawing for demonstrating the correction | amendment procedure of a pincushion distortion, and is a figure which shows the pixel area | region of a liquid crystal light valve.

Hereinafter, the projector of this embodiment will be described with reference to the drawings.
The projector modulates the light emitted from the light source to form an image based on image information input from the outside (hereinafter referred to as “input image”), and this image is applied to a surface (hereinafter referred to as a screen or a wall surface). It is an optical device that projects on a “projection surface”.

FIG. 1 is a block diagram illustrating a schematic configuration of the projector 1.
As shown in FIG. 1, the projector 1 includes an image projection unit 10, a control unit 20, a storage unit 21, an input operation unit 22, an image information input unit 23, an image processing unit 24, an OSD processing unit 25, an image correction unit 26, and the like. It has.

  The image projection unit 10 includes a light source 11, three liquid crystal light valves 12 (12R, 12G, 12B) as a light modulation device, a projection lens 13 as a projection optical system, a light modulation device drive unit 14, and the like. The image projection unit 10 corresponds to a display unit, modulates the light emitted from the light source 11 by the liquid crystal light valve 12 to form an image (image light), and enlarges and projects this image from the projection lens 13. Displayed on the projection surface S. The projection surface S is composed of fixed and movable screens, and a wall surface or a white board can be used as the projection surface S.

  The light source 11 includes a discharge-type light source lamp 11a made of an ultra-high pressure mercury lamp, a metal halide lamp, or the like, and a reflector 11b that reflects light emitted from the light source lamp 11a in a substantially constant direction. Light emitted from the light source 11 is converted into light having a substantially uniform luminance distribution by an integrator optical system (not shown), and red (R), green (G), and blue, which are the three primary colors of light, by a color separation optical system (not shown). After being separated into the color light components of (B), they are incident on the liquid crystal light valves 12R, 12G, and 12B, respectively.

  The liquid crystal light valve 12 is configured by a liquid crystal panel in which liquid crystal is sealed between a pair of transparent substrates. The liquid crystal light valve 12 is formed with a rectangular pixel region 12a composed of a plurality of pixels 12p arranged in a matrix, and a driving voltage can be applied to the liquid crystal for each pixel 12p. When the light modulation device driving unit 14 applies a driving voltage corresponding to input image information to each pixel 12p, each pixel 12p is set to a light transmittance corresponding to the image information. For this reason, the light emitted from the light source 11 is modulated by transmitting through the pixel region 12a of the liquid crystal light valve 12, and an image corresponding to the image information is formed for each color light.

  The formed images of the respective colors are synthesized for each pixel 12p by a color synthesizing optical system (not shown) to form a color image, and then enlarged and projected onto the projection surface S by the projection lens 13. The projection lens 13 is provided with a zoom mechanism (not shown) for changing the enlargement ratio of the image, and the user can adjust the display size of the image by the zoom mechanism.

  In the present specification, the entire image projected from the projection lens 13 is referred to as a “projected image”. The projected image is an image formed by projecting an image formed in the entire area of the pixel area 12a. Even when the entire area or a part of the area of the pixel area 12a is black (a state that hardly transmits light), A range including a part corresponding to the region is a projection image. In addition, for example, when an image is projected toward the screen, even when a part of the image protrudes from the screen and is projected onto the rear wall surface or the like, a range including the protruding portion is a projection image.

  The control unit 20 includes a CPU (Central Processing Unit), a RAM (Random Access Memory) used for temporary storage of various data (not shown), and the like, according to a control program stored in the storage unit 21. By operating, the overall operation of the projector 1 is controlled. That is, the control unit 20 functions as a computer together with the storage unit 21.

  The storage unit 21 includes a non-volatile memory such as a mask ROM (Read Only Memory), a flash memory, or an FeRAM (Ferroelectric RAM). The storage unit 21 stores a control program for controlling the operation of the projector 1, various setting data for defining operation conditions of the projector 1, and the like.

  The input operation unit 22 receives an input operation from the user, and includes a plurality of operation keys for the user to give various instructions to the projector 1. The operation keys provided in the input operation unit 22 include a power key for switching on / off the power, a menu key for displaying a menu image for performing various settings, and a determination for confirming an item selected by the menu image. Key, four direction keys corresponding to up / down / left / right, cancel key for instructing to cancel operation, pincushion distortion correction key for correcting pincushion distortion, keystone distortion correction key for correcting trapezoidal distortion, etc. . When the user operates various operation keys of the input operation unit 22, the input operation unit 22 outputs an operation signal corresponding to the operation content of the user to the control unit 20. The input operation unit 22 may be configured using a remote control (not shown) capable of remote operation. In this case, the remote control transmits an infrared operation signal corresponding to the user's operation content, and a remote control signal receiving unit (not shown) receives this and transmits it to the control unit 20.

  The image information input unit 23 includes a connection terminal (not shown) for connection to an external image output device (not shown), and various types of image information (image signals) are input from the image output device. The The image information input unit 23 outputs the input image information to the image processing unit 24.

  The image processing unit 24 converts the various types of image information input from the image information input unit 23 into image information representing the gradation of each pixel 12p of the liquid crystal light valves 12R, 12G, and 12B. Here, the converted image information is classified by R, G, and B color lights, and is constituted by a plurality of pixel values corresponding to all the pixels 12p of the liquid crystal light valves 12R, 12G, and 12B. The pixel value defines the light transmittance of the corresponding pixel 12p, and the intensity (gradation) of light emitted from each pixel 12p is defined by this pixel value. In addition, the image processing unit 24 performs image quality adjustment processing for adjusting brightness, contrast, sharpness, hue, and the like on the converted image information based on an instruction from the control unit 20, and the processed image information Is output to the OSD processing unit 25.

  The OSD processing unit 25 performs processing for superimposing an OSD (on-screen display) image such as a menu image or a message image on the input image based on an instruction from the control unit 20. The OSD processing unit 25 includes an OSD memory (not shown), and stores image data representing graphics, fonts, and the like for forming an OSD image. When the control unit 20 instructs to superimpose an OSD image, the OSD processing unit 25 reads necessary image data from the OSD memory, and generates OSD image information for forming a specified OSD image. Then, the OSD image information is combined with the image information input from the image processing unit 24 so that the OSD image is superimposed at a predetermined position on the input image. The image information combined with the OSD image information is output to the image correction unit 26. When there is no instruction to superimpose the OSD image from the control unit 20, the OSD processing unit 25 outputs the image information input from the image processing unit 24 to the image correction unit 26 as it is.

  The image correction unit 26 corrects the image (image information) based on an instruction from the control unit 20. Specifically, the image correction unit 26 sets the image forming area 12e having a shape set by the user in the pixel area 12a of the liquid crystal light valve 12 (see FIG. 3C). Then, the image information input from the OSD processing unit 25 is corrected so that the input image Pi is formed in the image forming area 12e. Further, the image correcting unit 26 sets the black pixel value, that is, the pixel value that minimizes the light transmittance, for the pixel 12p outside the image forming area 12e so as to invalidate the area outside the image forming area 12e. Set. The image correction unit 26 outputs the image information corrected as described above to the light modulation device driving unit 14. When there is no instruction to correct the image from the control unit 20, the image correction unit 26 outputs the image information input from the OSD processing unit 25 to the light modulation device driving unit 14 as it is. In this case, the input image Pi is formed over the entire pixel area 12a. In other words, the entire pixel area 12a becomes the image forming area 12e.

  When the light modulator driving unit 14 drives the liquid crystal light valve 12 according to the input image information, the liquid crystal light valve 12 forms an image according to the image information, and is projected from the projection lens 13 onto the projection surface S as a projection image. Projected.

Next, an outline of the trapezoidal distortion correction of the projector 1 will be described.
2 and 3 are explanatory diagrams for explaining trapezoidal distortion. FIGS. 2A and 3A are side views of the projector 1 and the projection surface S viewed from the side, and FIG. FIGS. 3B and 3D are front views showing the projection surface S, and FIG. 3C is a diagram showing the pixel region 12 a of the liquid crystal light valve 12.

  As shown in FIG. 2A, in a state where the projector 1 is not inclined with respect to the projection surface S, that is, in a state where the optical axis direction of the projection lens 13 is substantially the same as the normal direction of the projection surface S, As shown in FIG. 2B, trapezoidal distortion does not occur in the projection image Ao, and the projection image Ao is displayed in its original shape (rectangular shape). In this case, it is only necessary to form the input image Pi over the entire area of the pixel region 12a, so that it is not necessary to perform correction by the image correction unit 26, and the projection image Ao (input image Pi) is displayed over the entire area of the projection surface S. Thus, the zoom adjustment, the adjustment of the installation position of the projector 1 and the like may be appropriately performed.

  On the other hand, as shown in FIG. 3A, in a state where the projector 1 is inclined with respect to the projection surface S, that is, in a state where the optical axis direction of the projection lens 13 is different from the normal direction of the projection surface S, As shown in FIG. 3B, trapezoidal distortion occurs in the projected image Ao. For this reason, when the input image Pi is formed over the entire pixel region 12a, the input image Pi is displayed distorted due to trapezoidal distortion. Here, as shown in FIG. 3C, an image forming region 12e having a shape capable of canceling the trapezoidal distortion, that is, a shape distorted in the opposite direction to the projected image Ao, is set in the pixel region 12a. If the input image Pi is formed in the image forming region 12e, the distorted shape of the image forming region 12e (input image Pi) is canceled by the trapezoidal distortion, and the projection surface S has an original shape in which the trapezoidal distortion is corrected. The input image Pi is displayed in a (rectangular shape) (see FIG. 3D).

  As described above, the input operation unit 22 includes the trapezoidal distortion correction key, and the user can set the shape of the image forming area 12e by operating the trapezoidal distortion correction key.

Further, when the projection surface S is a curved surface, distortions called pincushion distortion, barrel distortion, etc. (hereinafter referred to as pincushion distortion) occur.
4A and 4B are explanatory diagrams for explaining the pincushion distortion, in which FIG. 4A is a perspective view of the projector and the projection surface viewed obliquely from above, and FIGS. 4B, 4D, 5F, and 5H are liquid crystals. It is a figure which shows the pixel area | region of a light valve, (c), (e), (g) is a front view which shows a projection surface.
FIG. 4A shows a state in which the projector 1 is installed in front of the projection surface S, and no trapezoidal distortion is generated. However, since the projection surface S is configured by a curved surface, the projection image Ao has upper and lower sides. Is distorted to form a convex curve. When the input image Pi is formed over the entire pixel area 12a, the input image Pi that should be displayed in a rectangle if the projection surface S is flat is displayed distorted by pincushion distortion.
In the example of FIG. 4A, the projection surface S is a curved surface (column surface) that is not distorted in the vertical direction, that is, the vertical direction, and whose center is convex to the side away from the projector 1 in the left-right direction, that is, the horizontal direction. In this case, the projection image Ao is distorted into a barrel shape having a curved line up and down.

Here, as shown in FIG. 4B, an image forming area 12e having a shape capable of canceling pincushion distortion, that is, a shape distorted in the opposite direction to the projected image Ao is set in the pixel area 12a. If the input image Pi is formed in the image forming area 12e, the distorted shape of the image forming area 12e (input image Pi) is canceled by the pincushion distortion, and the projection surface S is in the state shown in FIG. Similarly to the above, the input image Pi is displayed in the original shape (rectangular shape) in which the pincushion distortion is corrected.
Furthermore, in the installation state shown in FIG. 4A, when the projector 1 is inclined with respect to the projection surface S as shown in FIG. 3A, as shown in FIG. Both trapezoidal distortion and pincushion distortion as shown in FIG. In this case, the projection image Ao is distorted, for example, into a shape in which the upper portion of the barrel-shaped projection image Ao spreads due to both trapezoidal distortion and pincushion distortion. In such a case, the shape of the image forming area 12e formed in the pixel area 12a is deformed so as to correct one of trapezoidal distortion and pincushion distortion, and further deformed so as to correct the other. The rectangular projection image Ao can be displayed on the projection surface S.

FIG. 4C shows an example in which the projection surface S forms a column surface that is convex toward the projector 1 side. In this case, the projection image Ao has a pincushion distortion opposite to that in FIG. Here, as shown in FIG. 4D, if the image forming area 12e having a shape distorted in the opposite direction to the projected image Ao is set in the pixel area 12a, the pincushion distortion is offset and the projected surface S is offset. A rectangular input image Pi can be displayed.
FIG. 4E shows an example in which the projection surface S forms a column surface that is not distorted in the horizontal direction and is distorted in the vertical direction, and is convex on the side away from the projector 1. In this example, the projection image Ao projected onto the projection surface S is distorted such that the left and right vertical sides are curved. Here, as shown in FIG. 4F, if the image forming area 12e having a shape distorted in the opposite direction to the projected image Ao is set in the pixel area 12a, the pincushion distortion is offset and the projected surface S is offset. A rectangular input image Pi can be displayed.
FIG. 4G shows an example in which the projection surface S forms a columnar surface that is not distorted in the horizontal direction and is distorted in the vertical direction, and is convex to the projector 1 side as opposed to FIG. Indicates. In this example, the projection image Ao projected onto the projection surface S is distorted such that the left and right vertical sides are curved. Here, as shown in FIG. 4 (h), if an image forming area 12e having a shape distorted in the opposite direction to the projected image Ao is set in the pixel area 12a, the pincushion distortion is offset and the projected surface S is offset. A rectangular input image Pi can be displayed.

In addition to the cases shown in FIGS. 4A, 4C, 4E, and 4G, the projection surface S may form a more complicated curved surface such as an elliptical curved surface or a parabolic surface. If the image forming area 12e that cancels the pincushion distortion generated by the curved surface is formed in the pixel area 12a, a rectangular projection image Ao can be displayed.
As described above, the input operation unit 22 is provided with a pincushion distortion correction key, and the user operates the pincushion distortion correction key to set the shape of the image forming area 12e to thereby correct the pincushion distortion. Can be corrected.

FIG. 5 is a flowchart for explaining the operation of the projector 1 when the trapezoidal distortion correction key or the pincushion distortion correction key is operated. 5 and FIG. 6 described later, the control unit 20 functions as an identification image display unit and a highlight display unit in cooperation with the OSD processing unit 25, and the input operation unit 22 is controlled by the control unit 20. Functions as a selection operation unit and a movement operation unit.
When the user operates the keystone distortion correction key or the pincushion distortion correction key while the projector 1 is projecting the input image Pi, the control unit 20 operates according to the flow shown in FIG. The input operation unit 22 is provided with a distortion correction key corresponding to both pincushion distortion correction and trapezoidal distortion correction, and the projector 1 performs pincushion distortion correction and trapezoidal distortion correction according to the operation of the distortion correction key. A menu screen for selection may be displayed and either pincushion distortion correction or trapezoidal distortion correction may be selected on the menu screen by operating the input operation unit 22. In this case, only one operation key of the input operation unit 22 is required, and it is difficult to determine whether the distortion of the projection image Ao on the projection surface S is a trapezoidal distortion or a pincushion distortion. Therefore, the user can intuitively operate the distortion correction key without considering the type of distortion, and the operability can be improved.

As shown in FIG. 5, in step ST <b> 11, the control unit 20 determines whether the correction content instructed by the key operation of the input operation unit 22 is pincushion distortion correction or trapezoid distortion correction. When the pincushion distortion correction is instructed, the control unit 20 executes the pincushion distortion correction mode, executes a pincushion distortion correction process described later in step ST12, and ends this process.
When the trapezoidal distortion correction is instructed, the control unit 20 proceeds to step ST13, shifts to the trapezoidal distortion correction mode, starts the trapezoidal distortion correction process, and instructs the OSD processing unit 25 in step ST14. The corner selection image Ps (see FIG. 7A) is superimposed and displayed on the input image Pi.

FIG. 7 is a diagram illustrating an image displayed when trapezoidal distortion correction is executed, (a) is a diagram illustrating a corner selection image Ps, and (b) is a diagram illustrating a corner adjustment image Pz.
The corner selection image Ps is operable with a title portion Ta, four identification images C corresponding to the four corners of the input image Pi, that is, the four corners of the image forming area 12e, and a message portion Ma on which a message to the user is written. And a key guide portion Ka for guiding the operation thereof.

  The four identification images C are an identification image C1 corresponding to the upper left corner of the image forming area 12e (input image Pi), an identification image C2 corresponding to the upper right corner, and an identification image corresponding to the lower left corner. C3 and an identification image C4 corresponding to the lower right corner, all of which have the same size. The identification images C1 to C4 are arranged in a matrix of 2 rows and 2 columns, and are arranged at corresponding positions (for example, the identification image C1 corresponding to the upper left corner is arranged at the upper left. ) In addition, illustrations representing the corresponding corners are drawn on the identification images C1 to C4.

  The title portion Ta is described as “corner position adjustment”, and it is understood that this function is a function of correcting the trapezoidal distortion by adjusting the position of the corner portion. In addition, the message portion Ma has a description “Please select an area.”, And prompts the user to select any one corner by the identification images C1 to C4. One of the identification images C1 to C4 (the identification image C1 in the example of FIG. 7A) has a different color scheme from the other three, and the identification image C is in a selected state. Show. Hereinafter, the color scheme of the selected identification image C is also referred to as “selected color scheme”, and the color scheme of the unselected identification image C is also referred to as “non-selected color scheme”. The user can select a desired identification image C by operating the direction key. When the user presses the enter key after selecting the identification image C, the selection of the identification image C is confirmed.

Further, as shown in FIG. 7B, the corner adjustment image Pz includes a title part Tb, an enlarged image display part Z, a message part Mb in which a message to the user is written, an operable operation key, and its operation key. A key guide part Kb for guiding the operation is included, and the title part Tb is described as “corner position adjustment” in the same manner as the title part Ta of the corner selection image Ps.
In the enlarged image display unit Z, one identification image C (identification image C1 in the example of FIG. 6) selected from the corner selection image Ps among the above-described four identification images C1 to C4 is enlarged and displayed. The three identification images C that were not selected are not displayed. In addition, a triangular direction mark D indicating the up / down / left / right direction is added to the enlarged image display unit Z, and the corner corresponding to the enlarged identification image C can be moved (position adjustment) up / down / left / right. It is shown that. Further, a message “Please make adjustments” is written in the message part Mb, prompting the user to adjust the position of the corners. In a state in which the corner adjustment image Pz is displayed, the user can adjust the position of the corner by operating the direction key.

In step ST15 of FIG. 5, the control unit 20 determines whether or not the direction key has been operated by the user. If the direction key has not been operated, the process proceeds to step ST17, and if the direction key has been operated. Moves to step ST16.
In step ST16, the control unit 20 newly selects another identification image C arranged in the direction of the operated direction key, and returns to step ST14. As a result, the newly selected identification image C is displayed in the selected color scheme in the corner selection image Ps, and the identification image C that has been selected so far is displayed in the non-selected color scheme.
In step ST17, the control unit 20 determines whether or not the determination key has been operated by the user. If the determination key has not been operated, the process proceeds to step ST18. If the determination key has been operated, The process proceeds to step ST20.

In step ST18, the control unit 20 determines whether or not the cancel key has been operated by the user. If the cancel key has not been operated, the process returns to step ST15. If the cancel key has been operated, the process returns to step ST19. Transition.
In step ST19, the control unit 20 instructs the OSD processing unit 25 to end the superimposed display of the corner selection image Ps, and ends this processing.

  In step ST20, the control unit 20 instructs the OSD processing unit 25 to superimpose and display the corner adjustment image Pz (see FIG. 7B) instead of the corner selection image Ps.

Subsequently, the control unit 20 determines whether or not the direction key is operated in step ST21. If the direction key is operated, the process proceeds to step ST22. If the direction key is not operated, step ST23 is performed. Migrate to
In step ST22, the control unit 20 instructs the image correction unit 26 to move the selected corner in the direction of the operated direction key, and returns to step ST20. For example, when the identification image C1 is selected in the corner selection image Ps, that is, when the upper left corner is selected, the image correction unit 26, as shown in FIG. 8, the upper left corner of the image forming area 12e. The unit is moved by a predetermined amount in the direction of the operated direction key. Thereafter, the image correcting unit 26 corrects the image information so that the input image Pi is formed in the image forming region 12e having a new shape after the corner portion is moved. If the user repeatedly operates or presses the direction key, steps ST21 and ST22 are repeatedly executed, and the selected corner can be moved by a necessary amount.
Note that the relationship between the up / down / left / right direction of the projected input image Pi and the top / bottom / left / right direction of the liquid crystal light valve 12 does not always match. The corners of the image forming area 12e are moved so as to move.

  Further, since the corner of the image forming area 12e cannot move to the outside of the pixel area 12a, the corner is located on the outer edge (boundary) of the pixel area 12a, that is, at the limit of the movable range. The control unit 20 ignores the operation of the direction key in the direction toward the outside of the pixel region 12a. Further, when the corner portion is located on the outer edge of the pixel region 12a, the control unit 20 instructs the OSD processing unit 25 to notify the user that it cannot move in the outer direction. Thus, the color of the direction mark D in the direction toward the outside of the pixel region 12a, that is, the direction incapable of moving, is less conspicuous than the color of the direction mark D in another direction (for example, a bright color such as orange) (for example, , Dark color such as gray). For example, as shown in FIGS. 8A, 8 </ b> B, and 8 </ b> C, when the corner to be moved is located at the upper end of the pixel area 12 a, the upward direction mark D is inconspicuous. When the up direction key is operated, the operation is ignored. Further, as shown in FIGS. 8A, 8D, and 8G, when the corner to be moved is located at the left end of the pixel region 12a, the left direction mark D is inconspicuous. When the left direction key is operated, the operation is ignored. The reason why the corner adjustment image Pz is displayed again after returning to step ST20 after step ST22 is to update the color of the direction mark D according to the situation. The limit of the movable range may be set not only on the outer edge of the pixel region 12a but also in the direction inside the pixel region 12a.

  In step ST23 of FIG. 5, the control unit 20 determines whether or not the enter key or the cancel key is operated. If neither the enter key nor the cancel key is operated, the control unit 20 returns to step ST21. On the other hand, when either the enter key or the cancel key is operated, the movement of the selected corner is completed and the process returns to step ST14 to return to the state where the corner selection image Ps is displayed. Thereafter, the user can select another corner and continue the adjustment, or can operate the cancel key to end the process.

  Then, as illustrated in FIGS. 8A to 8I, the image correction unit 26 deforms the image forming area 12e on the liquid crystal light valve 12 to form the input image Pi, thereby projecting the projection surface S. The upper projection image Ao is deformed to correct the trapezoidal distortion as shown in FIG. Therefore, in the projector 1, the corner selection image Ps and the corner adjustment image Pz are displayed according to the operation of the keystone distortion correction key, the direction key, the determination key, and the cancel key, and an operation for correcting the keystone distortion can be performed. .

FIG. 6 is a flowchart showing in detail the pincushion distortion correction processing in step ST12 (FIG. 5).
When the pincushion distortion correction is instructed, the control unit 20 instructs the OSD processing unit 25 to superimpose and display the adjustment unit selection image Pu on the input image Pi in step ST31.

9 to 11 are diagrams showing images displayed at the time of executing the pincushion distortion correction, FIG. 9 is a diagram showing the adjustment unit selection image Pu, and FIG. 10 is a diagram showing the corner adjustment image Pv. FIG. 11 is a diagram showing the side adjustment image Pw.
The adjustment unit selection image Pu includes a title portion Tc, four identification images G1 to G4 corresponding to the four corners of the input image Pi, that is, the four corners of the image formation region 12e, and four identifications corresponding to the four sides of the image formation region 12e. It includes images G5 to G8, a message part Mc on which a message to the user is written, an operable operation key, and a key guide part Kc for guiding its operation.

  The identification images G1 to G8 correspond to the identification image G1 corresponding to the upper left corner of the image forming area 12e (input image Pi), the identification image G2 corresponding to the upper right corner, and the lower left corner, respectively. An identification image G3, an identification image G4 corresponding to the lower right corner, G5 corresponding to the upper side, G6 corresponding to the left side, G7 corresponding to the right side, and G8 corresponding to the lower side. Are all the same size. Each of the identification images G1 to G8 is arranged in a matrix of 3 rows and 3 columns with a central space, and is arranged at a corresponding position in the image forming region 12e. For example, the identification image G1 corresponding to the upper left corner is arranged at the upper left. Further, illustrations representing the corresponding corners and sides are drawn on the identification images G1 to G8, and the correspondence between the corners and sides of the image forming area 12e and the identification images G1 to G8 is shown by the user. Can be understood intuitively.

  In the title part Tc, “Pin-up distortion correction” is written so that it can be understood that the function is to correct the pincushion distortion. In the message part Mc, “Please select an area” is written and identified. The user is prompted to select any one corner by the images G1 to G8. One of the identification images G1 to G8 (identification image G1 in the example of FIG. 9) is surrounded by a frame of a color scheme different from the other three, and the identification image G is in a selected state. Show. Hereinafter, the color scheme of the selected identification image G is also referred to as “selected color scheme”, and the color scheme of the unselected identification image G is also referred to as “non-selected color scheme”. The user can select a desired identification image G by operating the direction key. When the determination key is operated after selecting the identification image G, the selection of the identification image G is confirmed.

Further, as shown in FIG. 10, the corner adjustment image Pv includes a title portion Td, an enlarged image display portion V, a message portion Md where a message to the user is written, operable operation keys, and guidance thereof. The title guide Td is described as “cushion distortion correction” in the title part Td, like the title part Tc of the adjustment part selection image Pu. The corner adjustment image Pv is displayed when any of the identification images G1 to G4 corresponding to the corners is selected in the adjustment unit selection image Pu of FIG.
In the enlarged image display unit V, one identification image G (identification image G1 in the example of FIG. 10) selected by the adjustment unit selection image Pu is displayed in an enlarged manner, and the three identification images G that have not been selected are displayed. (G2 to G4 in the example of FIG. 10) is not displayed. In addition, a triangular direction mark D indicating the up, down, left, and right directions is added to the enlarged image display portion V, and the corner corresponding to the enlarged identification image G can be moved up, down, left, and right (position adjustment). It is shown that. Further, a message “Please make adjustments” is written in the message part Md, prompting the user to adjust the position of the corners. In a state where the corner adjustment image Pv is displayed, the user can adjust the position of the corner by operating the direction key.

Here, when any one of the identification images G5 to G8 corresponding to the side is selected in the adjustment unit selection image Pu (FIG. 9), the side adjustment image Pw shown in FIG. 11 is displayed instead of the corner adjustment image Pv. Is done. The side adjustment image Pw includes a title portion Td, an enlarged image display portion V, a message portion Md in which a message to the user is written, and an operable operation key and a key guide portion for guiding the operation thereof. In the enlarged image display portion V, the identification image G (identification image G5 in the example of FIG. 11) corresponding to any side of the image forming area 12e selected by the adjustment portion selection image Pu is included in the enlarged image display portion V. It is enlarged. In the side adjustment image Pw, the identification images G (G6 to G8 in the example of FIG. 11) corresponding to the three sides not selected are not displayed.
Similar to the corner adjustment image Pv, a triangular direction mark D indicating the up / down / left / right direction is added to the enlarged image display portion V. However, since the side of the image forming area 12e can be adjusted only in the vertical direction, two direction marks D indicating two directions are added to the side adjusted image Pw. When the identification images G5 and G8 corresponding to the upper side and the lower side are selected, two direction marks D indicating the vertical direction are added to the side adjustment image Pw, and the identification images G6 and G7 corresponding to the left side and the right side are selected. In such a case, two direction marks D indicating the left and right direction are added.
These direction marks D indicate that the side corresponding to the enlarged identification image G can be moved (position adjustment) vertically or horizontally.

  Here, FIGS. 12 to 14 show how the image forming region 12e is deformed in response to the operations in the corner adjustment image Pv and the side adjustment image Pw. 12A to 12I are explanatory diagrams for explaining the movement of the corners of the image forming region 12e. FIGS. 13A to 13C and FIGS. (c) is an explanatory diagram for explaining the movement of the midpoint of the side of the image forming area 12e. Each of FIGS. 12 to 14 shows a pixel region 12 a of the liquid crystal light valve 12.

  FIG. 12 shows an operation for the identification image G1 corresponding to the upper left corner of the image forming area 12e as an example. As shown in FIG. 12, when the direction key is operated in a state where the corner adjustment image Pv is displayed, the corner corresponding to the identification image G displayed on the enlarged image display unit V in response to this operation is The image forming area 12e is deformed so as to move vertically and horizontally. For example, when the up direction key is operated in the state of FIG. 12E, the corner of the image forming area 12e is moved up one step. Along with the movement of the corner, a side connecting to the corner, that is, a curve constituting the outline of the image forming area 12e is deformed, and the image forming area 12e has a shape shown in FIG. The change in the curve accompanying the movement of the corner is processed by the control unit 20 according to a preset algorithm. When the direction key indicating the downward direction is operated in the state of FIG. 12E, the corner of the image forming area 12e is moved down by one step, and the image forming area 12e is shown in FIG. It is deformed as follows. Similarly, when the direction key indicating the right direction is operated, the image forming area 12e is deformed as shown in FIG. 12F, and when the direction key indicating the left direction is operated, the image forming area 12e is changed to FIG. It is deformed as shown in (d). In this way, the distortion can be corrected by deforming the image forming region 12e by operating the direction mark D.

  Further, since the corner of the image forming area 12e cannot move to the outside of the pixel area 12a, the corner is located on the outer edge (boundary) of the pixel area 12a, that is, at the limit of the movable range. The control unit 20 ignores the operation of the direction key in the direction toward the outside of the pixel region 12a. Further, when the corner portion is located on the outer edge of the pixel region 12a, the control unit 20 instructs the OSD processing unit 25 to notify the user that it cannot move in the outer direction. Thus, the color of the direction mark D in the direction toward the outside of the pixel region 12a, that is, the direction incapable of moving, is less conspicuous than the color of the direction mark D in another direction (for example, a bright color such as orange) (for example, , Dark color such as gray). For example, as illustrated in FIGS. 12A, 12 </ b> B, and 12 </ b> C, when the corner to be moved is located at the upper end of the pixel region 12 a, the upward direction mark D is not conspicuous. When displayed in color and the up direction key is operated, the operation is ignored. Also, as shown in FIGS. 12A, 12D, and 12G, when the corner to be moved is located at the left end of the pixel region 12a, the left direction mark D is inconspicuous. When the left direction key is operated, the operation is ignored.

  By the way, the identification images G1 to G8 illustrated in FIG. 12 show examples in which each side of the image forming region 12e is deformed so as to be convex inward, but FIGS. 4 (a) to (h). As shown in FIG. 4, when the pincushion distortion occurs, each side of the projection image Ao may be convex outward or inward in the projection image Ao. For this reason, for example, when an operation for moving the upper side of the image forming area 12e further upward is performed from the state shown in FIG. An operation for reducing the image forming area 12e in the pixel area 12a may be guided. Alternatively, an operation for shifting the image forming area 12e in the pixel area 12a to the side opposite to the side that reaches the end of the pixel area 12a may be guided. In addition to guiding these operations, the image forming area 12e may actually be reduced or shifted. In this case, the range in which the pincushion distortion can be corrected with respect to the projection image Ao on the projection surface S is expanded.

  FIG. 13 is an explanatory diagram regarding the movement of the midpoint of the horizontal side of the image forming area 12e, and shows an example of an operation on the identification image G5 corresponding to the upper side of the image forming area 12e. As shown in FIG. 13, when the direction key is operated while the side adjustment image Pw is displayed, the side corresponding to the identification image G displayed on the enlarged image display unit V in accordance with this operation is The image forming area 12e is deformed so as to move to. Here, the entire side is not moved, but the midpoint of the side is moved up and down, and the side is deformed in accordance with the movement of the midpoint. The change in the side is determined by performing calculation processing for drawing a curve in accordance with the position of the moved middle point according to a preset algorithm by the control unit 20. For example, when the direction key indicating the upward direction is operated in the state of FIG. 13B, the center of the side of the image forming area 12e is moved up by one step, and this side, that is, the image forming area is accompanied by this movement. The curve constituting the contour of 12e is deformed as shown in FIG. When the direction key indicating the downward direction is operated in the state of FIG. 13B, the corner of the image forming area 12e is moved down by one step, and the image forming area 12e is moved as shown in FIG. 13C. Deformed. Here, the control unit 20 moves the center of the side as the predetermined position, but may move other positions. However, since the normal image forming area 12e is rectangular, moving the center of the side is suitable for correcting the pincushion distortion.

FIG. 14 is an explanatory diagram relating to the movement of the midpoint of the vertical side of the image forming area 12e, and shows an operation for the identification image G6 corresponding to the left side of the image forming area 12e as an example. As shown in FIG. 14, when the direction key is operated while the side adjustment image Pw is displayed, the side corresponding to the identification image G displayed on the enlarged image display unit V in response to this operation is The image forming area 12e is deformed so as to move to. Similar to the case described with reference to FIG. 13, the entire side is not moved according to the operation of the direction mark D, but the middle point of the side is moved up and down. The edge is deformed. The change in the side is determined by performing calculation processing for drawing a curve in accordance with the position of the moved middle point according to a preset algorithm by the control unit 20.
For example, when the direction key indicating the left direction is operated in the state of FIG. 14B, the center of the side of the image forming area 12e is moved to the left by one step, and this side, that is, the image forming area is accompanied with this movement. The curve constituting the contour of 12e is deformed as shown in FIG. When the direction key indicating the right direction is operated in the state of FIG. 13B, the corner of the image forming area 12e is moved to the right by one step, and the image forming area 12e is moved to the right as shown in FIG. Deformed.

In step ST32 of FIG. 6, the control unit 20 determines whether or not the direction key has been operated by the user. If the direction key has not been operated, the process proceeds to step ST34, and if the direction key has been operated. Moves to step ST33.
In step ST33, the control unit 20 newly selects another identification image G arranged in the direction of the operated direction key, and returns to step ST31. Accordingly, the newly selected identification image G is displayed in the selected color scheme on the adjustment unit selection image Pu, and the identification image G that has been selected so far is displayed in the non-selected color scheme.
In step ST34, the control unit 20 determines whether or not the determination key is operated by the user. If the determination key is not operated, the control unit 20 proceeds to step ST35, and if the determination key is operated, The process proceeds to step ST37.

In step ST35, the control unit 20 determines whether or not the cancel key has been operated by the user. If the cancel key has not been operated, the process returns to step ST32. If the cancel key has been operated, the process returns to step ST36. Transition.
In step ST36, the control unit 20 instructs the OSD processing unit 25 to end the superimposed display of the adjustment unit selection image Pu, and ends this processing.

  In step ST37, the control unit 20 instructs the OSD processing unit 25 to display the corner adjustment image Pv or the side adjustment image Pw in place of the adjustment unit selection image Pu. Whether to display the corner adjustment image Pv or the side adjustment image Pw is determined by the control unit 20 according to the operation in step ST32.

Subsequently, the control unit 20 determines whether or not the direction key is operated in step ST38. If the direction key is operated, the process proceeds to step ST39. If the direction key is not operated, step ST40 is performed. Migrate to
In step ST39, the control unit 20 instructs the image correction unit 26 to move the corners or sides enlarged in the corner adjustment image Pv or the side adjustment image Pw in the direction of the operated direction key. Then, the process returns to step ST37. As described with reference to FIGS. 12 to 14, the image correction unit 26 moves the corner or side center of the image forming region 12 e by a predetermined amount in the direction of the operated direction key. Thereafter, the image correcting unit 26 corrects the image information so that the input image Pi is formed in the image forming region 12e having a new shape after the corner or the center of the side is moved. If the user repeatedly operates or presses the direction key, steps ST38 and ST39 are repeatedly executed, and the selected corner or side can be moved by a necessary amount.

Note that the relationship between the up / down / left / right direction of the projected input image Pi and the top / bottom / left / right direction of the liquid crystal light valve 12 does not necessarily match, but in this case, the corner of the projected input image Pi is in the operated direction. The corners of the image forming area 12e are moved so as to move.
The reason why the corner adjustment image Pv is displayed again after returning to step ST37 after step ST39 is to update the color of the direction mark D according to the situation. The limit of the movable range may be set not only on the outer edge of the pixel region 12a but also in the direction inside the pixel region 12a.

  In step ST40, the control unit 20 determines whether or not the enter key or the cancel key is operated. If neither the enter key nor the cancel key is operated, the control unit 20 returns to step ST38. On the other hand, if either the enter key or the cancel key is operated, the movement of the selected corner is completed and the process returns to step ST31 to return to the state in which the adjustment part selection image Pu is displayed. Thereafter, the user can select another corner and continue the adjustment, or can operate the cancel key to end the process.

Next, a specific procedure for correcting the pincushion distortion shown in FIG. 4 according to the above-described flow will be described.
FIGS. 15 and 16 are explanatory views for explaining a correction procedure for pincushion distortion, and FIGS. 15A to 15G are front views showing the projection surface S, and FIGS. () Is a diagram showing a pixel region 12 a of the liquid crystal light valve 12.
When the user operates the pincushion distortion correction key in a state where the pincushion distortion is generated in the input image Pi projected on the projection surface S, the control unit 20 starts an operation according to the flow shown in FIG. As shown in FIG. 15A, the adjustment unit selection image Pu is superimposed and displayed on the input image Pi (step ST31).

The user operates the direction key as necessary (step ST32), and first selects the identification image G1 corresponding to the upper left corner (step ST33). When the user operates the enter key (step ST34), the control unit 20 displays the corner adjustment image Pv superimposed on the input image Pi as shown in FIG. 15B (step ST37), and the enlarged image. The identification image G1 is enlarged and displayed on the display unit V.
When the corner adjustment image Pv is displayed, the user can move the corner of the image forming area 12e (input image Pi) by operating the direction key, and the user can move the selected upper left corner to the upper left. In order to move in this direction, the left and up keys are appropriately operated (step ST38). As shown in FIG. 12, the upper left corner of the image forming area 12e moves by a predetermined amount in the left direction every time the left direction key is operated, and is located in the upward direction every time the up direction key is operated. It moves by fixed amount (step ST39). Then, the user moves the upper left corner of the image forming region 12e to the upper left by a necessary amount while viewing the input image Pi projected on the projection surface S (see FIG. 15C) (FIG. 15D). )reference). As a result, the image forming area 12e formed on the liquid crystal light valve 12 is deformed so that the upper left corner moves to the upper left as shown in FIG. Thereafter, when the user operates the enter key or the cancel key (step ST40), the movement of the upper left corner is completed, and the state returns to the state where the adjustment unit selection image Pu is displayed (step ST31).

Next, the user operates the direction key as necessary (step ST32), and this time selects the identification image G5 corresponding to the upper side (step ST33). When the user operates the enter key (step ST34), the control unit 20 displays the side adjustment image Pw superimposed on the input image Pi as shown in FIG. 15E (step ST37), and the enlarged image. The identification image G5 is enlarged and displayed on the display unit V.
When the side adjustment image Pw is displayed, the user appropriately operates the up direction key while looking at the input image Pi (see FIG. 15F) projected on the projection surface S (step ST38) to form an image. The upper side of the region 12e is moved up by a necessary amount. As a result, the image forming area 12e formed on the liquid crystal light valve 12 is deformed so that the upper side moves upward as shown in FIG. When the user operates the enter key or the cancel key (step ST40), the movement of the upper side is completed, and the state returns to the state where the adjustment unit selection image Pu is displayed (step ST31). Thereafter, when the user operates the cancel key (step ST35), the superimposed display of the adjustment unit selection image Pu ends (step ST36), and the input image Pi is displayed with the pincushion distortion eliminated.

  As described above, in the projector 1, the adjustment unit selection image Pu, the corner adjustment image Pv, and the edge adjustment image Pw are displayed according to the operations of the pincushion distortion correction key, the direction key, the enter key, and the cancel key, and the pincushion distortion is reduced. A correction operation can be performed.

  As described above, according to the projector 1 of the present embodiment, the light source 11, the liquid crystal light valve 12 that modulates the light emitted from the light source 11, and the projection that projects the image light modulated by the liquid crystal light valve 12. The projection optical system including the lens 13 is provided, and the control unit 20 includes eight identification images G1 to G8 respectively corresponding to the corners of the four corners of the projection image Ao indicated by the image light and the four sides between the corners. Is displayed by the OSD processing unit 25 by projecting image light from the projection optical system, and an operation for selecting one of the displayed eight identification images G1 to G8 is received by the input operation unit 22, and this operation is performed. The identification image G selected in the above is highlighted so as to be distinguishable from other identification images G, and an operation for moving a predetermined position on the corner or side is input while the identification image G is displayed. Based on the accepted operation received by the cropping unit 22, the predetermined position on the corner or side corresponding to the selected identification image G is moved, and the pincushion distortion correction associated with this movement is executed by the image correction unit 26. Therefore, eight identification images G1 to G8 respectively corresponding to the four corners and four sides of the projection image Ao projected onto the projection surface S are displayed, and one of these identification images G1 to G8 is selected. Since the identification image G selected according to the operation is displayed and the pincushion distortion correction is performed based on the operation on the identification image G, an operation for performing the pincushion distortion correction can be easily performed.

  Further, the control unit 20 selects the direction mark D corresponding to at least two axes movable by the input operation unit 22 by the input operation unit 22 for the identification images G1 to G4 corresponding to the corners. For the identification images G5 to G8 that are added to the identification image G and correspond to the sides, the direction mark D corresponding to one axis that can be moved by the input operation unit 22 is selected by the input operation unit 22 Since it is added to the image G, it is possible to appropriately guide the operation by displaying the optimum direction mark D for each of the corner and the side, and to facilitate the operation for correcting the pincushion distortion. it can.

  In addition, the projector 1 is configured to be able to select a pincushion distortion correction mode for performing pincushion distortion correction and a trapezoidal distortion correction mode for performing trapezoidal distortion correction. The four identification images C1 to C4 respectively corresponding to the corners are displayed, and the input operation unit 22 receives an operation for selecting one of the four identification images C1 to C4 displayed by the control unit 20 and performs an input operation. The unit 22 receives an operation for moving the corner while the control unit 20 displays the identification image C, and the image correction unit 26 is selected based on the operation received by the input operation unit 22. Since the corner corresponding to the identified image C is moved and the trapezoidal distortion correction associated with the movement is executed, the operation for correcting the trapezoidal distortion can be easily performed together with the pincushion distortion correction.

Further, the control unit 20 hides the seven other identification images G that were not selected by the input operation unit 22 in the pincushion distortion correction mode, and 3 that was not selected by the input operation unit 22 in the trapezoidal distortion correction mode. Since two other identification images C are not displayed, the optimum display can be performed for each of the pincushion distortion correction and the trapezoidal distortion correction, and the operation can be facilitated.
In a state where the predetermined position on the corner or side selected by the input operation unit 22 is located at the limit of the movable range and cannot move in the predetermined direction, the control unit 20 has a direction mark D corresponding to the direction. Since the limit of the operation of moving the corner or side can be notified by the display state of the direction mark D, the operation for correcting the pincushion distortion can be made easier.

  In addition, the said embodiment is only an example of the specific aspect to which this invention is applied, This invention is not limited, It is also possible to apply this invention as an aspect different from the said embodiment. For example, in the above embodiment, the identification image C selected by the corner selection image Ps and the identification image G corresponding to the corner or side selected by the adjustment unit selection image Pu are used as the corner adjustment image Pz and the corner adjustment. It is displayed on the image Pv or the side adjustment image Pw. That is, the other identification images C and G that have not been selected are not displayed. For example, if the size is smaller than the selected identification images C and G, a part of the identification images C and G that have not been selected. Alternatively, all may be included in the corner adjustment image Pz, the corner adjustment image Pv, and the side adjustment image Pw. Further, in the corner adjustment image Pz, the corner adjustment image Pv, and the side adjustment image Pw, it is not always necessary to enlarge the selected identification images C and G, and the identification images C and G that have not been selected are reduced or hidden. Or just do it. As described above, the corner adjustment image Pz, the corner adjustment image Pv, and the side adjustment image Pw are displayed in a manner that emphasizes and displays the selected identification images C and G over the identification images C and G that are not selected. Good.

  Moreover, in the said embodiment, while making the color of the direction mark D of the direction which cannot be moved inconspicuous color in the corner adjustment image Pz, the corner adjustment image Pv, and the edge adjustment image Pw, the direction key of the direction is operated. However, this operation is ignored, but when a direction key in a direction that cannot be moved is operated, a message notifying that the movement is not possible may be displayed on the message parts Mb, Md, and the like.

In the above embodiment, if it is possible to identify whether or not the position adjustment of each corner and side has been completed on the adjustment unit selection image Pu, it becomes easier to grasp the implementation status of the position adjustment and the convenience is improved. . For example, when the movement of the corners or sides (position adjustment) is completed, an adjusted mark indicating that the position adjustment has been completed may be added to the identification image G in the adjustment unit selection image Pu. Alternatively, the color scheme of the identification image C whose position has been adjusted may be changed.
In the above embodiment, when a direction key is operated while the corner adjustment image Pv or the side adjustment image Pw is displayed, the color of the corresponding direction mark D is temporarily changed in conjunction with the operation. It may be changed. According to this, since the color of the direction mark D changes every time the direction key is operated, the user can recognize that the operation of the direction key is normally received.

In the above embodiment, the three-plate projector 1 using the three liquid crystal light valves 12R, 12G, and 12B as the light modulation device has been described. However, the aspect of the light modulation device is not limited to this. For example, a method using a single transmissive or reflective liquid crystal panel and a color wheel, a method using three digital mirror devices (DMD), a DMD method using one digital mirror device and a color wheel, etc. It may be configured. Here, when only one liquid crystal panel or DMD is used as the display unit, a member corresponding to a synthetic optical system such as a cross dichroic prism is unnecessary. In addition to the liquid crystal panel and DMD, any configuration that can modulate the light emitted from the light source can be used without any problem.
In the above embodiment, the light source 11 is configured by the discharge-type light source lamp 11a, but a solid light source such as an LED light source or other light sources can also be used.

  Further, each functional unit of the projector 1 illustrated in FIG. 1 indicates a functional configuration realized by cooperation of hardware and software, and a specific mounting form is not particularly limited. Therefore, it is not always necessary to mount hardware corresponding to each function unit individually, and it is of course possible to realize a function of a plurality of function units by one processor executing a program. In addition, in the above embodiment, a part of the function realized by software may be realized by hardware, or a part of the function realized by hardware may be realized by software. In addition, the specific detailed configuration of each other part of the projector 1 can be arbitrarily changed without departing from the gist of the present invention.

  DESCRIPTION OF SYMBOLS 1 ... Projector, 10 ... Image projection part, 11 ... Light source, 12 ... Liquid crystal light valve (light modulation apparatus), 12a ... Pixel area, 12e ... Image formation area, 12p ... Pixel, 13 ... Projection lens (projection optical system), DESCRIPTION OF SYMBOLS 14 ... Light modulation apparatus drive part, 20 ... Control part (identification image display part, highlight display part), 21 ... Memory | storage part, 22 ... Input operation part (selection operation part, movement operation part), 25 ... OSD process part (identification) Image display unit, highlight display unit) 26 ... image correction unit, Ao ... projection image, C1-C4 ... identification image, D ... direction mark, G1-G8 ... identification image, Ka, Kb, Kc, Kd ... key guidance unit , Ma, Mb, Mc, Md ... Message part, Pi ... Input image, Ps ... Corner selection image, Pu ... Adjustment part selection image, Pv ... Corner adjustment image, Pw ... Side adjustment image, Pz ... Corner adjustment image, S ... Projection surface, Ta, T , Tc, Td ... title part, V, Z ... enlarged image display unit.

Claims (6)

A light source;
A light modulation device for modulating light emitted from the light source;
A projection optical system for projecting image light modulated by the light modulation device;
Identification images for displaying eight identification images respectively corresponding to the corners of the four corners of the image indicated by the image light and the four sides between the corners by projecting the image light from the projection optical system A display unit;
A selection operation unit that receives an operation of selecting one of the eight identification images displayed by the identification image display unit;
A highlighting unit that highlights the identification image selected by the selection operation unit so as to be distinguishable from other identification images;
A movement operation unit that receives an operation for moving a predetermined position on the corner or the side in a state where the highlighting unit displays the identification image;
Based on the operation received by the moving operation unit, the predetermined position on the corner or the side corresponding to the identification image selected by the selection operation unit is moved, and the pincushion distortion correction associated with this movement is executed. An image correction unit to perform,
A projector characterized by comprising:   For the identification image corresponding to the corner portion, the highlight display unit selects the direction mark corresponding to at least two axes that can be moved by the movement operation unit by the selection operation unit. For the identification image corresponding to the side portion, a direction mark corresponding to one axis that can be moved by the movement operation unit is added to the identification image selected by the selection operation unit. The projector according to claim 1. A pincushion distortion correction mode for performing pincushion distortion correction and a trapezoidal distortion correction mode for performing trapezoidal distortion correction can be selected.
In the trapezoidal distortion correction mode,
The identification image display unit displays four identification images respectively corresponding to corners of the four corners of the image;
The selection operation unit receives an operation of selecting one of the four identification images displayed by the identification image display unit;
The movement operation unit accepts an operation for moving the corner in a state where the highlighting unit displays the identification image,
The image correction unit moves a corner corresponding to the identification image selected by the selection operation unit based on an operation received by the movement operation unit, and performs trapezoidal distortion correction associated with the movement. ,
The projector according to claim 1 or 2.   The highlighting unit hides the seven other identification images that were not selected by the selection operation unit in the pincushion distortion correction mode, and was not selected by the selection operation unit in the trapezoidal distortion correction mode. The projector according to claim 3, wherein the three other identification images are not displayed.   The highlighting unit corresponds to the direction when the predetermined position on the corner or the side selected by the selection operation unit is located at the limit of the movable range and cannot move in the predetermined direction. The projector according to claim 1, wherein the direction mark is inconspicuous. A method for controlling a projector that projects image light obtained by modulating light emitted from a light source,
Eight identification images corresponding to the corners of the four corners of the image indicated by the image light and the four sides between the corners are displayed by projecting the image light from the projection optical system,
Accepting an operation of selecting one of the eight identification images;
Highlight the selected identification image so that it can be distinguished from other identification images,
In a state where the identification image is highlighted, an operation for moving a predetermined position on the corner or the side is accepted,
Based on the received operation, moving the predetermined position on the corner or the side corresponding to the identification image selected by the selection operation unit, and executing a pincushion distortion correction associated with the movement,
A projector control method characterized by the above.

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