JP2014160155A - Projector and control method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correct pixel shift while properly grasping the effect of the correction.SOLUTION: A projector 1 includes: a liquid crystal drive unit 17 for modulating light emitted from a light source of a light source unit 13 by color; liquid crystal light bulbs 14R, 14G, 14B; a projection optical system 15 for combining the modulated light of colors and projecting it; a control unit 20 which outputs correction image data N for correcting pixel shift, including a pixel located at the outermost edge and a pixel inside the outermost edge defined as color-producing pixels (correction pixels), to the liquid crystal drive unit 17, to modulate the light; and an image processing unit 23.

Description

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

  2. Description of the Related Art Conventionally, in a projector (projection display device) that synthesizes and projects light of the three primary colors of red (R), green (G), and blue (B), a correction surface of two or more colors is projected onto a projection surface such as a screen. Is known that can correct the pixel shift of each color (so-called registration adjustment) using a correction image projected onto the projection surface (see, for example, Patent Document 1).

JP 2009-31442 A

A projector configured to correct a pixel shift using a correction image projected on the projection surface, such as the projector described above, can correct the pixel shift while accurately grasping the effect of the correction. Thus, there is a need to be able to correct pixel shift efficiently.
The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a projector capable of correcting pixel shift while accurately grasping the effect of correction, and a control method for the projector.

In order to achieve the above object, the present invention is a projector, wherein a projection for synthesizing and projecting light emitted from a light source for each color and light for each color modulated by the modulation unit. Correction image data for pixel shift correction in which the outermost pixel and the inner pixel on the outermost edge are used as correction pixels for forming an image used for correcting the pixel shift for each color. Control means for outputting to the modulation means and causing the modulation means to modulate light.
According to this configuration, since the image is projected on the outermost edge of the correction image projected on the projection surface such as the screen based on the correction image data, the image on the outermost edge of the correction image is used. Thus, it is possible to accurately correct the pixel shift at the outermost edge of the projection image of each color.
In addition, according to the above configuration, the following effects can be obtained.
That is, when correcting the pixel shift at the outer edge portion of the projection image using the correction image for one color and the correction image for another color, the outermost edge pixel of the correction image for the one color is placed outside. As a result, the correction of the pixel shift is performed, and the correction image data output to the modulation unit is corrected, and the pixel at the outermost edge of the one color correction image is projected onto the projection surface. It may disappear. Even in such a case, in the above configuration, since the pixel inside the outermost edge of the image data for correction is a correction pixel, the state where the pixel inside the outermost edge is projected onto the projection surface is maintained. Is done. Thus, when adjusting the pixel shift, it is possible to prevent the occurrence of a situation in which the pixels at the outer edge portion of the one color correction image are not projected and the correction effect cannot be grasped. It is possible to correct the pixel shift while accurately grasping the above.

In the invention, it is preferable that the correction image data is image data in which all of the outermost pixels and all of the pixels inside the outermost edge are the correction pixels.
According to this configuration, since a frame-like image is projected on the outermost edge of the correction image, it is possible to accurately correct the pixel shift of the outer edge portion for each color by comparing the frame-like images. In addition, since a frame-shaped image is also projected inside the outermost edge, even when a part of the outermost frame-shaped image is no longer projected due to correction of the correction image data. The state in which a part of the inner frame-like image is projected is maintained, and the pixel shift can be corrected while more accurately grasping the effect of the correction using the image.

Further, according to the present invention, the correction image data is image data in which a pixel relating to a correction point is formed at an outermost edge.
According to this configuration, when correcting the pixel shift at the outer edge portion of the projection image using the correction image for one color and the correction image for another color, the outermost edge of the correction image for the one color is used. Even when correction of pixel shift is performed such that the formed correction point is shifted outward, the state where the image formed at the corresponding position inside the outermost edge is projected on the projection surface is maintained, The pixel shift can be corrected while more accurately grasping the effect of the correction using the image.

Further, the present invention is characterized in that the correction image data is image data in which a pixel relating to a correction point is formed at an outermost edge and a corresponding position inside the outermost edge.
According to this configuration, when correcting the pixel shift at the outer edge portion of the projection image using the correction image for one color and the correction image for another color, the outermost edge of the correction image for the one color is used. Even when pixel deviation correction is performed such that the formed correction point is shifted outward, the state where the correction point formed at the corresponding position inside the outermost edge is projected onto the projection surface is maintained. The correction using the correction point can be performed. For this reason, it is possible to correct the pixel shift while more accurately grasping the correction effect.

The present invention further includes input means for inputting information for correcting pixel shift, and correction information storage means for storing correction information based on the information input by the input means, wherein the control means Is characterized in that, based on the correction information stored in the correction information storage means, the image data relating to the projection image is corrected and output to the modulation means, and the modulation means modulates the light.
According to this configuration, it is possible to project a projection image on a projection surface such as a screen, reflecting the correction of pixel shift using the correction image for each color.

In order to achieve the above object, the present invention is a projector, which projects light by combining light for each color modulated by the modulation means for modulating light emitted from a light source for each color. Storing correction image data for correcting pixel shift, in which the projection unit, the outermost pixel, and the innermost pixel are used as correction pixels for forming an image used for correcting the pixel shift. Storage means.
According to this configuration, when the correction image is projected based on the correction image data stored in the storage unit, the image is projected on the outermost edge of the correction image. By using this, it is possible to accurately correct the pixel shift at the outermost edge of each color projection image.
In addition, according to the above configuration, the following effects can be obtained.
That is, when correcting the pixel shift at the outer edge portion of the projection image using the correction image for one color and the correction image for another color, the outermost edge pixel of the correction image for the one color is placed outside. As a result, the correction of the pixel shift is performed, and the correction image data output to the modulation unit is corrected, and the pixel at the outermost edge of the one color correction image is projected onto the projection surface. It may disappear. Even in such a case, in the above configuration, since the pixel inside the outermost edge of the image data for correction is a correction pixel, the state where the pixel inside the outermost edge is projected onto the projection surface is maintained. Is done. Thus, when adjusting the pixel shift, it is possible to prevent the occurrence of a situation in which the pixels at the outer edge portion of the one color correction image are not projected and the correction effect cannot be grasped. It is possible to correct the pixel shift while accurately grasping the above.

In order to achieve the above object, the present invention provides a modulation unit that modulates light emitted from a light source for each color, and a projection unit that synthesizes and projects light for each color modulated by the modulation unit, A correction pixel for forming an image used for correction of pixel shift between the outermost pixel and the innermost pixel by the modulation unit for each color. The light emitted from the light source is modulated based on the correction image data for correcting pixel shift, and the light modulated by the modulation unit is projected by the projection unit.
According to this control method, since the image is projected on the outermost edge of the correction image projected on the projection surface such as the screen based on the correction image data, the outermost edge image of the correction image is used. Thus, it is possible to accurately correct the pixel shift at the outermost edge of the projection image of each color.
In addition, according to the above configuration, the following effects can be obtained.
That is, when correcting the pixel shift at the outer edge portion of the projection image using the correction image for one color and the correction image for another color, the outermost edge pixel of the correction image for the one color is placed outside. As a result, the correction of the pixel shift is performed, and the correction image data output to the modulation unit is corrected, and the pixel at the outermost edge of the one color correction image is projected onto the projection surface. It may disappear. Even in such a case, in the above configuration, since the pixel inside the outermost edge of the image data for correction is a correction pixel, the state where the pixel inside the outermost edge is projected onto the projection surface is maintained. Is done. Thus, when adjusting the pixel shift, it is possible to prevent the occurrence of a situation in which the pixels at the outer edge portion of the one color correction image are not projected and the correction effect cannot be grasped. It is possible to correct the pixel shift while accurately grasping the above.

  According to the present invention, it is an object to provide a projector capable of correcting pixel shift while accurately grasping the effect of correction, and a projector control method.

It is a block diagram which shows the functional structure of the projector which concerns on this embodiment. It is a figure which shows the conventional image for a correction | amendment. It is a figure which shows the image data for correction | amendment, and the image for correction | amendment. It is a figure which shows the image for a correction | amendment at the time of pixel shift correction | amendment. It is a flowchart which shows operation | movement of a projector. It is a figure which shows another example of the image data for correction | amendment. It is a figure which shows another example of the image data for correction | amendment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram illustrating a functional configuration of the projector 1 according to the first embodiment.
The projector 1 is connected to an external image supply device (not shown) such as a personal computer or various video players, and a projection image based on input image data D input from the image supply device is projected on a projection surface such as a screen SC. A device for projection. Examples of the image supply device include a video playback device, a DVD playback device, a TV tuner device, a CATV set top box, a video output device such as a video game device, and a personal computer. In the present embodiment, the screen SC is substantially upright, and the screen surface is rectangular.

The projector 1 includes a display unit 10 that roughly forms an optical image, and an image processing system 11 that electrically processes an image displayed by the display unit 10.
The display unit 10 includes a light source unit 13, three liquid crystal light valves 14R, 14G, and 14B corresponding to red (R), green (G), and blue (B), and a projection optical system 15. I have.
The light source unit 13 includes a light source having a xenon lamp, an ultrahigh pressure mercury lamp, an LED, and the like. Although not shown, an illumination optical system and a color separation optical system are provided between the light source unit 13 and the liquid crystal light valves 14R, 14G, and 14B. The illumination optical system collimates the light emitted from the light source unit 13, equalizes the illuminance of the light, aligns the light deflection direction in one direction, and outputs the light to the color separation optical system. The color separation optical system includes a reflection mirror and a dichroic mirror, and separates light input from the illumination optical system into three color lights of red (R), green (G), and blue (B), It outputs to the corresponding liquid crystal light valves 14R, 14G, or 14B.
The liquid crystal light valves 14R, 14G, and 14B are driven by a liquid crystal driving unit 17 to be described later, and modulate the input light by changing the light transmittance in each pixel arranged in a matrix, and output the light. To do. The lights modulated by the liquid crystal light valves 14R, 14G, and 14B are combined by a cross dichroic prism (not shown) and output to the projection optical system 15. In the present embodiment, the liquid crystal light valves 14R, 14G, and 14B and the liquid crystal driving unit 17 cooperate to function as “modulation means”.
The projection optical system 15 includes a zoom lens that performs enlargement / reduction of a projected image and a focus adjustment, a zoom adjustment motor that adjusts the degree of zoom, a focus adjustment motor that performs focus adjustment, and the like. The projection optical system 15 forms an image by projecting light input from the cross dichroic prism onto the screen SC using a zoom lens. In the present embodiment, the projection optical system 15 and a mechanism associated with the projection optical system 15 function as a “projection unit”.

The image processing system 11 includes a control unit 20, an input unit 21, a storage unit 22, an image processing unit 23, a liquid crystal driving unit 17, and a light source control unit 26.
The control unit 20 includes a CPU, a ROM, a RAM, and the like, and controls each unit of the projector 1 in an integrated manner by reading and executing a control program stored in the ROM.
The input unit 21 is connected to a remote control light receiving unit that detects an operation on a remote controller for instruction input and an operation panel for instruction input provided in the projector, detects an instruction input to the remote control or the operation panel, and 20 is output.
The storage unit 22 includes a nonvolatile memory such as an EEPROM, and stores various data in a rewritable manner.
The image processing unit 23 includes an image signal processing unit 24 and a pixel shift correction unit 25 as functional blocks. The functions of these functional blocks are exhibited by the cooperation of hardware and software, such as the CPU reading and executing a corresponding program.
The image signal processing unit 24 acquires the input image data D input from the image supply device according to the control of the control unit 20, and the input image data D is an image size, a resolution, a still image or a moving image. If it is a moving image, an attribute such as a frame rate is determined. Next, the image signal processing unit 24 performs appropriate image processing based on the determination result, and based on the input image data D, the red component image data, the green component image data, and the blue component Generate image data. At that time, the image signal processing unit 24 performs resolution conversion processing when the resolution of the acquired input image data D is different from the resolution of the liquid crystal panels of the liquid crystal light valves 14R, 14G, and 14B. When zooming is instructed by operating the panel, enlargement / reduction processing is performed to generate image data of each color. In the present embodiment, image data refers to data in which dots are arranged in a matrix and holds color information as gradation values of a predetermined gradation at each dot.
Next, the image signal processing unit 24 outputs the image data of each color to the liquid crystal driving unit 17. The output of the image data to the liquid crystal drive unit 17 is performed via a dedicated buffer. In the present embodiment, the control unit 20 and the image processing unit 23 cooperate to function as a “control unit”.
The liquid crystal driving unit 17 performs drawing on the liquid crystal light valves 14R, 14G, and 14B of the corresponding colors based on the input image data of each color, and modulates the light transmitted through each valve.
The light source control unit 26 drives a light source included in the light source unit 13 according to the control of the control unit 20.

Now, the projector 1 according to the present embodiment forms a correction image of each color of red (R), green (G), and blue (B) on the screen SC, and uses this correction image for each color. It is the structure which can correct | amend the pixel shift (what is called registration adjustment) of the projection image which concerns on this.
Hereinafter, first, a problem in pixel shift correction using an existing correction image will be described, and then a correction image according to the present embodiment and correction image data that is original data of the correction image will be described with reference to a projector. This will be described together with the processing of No. 1.

FIG. 2A is a diagram schematically illustrating a correction image G1, which is an example of an existing correction image, in a mode suitable for explanation.
In the following description, the upper and lower sides and the left and right sides are based on the upper and lower sides and the left and right sides indicated by arrows in the drawings.
The correction image G1 in FIG. 2A represents a state in which all dots constituting original data (image data) are projected as pixels on a screen for a certain color. Further, in the correction image G1, a frame K represents the maximum area in which pixels can be projected on the screen based on the image data in relation to the resolution of the liquid crystal light valve.
Hereinafter, for convenience of description, pixels formed on the screen are expressed as “projection pixels”, and are clearly distinguished from dots of image data.

As shown in FIG. 2A, the correction image G1 has correction points P formed at intervals in the vertical and horizontal directions. In particular, in the correction image G1, the correction points P are also formed in the outermost edge region. Has been. As is well known, the correction point P is a point used for adjusting the pixel shift of each color. For example, when correcting a pixel shift, a correction image G1 related to red and a correction image G1 related to blue are projected at the same time, and one correction point P related to red and a blue corresponding to the point are related. Appropriate settings are made so that, after extracting the positional difference from one correction point P, image processing is performed to correct the image data so as to reduce the positional difference between the correction points P. Is made.
Regarding correction of pixel shift, the correction image G1 has the following problems.
In other words, it is assumed that, for a correction image G1 of a certain color, image processing for shifting all dots upward by one dot is performed on the original data of the image in order to correct the pixel shift. In this case, along with the image processing, the dots corresponding to the correction point P formed at the uppermost outer edge of the correction image G1 disappear from the original data, and as a result, based on the image data after the image processing. When the correction image G1 is projected onto the screen SC, the correction point P formed at the outermost edge in the upward direction is not projected onto the screen SC. In such a state, the position of the correction point P for one color and the correction point P for the other color cannot be compared at the outermost edge in the upper direction of the correction image G1, and the correction effect can be accurately determined. May not be able to grasp. In addition, as a result of image processing, the correction point P for one color formed on the outermost edge in the upward direction is not projected, so that a significant color change occurs at the outer edge, which can give the user a sense of incongruity. There is sex. More specifically, the correction point P related to one color and the correction point P related to another color are adjacent to each other at the outer edge in the upper direction. As a result of the image processing, the correction point P related to one color disappears, and only the correction point P related to the other color is projected, which may cause a significant color change at the outer edge. .
That is, in the correction image G1, when the image processing for changing the outermost correction point P (projection pixel) to the outside is performed on the original data of the image, the correction point P is not projected. As a result, there is a problem that the effect of the correction may not be accurately grasped.

FIG. 2B is a diagram illustrating a correction image G2 which is an example of an existing correction image. A correction image corresponding to the correction image G2 in FIG. 2B is employed in, for example, a projector disclosed in Japanese Unexamined Patent Application Publication No. 2009-31442.
As shown in FIG. 2B, in the correction image G2, the correction points P are not formed in the outermost edge area, and a plurality of correction points P are formed at intervals in the vertical and horizontal directions in the area excluding the outermost edge area. Has been. Due to such a configuration, the correction image G2 does not have a problem in the correction image G1 that the correction point P at the outermost edge accompanying the image processing related to the correction of pixel shift does not occur, but the correction image G2 for each color. Since the correction point P does not exist in the outermost edge region, there is a problem in that correction of the pixel shift of each color in the outer edge portion including the outermost edge region cannot be performed appropriately. In particular, the pixel shift of each color in the outer edge portion of the projection image may affect the visibility of the projection image, and there is a high need to be able to perform the pixel shift of each color in the outer edge portion for correction of the pixel shift. .

Based on the problems of the conventional correction image as described above, the projector 1 according to the present embodiment is configured to be able to project the correction image G3 for each color based on the correction image data N shown below. Yes.
FIG. 3A is a diagram schematically showing a state where the correction image data N according to the present embodiment is developed in a predetermined coordinate system in a mode suitable for explanation. As described above, since the image data is data in which each dot is arranged in a matrix on the data, by developing the correction image data N in the coordinate system, the coordinates of each dot of the image data are It is uniquely defined by the relative position from the position defined as the origin in the coordinate system.
The correction image data N in FIG. 3A is simplified and schematically represented for convenience of explanation. Specifically, 25 pieces of image data in the vertical direction and 25 in the horizontal direction are shown. Forty-three dots are represented as image data arranged in a matrix, and each dot is represented by a rectangular figure.
The correction image data N is generated in advance and stored in the storage unit 22 as shown in FIG. In the present embodiment, the storage unit 22 functions as a “storage unit” that stores the correction image data.
As shown in FIG. 3A, the correction image data N in FIG. 3A includes all the dots (pixels) at the outermost edge and all the dots (pixels) inside the outermost edge as color pixels. Has been. A color pixel is a dot whose tone value of the color component is not “0”. When one dot is a color pixel in the correction image data N, the color pixel is corrected based on the correction image data N. When the image G3 is projected, light is projected corresponding to the one dot, and a projection pixel is projected.
Further, as shown in FIG. 3A, the correction image data N has colored pixels arranged in a grid pattern with an interval of 5 dots in the vertical and horizontal directions from the outermost dot row. A correction point dot Q is formed at each intersection of a dot row extending in the vertical direction and a dot row extending in the left-right direction.
Particularly, in the correction image data N, the correction point dot Q is formed at the outermost edge, and the correction point dot Q is formed at a corresponding position inside the outermost edge. More specifically, among the correction point dots Q at the outermost edge, the correction point dots Q other than the four corners are formed at adjacent positions on the inner side. For example, referring to FIG. 3A, with respect to the correction point dot Qa at the outermost edge, correction point dots Qb are formed at adjacent positions (corresponding positions) on the inner side. Among the correction point dots Q at the outermost edge, the correction point dots Q are formed on three dots surrounding the dots for the correction point dots Q at the four corners. For example, referring to FIG. 3A, with respect to the correction point dot Qc at the outermost edge, correction point dots Q are formed at positions adjacent to the right, lower right, and downward directions. The correction point dot Q is a color pixel that corresponds to the correction point P of the correction image G3. In the example of FIG. 3A, the color pixels are drawn by distinguishing between the correction point dots Q and those that are not, but these may be dots having the same gradation value.

FIG. 3B is a diagram schematically showing a correction image G3 projected based on the correction image data N shown in FIG.
As shown in FIG. 3B, in the correction image G3, the outermost frame image F1 is projected on the outermost edge of the correction image data N in accordance with the outermost edge color pixel, and the correction image data The inner frame image F2 is projected on the inner side of the outermost edge in accordance with the color pixels inside the outermost edge of N. In addition, a grid-like image is formed in an area other than the outermost edge area of the correction image G3, and an intersection of a column of projection pixels extending in the vertical direction and a column of projection pixels extending in the horizontal direction is obtained. In each, a correction point P is formed.
Further, in the correction image G3, correction points P are formed at corresponding positions in the outermost frame image F1 and the inner frame image F2. In this respect, the correction image P is different from the correction image G2. ing.
In the present embodiment, the color image pixels are formed in the correction image data N in the manner shown in FIG. 3A, so that an image (outermost frame image F1, inner frame) used for pixel shift on the screen. The image F2 and the grid-like image) are formed. In this case, the coloring pixels in the correction image data N correspond to “correction pixels for forming an image used for correcting pixel shift”.
However, in the correction image data N, dots other than dots related to an image used for pixel shift (the outermost frame image F1, the inner frame image F2, and the grid image) are not necessarily the gradation of the color component. The value does not need to be “0” and may be a dot that can distinguish an image used for pixel shift and other images when visually recognized. Even in this case, in the correction image data N, dots for forming an image (outermost edge frame image F1, inner frame image F2, and grid-like image) used for pixel shift are “correction Corresponds to “pixel”.
Further, contrary to the present embodiment, on the screen, the outermost frame image F1, the inner frame image F2, and the part corresponding to the grid-like image are not projected, but the other parts are projected, A configuration in which correction of pixel shift may be performed using a portion where light is not projected is also possible. In this case, in the correction image data N, the dots corresponding to the outermost frame image F1, the inner frame image F2, and the lattice-shaped image and having the color component gradation value “0” are “ This corresponds to “correction pixel”.

In the projector 1 according to the present embodiment, the correction image data N having the above-described configuration is stored, and the correction image G3 is projected on the screen SC based on the data when correcting the pixel shift of each color. This solves a problem in correction of pixel shift using a conventional correction image.
Specifically, as shown in FIG. 3B, the correction point P is formed in the outermost edge region of the correction image G3. Due to such a configuration, when correcting the pixel shift using the correction image G3 for one color and the correction image G3 for another color, the correction points P formed in the outermost edge region of each image are compared. Based on the above, it is possible to accurately correct the pixel shift at the outer edge. This solves the problem related to the correction image G2 described above.

Further, as described below, the problem relating to the correction image G1 is solved. Hereinafter, the upper outer edge using the red correction image G3 (hereinafter referred to as “red correction image GR”) and the green correction image G3 (hereinafter referred to as “green correction image GG”). A description will be given of an example in which correction of a pixel shift of a portion is performed.
As an example, with respect to the projection image related to red and the projection image related to green, a pixel shift is generated such that the projection image related to red is positioned one pixel higher than the projection image related to green. And In such a case, when each of the red correction image GR and the green correction image GG is projected based on the correction image data N that has not been corrected, as shown in FIG. Each of the correction images G3 is projected in a state where the red correction image GR is positioned one pixel higher than the green correction image GG.
Here, in FIG. 4A, the line for one pixel at the outermost edge of the red correction image GR is defined as “first line”, and the line for one pixel at the outermost edge of the green correction image GG is defined as “second line”. A line for one pixel inside is called a “third line”.
In this example, in the first line, there is a pixel shift in which a red projection pixel can be formed but a green projection pixel cannot be formed. Therefore, as shown in FIG. 4A, the outermost frame image F1 of the red correction image GR, that is, a red image is projected on the first line. Further, an image obtained by combining the inner frame image F2 of the red correction image GR and the outermost frame image F1 of the green correction image GG, that is, a mixed color image of red and green, is projected onto the second line. Is done. Further, an inner frame image F2 of the green correction image GG, that is, a green image is projected on the third line.
Further, the correction point Pr1 is formed at the outermost edge of the red correction image GR, and the correction point Pr2 is formed inside thereof, while the correction point Pg1 of the outermost edge of the green correction image GG is formed, and It is assumed that the correction point Pg2 is formed inside, and the correction point Pr1 and the correction point Pg1 are corresponding correction points to be compared in the pixel shift correction. In this case, as shown in FIG. 4A, the correction point Pr1 of the red correction image GR is positioned on the first line, and the correction point Pr2 of the red correction image GR and the green correction image GG are positioned on the second line. The correction point Pg1 is positioned so as to overlap, and the correction point Pg2 of the green correction image GG is positioned on the third line.

Now, in the state of FIG. 4A, in order to correct the pixel shift, each dot of the green correction image data N (hereinafter referred to as “green correction image data NG”) is one dot upward. It is assumed that the correction for changing is performed and the green correction image GG is projected based on the corrected green correction image data NG.
In this case, as shown in FIG. 4B, the outermost frame image F1 of the red correction image GR, that is, a red image is continuously projected onto the first line. Also, an image obtained by combining the inner frame image F2 of the red correction image GR and the inner frame image F2 of the green correction image GG, that is, a mixed color image of red and green, is projected onto the second line. The For convenience of explanation, according to the correction of the green correction image data NG, the outermost frame image F1 disappears and the inner frame image F2 shifts upward by one pixel at the upper outer edge of the green correction image GG. Shall be. Further, no projection pixel is formed on the third line.
Further, regarding the correction point P, as shown in FIG. 4B, the correction point Pr1 of the red correction image GR is positioned on the first line, and the correction point Pr2 and the green correction of the red correction image GR are positioned on the second line. The correction point Pg2 of the work image GG is positioned so as to overlap.
Thus, according to the present embodiment, when the correction for shifting the green correction image GG upward by one dot is performed on the green correction image data NG, the correction point Pg1 disappears, while the correction point Pg2 Is projected onto the outermost edge of the frame K (the maximum region of the green projection image). For this reason, the effect of the correction can be accurately grasped through the comparison between the correction point Pg2 and the correction point Pr2 of the red correction image GR, and when further correction is necessary, the correction can be accurately performed.
Furthermore, according to the present embodiment, the outermost edge of the correction image data N and all the dots inside the outermost edge are colored pixels, so that the correction image G3 of each color has an outermost edge frame at the outermost edge. An image F1 is formed, and an inner frame image F2 is formed inside the image F1. For this reason, when correcting the pixel shift at the outer edge portion of the projection image of each color, not only the comparison of the correction points of each color, that is, the comparison between points, but also the comparison of the outermost frame image F1 of each color, that is, a line segment. Based on the comparison between the line segment and the line segment, the state of pixel shift can be accurately grasped, and appropriate correction can be performed. In particular, in the present embodiment, as described above, one side of the outermost frame image F1 of the correction image G1 for one color has disappeared from the screen SC as the correction image data is corrected by correcting the pixel shift. Even in such a case, the state where the corresponding one side of the inner frame image F2 is projected is maintained. Therefore, based on the comparison between the line using the corresponding one side of the inner frame image F2, the projection image It is possible to accurately grasp the state of pixel shift at the outer edge. Such an effect cannot be achieved with the correction images G1 and G2 described above.
Furthermore, according to the present embodiment, as is apparent from the comparison between FIG. 4A and FIG. 4B, when the pixel shift correction for one pixel as described with reference to FIG. 4 is performed. Even so, the state in which the image relating to the mixed color of red and green is projected in the second line is maintained. For this reason, a significant color change is suppressed before and after correction, and the user can be prevented from feeling uncomfortable.

Next, the operation of the projector 1 at the time of correcting the pixel shift will be described.
FIG. 5 is a flowchart showing the operation of the projector 1. The correction of the pixel shift is performed at the time of manufacturing the projector 1 or during maintenance after manufacturing.
Referring to FIG. 5, the control unit 20 of the projector 1 monitors whether or not there is an instruction to start correction of pixel shift (step SA1). The instruction can be performed via the above-described remote controller or the operation panel.
When there is an instruction to start correction of pixel shift (step SA1: YES), the control unit 20 accesses the storage unit 22 to acquire the correction image data N, and the image signal processing unit of the image processing unit 23 24 (step SA2).
The image signal processing unit 24 generates the correction image data N for each color based on the input correction image data N (step SA3), and outputs it to the liquid crystal drive unit 17 (step SA4). As a result, the light is modulated by the liquid crystal light valve based on the correction image data N for each color, and the correction image G3 for each color is projected onto the screen SC.
Next, the control unit 20 monitors whether or not there is an instruction to end correction of pixel shift (step SA6), and monitors whether or not there is an instruction to correct pixel shift (step SA5). When instructing correction of pixel shift, (1) designation of color, (2) designation of correction point, and (3) designation of adjustment direction and adjustment amount of designated correction point are performed. The projector 1 provides a user interface for making these designations. In the present embodiment, the input unit 21 and an input unit such as a remote controller or an operation panel cooperate to function as “input means” to which information for correcting pixel shift is input.
As described above, the user compares the correction points P of the correction images G3 for the respective colors, extracts the differences between the correction points P, and performs the above three specifications so that the differences are suppressed. When there is an instruction for correcting the pixel shift (step SA5: YES), the control unit 20 outputs the designation made in the instruction to the pixel shift correction unit 25 of the image processing unit 23 (step SA7).

Based on the input from the control unit 20, the pixel shift correction unit 25 performs the specified adjustment for the specified correction point P in the specified adjustment direction with respect to the correction image data N of the specified color. Correction is performed so as to change by the amount (step SA8). A program in which an algorithm related to image processing related to the correction is mounted is stored, and the dot corresponding to the correction point P in the correction image data N and the surrounding dots are corrected by the function of the program. After the vector is calculated, appropriate correction is performed.
Next, the pixel shift correction unit 25 outputs the corrected image data N for correction to the image signal processing unit 24 (step SA9). The image signal processing unit 24 outputs the input corrected image data N for correction to the liquid crystal driving unit 17 (step SA10). As a result, for the color designated for correction, light is modulated by the liquid crystal light valve based on the corrected image data N for correction, and the correction image G3 is projected onto the screen SC. After the processing in step SA10, the processing procedure returns to step SA5, and the control unit 20 monitors whether or not there has been an instruction for correcting pixel shift. That is, the user confirms the effect of the correction before instructing the end of the correction of the pixel shift, and performs the re-correction if the pixel shift has not been eliminated.
When the user gives an instruction to end correction of pixel shift (step SA6: YES), the control unit 20 acquires final correction information for the correction image data N for each color, and stores the storage unit 22. Is written in the correction information file 40 stored in (step SA11). The correction information is information necessary for performing image processing that reflects pixel shift correction performed by the user on the image data of each color generated based on the input image data D. In the present embodiment, the storage unit 22 functions as a “correction information storage unit” that stores correction information.
Next, the control unit 20 controls the image processing unit 23 to stop projecting the correction image G3 for each color (step SA12).

After the correction information is written in the correction information file 40 in this way, the projector 1 projects the projection image reflecting the correction of the pixel shift as follows.
That is, after the start of projection, the control unit 20 accesses the correction information file 40 in the storage unit 22, acquires the correction information written in the file, and outputs the correction information to the pixel shift correction unit 25. The pixel shift correction unit 25 corrects the image data for each color generated based on the input image data D for each color based on the correction information input from the control unit 20. The image signal processing unit 24 outputs the corrected image data of each color to the liquid crystal driving unit 17. As a result, the pixel shift is corrected for each color, and a projected image of each color is projected on the screen SC.

  It should be noted that the instruction for correcting the pixel shift by the user in step SA5 can be performed in various modes. For example, when a correction point is specified by the user, the specified correction point is clearly shown by surrounding the correction point specified on the screen SC with a frame or the like, so that the user can more smoothly correct the pixel shift. You may be able to perform.

As described above, the projector 1 according to this embodiment includes the liquid crystal light valves 14R, 14G, and 14B as the modulation means, the liquid crystal drive unit 17, and the projection optical system 15 as the projection means. . Then, the control unit 20 and the image processing unit 23 serving as the control means, for each color, a correction image for correcting pixel shift in which the outermost edge dot (pixel) and the innermost dot on the outermost edge are colored pixels. Based on the data N, the light emitted from the light source of the light source unit 13 is modulated by the modulating means.
According to this configuration, since the outermost frame image F1 is projected on the outermost edge of the correction image G3 projected on the screen SC based on the correction image data N, each color is projected using the image. It is possible to accurately correct the pixel shift at the outermost edge of the image.
In addition, according to the above configuration, the following effects can be obtained.
That is, when correcting the pixel shift at the outer edge portion of the projection image using the correction image G3 for one color and the correction image G3 for another color, the outermost edge of the correction image G3 for the one color is corrected. The pixel shift correction that shifts the projection pixel to the outside is performed, and accordingly, the correction image data N output to the modulation unit is corrected, and the projection pixel at the outermost edge of the correction image of the one color is corrected. May not be projected on the projection surface. Even in such a case, in the above configuration, since the dot inside the outermost edge of the correction image data N is a color pixel, the state where the pixel inside the outermost edge is projected onto the projection surface is maintained. Is done. As a result, it is possible to prevent the occurrence of a situation in which the pixels at the outer edge portion of the one color correction image G3 are not projected and the correction effect cannot be grasped when the pixel shift is adjusted. It is possible to correct the pixel shift while accurately grasping the effect.

In the present embodiment, the correction image data N is image data in which all the outermost dots (pixels) and all the dots inside the outermost edges are color pixels.
According to this configuration, since the frame-shaped outermost frame image F1 is projected on the outermost edge of the correction image G3, the correction of the pixel shift at the outermost edge is accurately performed for each color through the comparison with the outermost frame image F1. Can be done. In addition, since the frame-shaped inner frame image F2 is also projected inside the outermost edge, a part of the outermost frame image F1 is no longer projected along with the correction of the correction image data N. However, a state in which a part of the inner inner frame image F2 is projected is maintained, and the inner frame image F2 can be used to correct the pixel shift while more accurately grasping the effect of the correction. Become.

In this embodiment, the correction image data N is image data in which dots corresponding to the correction points P are formed at the outermost edge and corresponding positions inside the outermost edge.
According to this configuration, when correcting the pixel shift at the outer edge portion of the projection image using the correction image G3 for one color and the correction image G3 for another color, the correction image G3 for the one color is corrected. Even when the pixel shift correction is performed such that the correction point P formed at the outermost edge is shifted outward, the correction point P formed at the corresponding position inside the outermost edge is projected onto the screen SC. This state is maintained, and correction using the correction point P becomes possible. For this reason, it is possible to correct the pixel shift while more accurately grasping the correction effect.

In addition, the projector 1 according to this embodiment includes an input unit that receives information for correcting pixel shift, and a correction value storage unit (storage unit 22) that stores correction information based on information input by the input unit. And more. Then, the control unit 20 and the image processing unit 23 functioning as a control unit correct the image data of each color based on the input image data D based on the correction information stored in the storage unit 22 and output it to the modulation unit.
According to this configuration, it is possible to project a projection image on the screen SC, reflecting pixel shift correction using the correction image G3 for each color.

<Modification>
Next, modified examples of the correction image data N will be described with reference to FIGS.
As shown in FIG. 6A, for the correction image data N, all the dots on the outermost edge and on the inner side of the outermost edge are not colored pixels, but the outermost edge and the pixels on the innermost side of the outermost edge. Only the pixel corresponding to the correction point P may be a color pixel.
Further, as shown in FIG. 6B, for the correction image data N shown in FIG. 6A, the pixel corresponding to the correction point dot Q among the outermost edge and the inner pixels on the outermost edge is a color pixel. In addition, a pixel adjacent to the pixel that is the color pixel may be a color pixel.
Further, as shown in FIG. 6C, with respect to the correction image data N, the outermost edge, the inner side of the outermost edge, and all the pixels inside the outermost edge may be colored pixels. That is, the outermost edge and the plurality of columns including the inner side of the outermost edge may be color pixels.
Any of the correction image data N shown in FIGS. 6A to 6C has the same effect as that described in the above embodiment, and the correction images G1 and G2 described above. It is possible to solve the problems related to.
Further, when the correction point is in the outermost edge region, it is possible to correct the pixel shift in the outermost edge region by the correction point. Therefore, a configuration may be adopted in which correction points are not provided inside the outermost edge, but correction points are provided only in the outermost edge region. In particular, the configuration may be such that correction points are provided only at the four corners in the outermost edge region.
For example, as shown in FIG. 7A, in the outermost frame image F1, while providing correction points only at the four corners, no correction points are provided in the inner frame image F2, and the projected pixels extend vertically. A configuration in which a correction point is provided at an intersection with a projection pixel extending in the left-right direction may be employed.
Also, for example, as shown in FIG. 7B, in the outermost frame image F1, correction points are provided only at the four corners, while no correction points are provided in the inner frame image F2. A configuration that does not form an image may be used.
According to such a configuration, it is possible to accurately correct the pixel shift in the region corresponding to the outermost edge region using the correction points formed in the outermost edge region while exhibiting the various effects described above.

The above-described embodiment is merely an aspect of the present invention, and can be arbitrarily modified and applied within the scope of the present invention.
For example, in the above-described embodiment, the configuration using the liquid crystal light valves 14R, 14G, and 14B corresponding to each color of RGB as an example of the means for modulating the light emitted from the light source of the light source unit 13 has been described. However, the present invention is not limited to this. For example, a reflective liquid crystal panel may be used, or a configuration using three digital mirror devices (DMD) corresponding to RGB colors may be used. May be. Further, it may be a rear projection type projector that projects image light from the back side of the screen SC.
That is, the present invention can be widely applied to projectors that form images on the screen SC by arranging the pixels (projection pixels) of the respective colors on the screen SC.
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 part of the projector 1 can be arbitrarily changed without departing from the gist of the present invention.
Further, the control program stored in the storage unit 22 in the above-described embodiment may be downloaded from the other device connected to the projector 1 via the communication network and executed, or controlled to a portable recording medium. The program may be recorded, and each program may be read from the recording medium and executed.

  DESCRIPTION OF SYMBOLS 1 ... Projector, 14R, 14G, 14B ... Liquid crystal light valve (modulation means), 17 ... Liquid crystal drive part (modulation means), 20 ... Control part (control means), 22 ... Storage part (correction information storage means, storage means) , 23... Image processing unit (control means), 24... Image signal processing unit, 25... Pixel shift correction unit, 40.

Claims (7)

Modulation means for modulating light emitted from the light source for each color;
Projection means for synthesizing and projecting light for each color modulated by the modulation means;
For each color, the pixel at the outermost edge and the pixel inside the outermost edge are used as correction pixels for forming an image used for correcting the pixel shift. Control means for outputting to the means and causing the modulation means to modulate light;
A projector comprising: The correction image data is
2. The projector according to claim 1, wherein all of the pixels at the outermost edge and all of the pixels inside the outermost edge are the image data as the correction pixels. The correction image data is
The projector according to claim 1, wherein the projector is image data in which pixels related to a correction point are formed at an outermost edge. The correction image data is
The projector according to claim 1, wherein the projector is image data in which a pixel relating to a correction point is formed at a corresponding position inside the outermost edge and inside the outermost edge. Input means for inputting information for correcting pixel shift;
Correction information storage means for storing correction information based on the information input by the input means,
The control means includes
2. The image data relating to a projection image is corrected based on the correction information stored in the correction information storage means and output to the modulation means, and the modulation means modulates light. Thru | or 4. The projector in any one of 4. Modulation means for modulating light emitted from the light source for each color;
Projection means for synthesizing and projecting light for each color modulated by the modulation means;
Storage means for storing correction image data for pixel shift correction, in which the outermost pixel and the inner pixel on the outermost edge are correction pixels for forming an image used for correcting the pixel shift;
A projector comprising: Modulation means for modulating light emitted from the light source for each color;
A projection unit that synthesizes and projects the light of each color modulated by the modulation unit,
For each color,
Based on correction image data for pixel shift correction, in which the outermost pixel and the inner pixel on the outermost edge are used as correction pixels for forming an image used for correcting the pixel shift by the modulation unit. Modulating the light emitted by the light source,
A projector control method, wherein the light projected by the modulating means is projected by the projecting means.

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