JP4626277B2 - Projection apparatus, projection method, and program - Google Patents

Description

  The present invention relates to a projection apparatus, a projection method, and a program having an automatic trapezoidal correction function.

  In many projector apparatuses generally called data projectors, those equipped with an automatic keystone correction function are often used. This automatic trapezoidal correction function detects trapezoidal distortion caused by the installation position of the device, creates an image with distortion in the reverse direction in advance on the display element, and emits the optical image in the projected state. The rectangular image has the same correct aspect ratio as the original image.

As one method of detecting distortion caused by the installation position of the device, for example, an angle sensor is provided, the projection angle at the time of installation is detected, and the keystone correction in each of the horizontal and vertical directions of the image is performed based on the inclination angle of the screen set separately. A technology of a projector device for performing the above is considered. (For example, Patent Document 1)
JP 2001-339671 A

  In the automatic trapezoidal correction function described above, the automatic trapezoidal correction is not performed in comparison with the state where automatic keystone correction is not performed, in other words, when the display element (transmissive liquid crystal panel or micromirror element) for forming a light image is used over the entire surface. In the corrected state, the light image formed by the display element is reduced in at least one of the vertical and horizontal directions according to the degree of distortion generated, so that the area of the projected image is smaller. There was a bug that it was.

  The present invention has been made in view of the above circumstances, and the object of the present invention is to suppress the reduction of the projected image area as much as possible while executing the automatic trapezoidal correction process. It is an object to provide a projection device, a projection method, and a program that can be used.

  According to the first aspect of the present invention, there are provided projection means for projecting an image, a plurality of legs provided on the lower surface of the apparatus housing, the lengths of which can be individually adjusted, and the lengths of the legs. Based on the projection image range obtained by the detecting means, the leg driving means for changing the projection image range of the projection means by adjusting the movement, the detection means for detecting the projection image range on the projection target by the projection means, Control means for individually controlling the lengths of the plurality of legs by the leg driving means, and the projection so that the image range becomes a rectangle based on the projection image range varied by the control by the control means. And a trapezoid correcting means for changing the projected image by the means.

  According to a second aspect of the present invention, in the first aspect of the invention, the control means is configured so that the vertical component difference between the upper and lower end points of the projection image range is substantially equal to the vertical component difference between the lower and lower end points. The lengths of the plurality of leg portions are controlled to be individually adjusted and driven by the leg length adjusting means.

  According to a third aspect of the present invention, in the first aspect of the present invention, the control means is configured so that the horizontal component difference at the left end points of the projection image range is substantially equal to the horizontal component difference at the right end points. The lengths of the plurality of leg portions are controlled to be individually adjusted and driven by the leg length adjusting means.

  According to a fourth aspect of the present invention, there is provided a projection unit that projects an image, a plurality of legs that are provided on the lower surface of the apparatus housing, the lengths of which can be individually adjusted, and the lengths of the plurality of legs. And a detection method for detecting a projection image range on a projection target by the projection unit, wherein the projection unit includes a leg driving unit that adjusts the projection image range to vary the projection image range of the projection unit. A control step of individually controlling the lengths of the plurality of legs by the leg driving unit based on the projection image range obtained in the detection step, and a projection image range varied by the control in the control step And a trapezoid correction step of changing the projection image of the projection unit so that the image range is rectangular.

  According to a fifth aspect of the present invention, there is provided a projection unit that projects an image, a plurality of legs that are provided on a lower surface of the apparatus housing, the length of which can be individually adjusted, and the lengths of the plurality of legs are individually set. A program executed by a computer incorporated in a projection apparatus including a leg drive unit that adjusts and drives the projection image range of the projection unit, the projection image range on the projection target by the projection unit being A detection step for detecting, a control step for individually controlling the lengths of the plurality of leg portions by the leg driving unit based on the projection image range obtained in the detection step, and a variable by the control in this control step According to the present invention, the computer is caused to execute a trapezoid correction step of changing the projection image in the projection unit so that the image range becomes a rectangle based on the projection image range.

  According to the first aspect of the present invention, by changing the installation angle of the projection device, it is possible to minimize the reduction in the area of the projected image while executing the automatic trapezoidal correction process. It becomes.

  According to the second aspect of the invention, in addition to the effect of the first aspect of the invention, the keystone correction is made more accurately visually by performing a keystone correction process that emphasizes the horizontal direction of the projected image. A projection image can be obtained.

  According to the third aspect of the invention, in addition to the effect of the first aspect of the invention, the keystone correction is performed based on the degree of change of the left and right sides shorter than the upper and lower sides. Automatic correction processing can be completed.

  According to the fourth aspect of the present invention, by changing the installation angle of the projection device, it is possible to suppress the area of the projected image from being reduced as much as possible while executing the automatic trapezoidal correction process. It becomes.

  According to the fifth aspect of the present invention, by changing the installation angle of the projection device, it is possible to suppress the reduction of the projected image area as much as possible while executing the automatic trapezoidal correction process. It becomes.

  Hereinafter, an embodiment in which the present invention is applied to a projector apparatus will be described with reference to the drawings.

  FIG. 1 shows an external configuration of a projector apparatus 10 according to the embodiment. FIG. 1 (A) is mainly arranged on the front and top surfaces of the housing, and FIG. 1 (B) is arranged on the back and bottom surfaces of the housing. Indicates.

  As shown in FIG. 1A, a projection lens 12, a distance measuring sensor 13, and an Ir receiving unit 14 are disposed on the front surface of a rectangular parallelepiped main body casing 11.

  The projection lens 12 is for projecting a light image formed by a spatial light modulation element such as a micromirror element, which will be described later, onto an object such as a screen, and here, a focus position and a zoom position (projection angle of view). Is arbitrarily variable.

  The distance measuring sensor 13 is arranged in a direction orthogonal to each other so that one of the two pairs of phase difference sensors is in the horizontal direction and the other is in the vertical direction. The distance to the light / dark pattern is measured along a one-dimensional detection line.

  The Ir receiver 14 receives an infrared light (Ir) signal on which a key operation signal from a remote controller of the projector device 10 (not shown) is superimposed.

A switch unit 15 and a speaker 16 are disposed on the upper surface of the main body casing 11.
The switch unit 15 includes, for example, a power key, an AF / AK (Automatic Focus / Automatic Keystone correction) key, a zoom up / down key, a signal selection key, a volume up / down key, and the like. .

  The speaker 16 emits a sound of the input audio signal and a beep sound during operation.

As shown in FIG. 1B, an input / output connector portion 17, an Ir receiving portion 18, and an AC adapter connecting portion 19 are disposed on the back surface of the main body casing 11.
The input / output connector unit 17 includes, for example, a USB terminal for connection with an external device such as a personal computer, a mini D-SUB terminal for video input, an S terminal, an RCA terminal, a stereo mini terminal for audio input, and the like. Become.

Similar to the Ir receiver 14, the Ir receiver 18 receives an infrared light (Ir) signal on which a key operation signal from a remote controller (not shown) is superimposed.
The AC adapter connection unit 19 connects an AC cable from an AC adapter (not shown) serving as a power source.

  Further, adjustment legs 20 a to 20 d capable of height adjustment are attached to the lower surface of the main body casing 11 at the four corners. The lengths of these adjusting legs 20a, 20b, 20c, and 20d are individually adjusted as necessary by operating the AF / AK key on the keyboard unit 16.

  In the state of FIG. 1B, the pair of adjustment legs 20a and 20b positioned on the front side are adjusted slightly longer, and the pair of adjustment legs 20c and 20d positioned on the rear side are adjusted to the shortest state. Has been.

  Therefore, when the projector device 10 in this state is installed in a horizontal place, if the projection optical axis of the projection lens 12 is perpendicular to the mounting surface of the projection lens 12, the actual projection lens 12 This projection optical axis has a slight elevation angle, and is emitted toward a screen (not shown) to be projected, slightly upward.

  Therefore, if the screen to be projected is stretched in the vertical direction, the distance from the projection lens 12 increases as it approaches the upper end of the screen. Therefore, when automatic keystone correction is not performed, a rectangular image is displayed. When projected, a trapezoidal image in which the upper base is longer than the lower base is projected and displayed on the screen.

  Next, the functional configuration of the electronic circuit of the projector apparatus 10 will be described with reference to FIG. In the figure, the image signals of various standards input from the input / output connector unit 17 are unified into image signals of a predetermined format by the image conversion unit 32 via the input / output interface (I / F) 31 and the system bus SB. Later, it is sent to the display encoder 33.

  The display encoder 33 develops and stores the transmitted image signal in the video RAM 34, generates a video signal from the stored contents of the video RAM 34, and outputs the video signal to the display driving unit 35.

  The display driving unit 35 is composed of, for example, a micromirror element at higher speed time division driving according to a frame rate, for example, 30 [frames / second] and the number of gradations in accordance with the transmitted image signal. A spatial light modulation element (SOM) 36 is driven for display. A high-intensity white light emitted from a light source lamp 38 such as an ultra-high pressure mercury lamp disposed in a reflector 37 is driven to the spatial light modulation element 36. By appropriately illuminating light through the color wheel 39 and irradiating it through the mirror 40, an optical image is formed by the reflected light, and is projected and displayed on a screen (not shown) through the projection lens 12. The

However, the projection lens 12 is driven by the lens motor (M) 41 to move the zoom position and the focus position as appropriate.
The control unit 42 controls all the operations of the circuits. The control unit 42 counts the current time regardless of whether the CPU, a non-volatile memory storing an operation program executed by the CPU including an automatic keystone correction process, which will be described later, a work memory, and power on / off. It is composed of an RTC (Real Time Clock) or the like that continues.

  The control unit 42 is also connected to the Ir receiving units 14 and 18, the leg driving unit 43, the distance measurement processing unit 44, and the audio processing unit 45 via the system bus SB.

  Under the control of the control unit 42, the leg drive unit 43 individually drives each motor (not shown) connected to the adjustment leg units 20 a to 20 d mounted on the lower surface of the main body casing 11. By adjusting the leg lengths of the adjustment legs 20a to 20d, the installation posture of the main casing 11 and the angle of the projection optical axis are controlled.

  The distance measuring unit 44 drives the distance measuring sensor 13 to measure the vertical and horizontal distances to the projection target.

The sound processing unit 45 includes a sound source circuit such as a PCM sound source, converts the sound data given during the projection display operation into an analog signal, and drives the speaker 16 to emit a loud sound.
Each key operation signal in the switch unit 15 is directly input to the control unit 42, and infrared light reception signals in the Ir receiver unit 14 and the Ir receiver unit 18 provided on the back side of the main body casing 11 are also included. Input to the control unit 42.

Next, the operation of the above embodiment will be described.
FIG. 3 shows a preparation from the time when the “AF / AK key” of the switch unit 15 is operated until the projection conditions are adjusted, as a preparation for the projection operation, when the power supply is turned on at the place where the main body casing 11 of the projector apparatus 10 is installed. The contents of the installation work are illustrated, and the processing contents in the projector device 10 are executed based on the operation program stored in advance by the control unit 42.

  Initially, a subroutine for acquiring a parameter value (keystone parameter) for performing keystone correction is executed (step M01). It is assumed that the distance measuring sensor 13 shifts the optical axis of the image formation in the vertical direction by a predetermined angle in conjunction with each chart image (UH, UM, UL) to be projected.

FIG. 4A shows the processing contents of this subroutine. First, the horizontal chart image UH shown in FIG. 4B is projected and displayed by the projection system including the projection lens 12 (step S01).
The horizontal chart image UH includes three point images arranged in the horizontal direction at equal intervals of the field of view at the upper end position of the projection range set in the projection lens 12 at that time.

  In a state where the image UH on the horizontal chart is projected and displayed, the distance “UC” to the projection image position of the point located at the center, the distance “UL” to the projection image position of the point located on the left side, and the position on the right side The distance “UR” to the projected image position of the point to be measured is sequentially measured by the distance measurement sensor 13 and the distance measurement processing unit 44 (step S02).

  Next, instead of the horizontal chart upper image UH shown in FIG. 4B, the horizontal chart intermediate image MH is projected and displayed by the projection system including the projection lens 12 (step S03).

  The horizontal chart middle image MH is also composed of three point images arranged in the horizontal direction at equal intervals in the same manner as the horizontal chart upper image UH, and the projection range set for the projection lens 12 at that time. Is in an intermediate position in the vertical direction component.

  In a state where the image MH in the horizontal chart is projected and displayed, the distance “MC” to the projection image position of the point located at the center, the distance “ML” to the projection image position of the point located on the left side, and the position on the right side The distance “MR” to the projected image position of the point to be measured is sequentially measured by the distance measurement sensor 13 and the distance measurement processing unit 44 (step S04).

  Further, the horizontal chart lower image LH is projected and displayed instead of the horizontal chart middle image MH shown in FIG. 4B by the projection system including the projection lens 12 (step S05).

  The horizontal chart lower image LH also includes three point images arranged in the horizontal direction at equal intervals of the angle of view at the upper end position of the projection range set in the projection lens 12 at that time.

  With this horizontal chart lower image LH projected and displayed, the distance “LC” to the projected image position of the point located at the center, the distance “LL” to the projected image position of the point located on the left side, and the position on the right side The distance “LR” to the projected image position of the point to be measured is sequentially measured by the distance measurement sensor 13 and the distance measurement processing unit 44 (step S06).

  As a result, a total of 9 distance values of 3 × 3 are obtained, and when these distance values are acquired as parameter values (keystone parameters) for keystone correction, FIG. The process returns to the main routine, and specific trapezoid correction processing is started (step M02).

That is, first, the vertical component difference “TY” between the upper and lower end points of the range projected by the projection lens 12 at that time is acquired (step M03).
FIG. 5A shows a state where nothing is projected and displayed on the screen SC to be projected, whereas FIG. 5B shows an initial projection range PA by the projection lens 12 and this projection range. A rectangular projection range RT obtained when the trapezoidal correction process is directly performed from PA is shown.

  Since a total of nine distance values of 3 × 3 in the horizontal direction are obtained by the subroutine in step M01, the direction of the screen SC to be projected with respect to the plane perpendicular to the projection optical axis of the projection lens 12 The degree of inclination can be calculated.

  Therefore, the direction and degree of the inclination of the screen SC, the distance “UL” to the projected image position of the point located on the left side of the horizontal chart image UH in FIG. 4B, and the projection of the point located on the right side Based on the distance “UR” to the image position, the vertical component difference “TY” between the upper and lower end points in the projection range PA is calculated and acquired.

Subsequently, the vertical component difference “BY” between the lower end points of the projection range PA at that time is acquired (step M04).
The vertical component difference “BY” between the lower end points also corresponds to the direction and degree of the inclination of the screen SC, and the distance “to the projected image position of the point located on the left side of the horizontal chart lower image LH in FIG. LL ”and the distance“ LR ”to the projected image position of the point located on the right side are calculated and acquired.

  Based on the vertical component differences “TY” and “BY” at both end points of the upper and lower sides before trapezoidal correction, the sum of these values becomes “0 (zero)”. In other words, the sign of these values is In the opposite case, a value that is considered to be equal in absolute value is calculated (step M05).

  For example, the vertical component difference “TY” obtained by subtracting the distance value “UL” to the left end point from the distance value “UR” corresponding to the distance to the right end point on the upper side of the projection range PA is “(+) 20”. The vertical component difference “BY” obtained by subtracting the distance value “LL” to the left end point from the distance value “LR” corresponding to the distance to the right end point of the lower side of the projection range PA is “−10”. Suppose there was.

  In this case, in order for the vertical component difference “TY” at the upper end points of the projection range PA to be “(+) 15” and the vertical component difference “BY” at the lower end points of the projection range PA to be “−15”, the projection range How much the PA is tilted along the projection optical axis and how much the projection optical axis should be changed in the elevation angle or depression direction, the mounting position of the adjusting legs 20a to 20d, the mounting position of the projection lens 12, and the projection It is obtained by calculation from the angle of view and the leg lengths of the adjusting leg portions 20a to 20d at that time.

  However, based on the calculation result, the driving amount of each motor (not shown) that rotationally drives the adjusting leg portions 20a to 20d determines in which direction the adjusting leg portions 20a to 20d should be further expanded and contracted by the leg driving portion 43. (Step S06).

  Based on the drive amounts of the motors calculated in this way, the control unit 42 rotates the motors so that the leg lengths of the adjustment leg portions 20a to 20d are actually variably set by the leg drive unit 43 (step M07). By repeatedly executing the process of determining whether or not the calculated value has reached the above-described value (step M08), the motor waits for the calculated drive amount for each motor.

  Thus, when the motors that change the leg lengths of the adjusting leg portions 20a to 20d have finished executing the drive for the calculated drive amount, this is determined in step M08, and the processing relating to the variable setting of the projection range PA has been described above. Exit.

  FIG. 5C exemplifies a state where the entire projection range PA shown in FIG. 5B is tilted to the right by the necessary amount about the projection optical axis. Here, the vertical component difference “TY” at the upper end points of the projection range PA is equal to the vertical component difference “BY” at the lower end points, and as a result, the rectangular projection range RT obtained by automatic trapezoidal correction is It can be seen that it is larger than the state shown in FIG.

  In this way, automatic trapezoidal correction processing is actually executed in a state where the angle of the projection range PA is tilted as necessary so as to obtain a larger rectangular projection range RT (step M09), and the obtained rectangular projection is obtained. An automatic focusing process is executed so as to focus on, for example, the center position of the range RT (step M10), and the preparation for the projection operation based on the process of FIG.

  FIG. 6A illustrates the attitude of the projector device 10 from the back side before the processing according to FIG. 3 is executed, whereas FIG. 6B illustrates the processing according to FIG. The attitude | position of the projector apparatus 10 after performing is illustrated.

  Here, as compared with the case where the leg lengths of the adjusting leg portions 20b and 20c located on the right side of the projector device 10 are not changed, both the adjusting leg portions 20a and 20d located on the left side are greatly extended. As an example, the projector device 10 is largely tilted to the right.

  Therefore, the projection range by the projection lens 12 (not shown here) located in front of the projector device 10 is also inclined, and the rectangular projection range RT by the automatic trapezoidal correction based on the projection range PA as shown in FIG. The area can also be changed, specifically increased.

  6A and 6B are shown in a state in which no other device is connected to the input / output connector portion 17 and the AC adapter connection portion 19 on the rear surface of the projector device 10. However, at the time of preparation before the projection operation, an AC adapter cable (not shown) is connected to at least the AC adapter connection portion 19 to supply power from the AC adapter.

  In this manner, by controlling the leg lengths of the adjusting leg portions 20a to 20d of the projector device 10 and changing the installation angle, the area of the projected image is reduced while executing the automatic trapezoidal correction process. It is possible to suppress the occurrence as much as possible.

  In addition, the vertical component difference “TY” at the upper end points of the projection range PA is made equal to the vertical component difference “BY” at the lower end points of the projection range PA. Therefore, it is possible to obtain a projection image that is more accurately trapezoidally corrected visually.

  In the above embodiment, the vertical component difference “TY” at the upper end points of the projection range PA and the vertical component difference “BY” at the lower end points of the projection range PA are set equal to each other, but steps M03 to M05 in FIG. Instead of the processing shown in FIG. 7, the horizontal component difference “LX” at the left end points of the projection range PA and the horizontal component difference “RX” at both right end points of the projection range PA are made equal, as shown in FIG. It is also possible to perform trapezoidal correction processing with an emphasis on the vertical direction.

  In this case, since the keystone correction is performed based on the degree of change in the left and right sides shorter than the upper and lower sides of the projection range PA, the automatic correction process can be completed in a shorter time.

  In the above-described embodiment, the distance to a plurality of positions in the projection range is obtained by the distance measuring sensor 13 arranged close to the projection lens 12, and the keystone parameter value is obtained. However, the present invention is limited to this. For example, an imaging unit with an automatic focusing function is provided instead of the distance measuring sensor 13, and distances to a plurality of positions in the projected image are sequentially switched by the automatic focusing function of the imaging unit. It may be acquired.

  In addition, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention.

  Further, the above embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, even if some constituent elements are deleted from all the constituent elements shown in the embodiment, at least one of the problems described in the column of the problem to be solved by the invention can be solved, and described in the column of the effect of the invention. In a case where at least one of the obtained effects can be obtained, a configuration in which this configuration requirement is deleted can be extracted as an invention.

1 is a perspective view showing an external configuration of a projector apparatus according to an embodiment of the present invention. 2 is a block diagram showing a functional configuration of the electronic circuit according to the embodiment. FIG. The flowchart which shows the processing content of the automatic focusing / automatic keystone correction which concerns on the embodiment. The flowchart which shows the processing content of the subroutine of the keystone parameter acquisition of FIG. 4 which concerns on the embodiment. The figure which illustrates the change of the projection state which concerns on the same embodiment. The figure which shows the change of the attitude | position of the projector apparatus which concerns on the same embodiment. Other related to the same embodiment

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Projector apparatus, 11 ... Main body casing, 12 ... Projection lens, 13 ... Distance sensor, 14 ... Distance sensor, 15 ... Switch part, 16 ... Speaker, 17 ... Input / output connector part, 18 ... Ir receiver part, 19 ... AC adapter connection part, 20a to 20d ... Adjustment leg part, 31 ... Input / output interface (I / F), 32 ... Image conversion part, 33 ... Display encoder, 34 ... Video RAM, 35 ... Display drive part, 36 ... Space 37: reflector, 38 ... light source lamp, 39 ... color wheel, 40 ... mirror, 41 ... lens motor (M), 42 ... control unit, 43 ... leg drive unit, 44 ... distance measurement processing unit, 45 ... voice processing unit, PA ... projection range, RT ... (after trapezoid correction processing) projection range, SB ... system bus, SC ... screen.

Claims (5)

Projection means for projecting an image;
A plurality of legs provided on the lower surface of the device housing, the length of which can be individually adjusted;
Leg driving means for individually adjusting and driving the lengths of the plurality of legs to vary the projection image range of the projection means; and
Detection means for detecting a projection image range on a projection target by the projection means;
Control means for individually controlling the lengths of the plurality of legs by the leg driving means based on the projection image range obtained by the detecting means;
A projection apparatus comprising trapezoidal correction means for changing the projection image of the projection means so that the image range becomes rectangular based on the projection image range changed by the control of the control means.   The control means individually adjusts the lengths of the plurality of leg portions by the leg length adjustment means so that the vertical component difference between the upper end points of the projection image range and the vertical component difference of the lower end points are substantially equal. The projection apparatus according to claim 1, wherein the projection apparatus is controlled to be driven.   The control means individually adjusts the lengths of the plurality of leg portions by the leg length adjusting means so that a horizontal component difference between both end points of the left side of the projection image range is substantially equal to a horizontal component difference between both end points of the right side. The projection apparatus according to claim 1, wherein the projection apparatus is controlled to be driven. A projection unit that projects an image, a plurality of legs that are provided on the lower surface of the apparatus housing, the lengths of which can be individually adjusted, and the above-mentioned projection units that are individually adjusted and driven to adjust the lengths of the plurality of legs A projection method including a leg driving unit that varies a projection image range of
A detection step of detecting a projection image range on a projection target by the projection unit;
A control step of individually controlling the lengths of the plurality of legs by the leg driving unit based on the projection image range obtained in the detection step;
And a trapezoidal correction step of changing the projection image of the projection unit so that the image range becomes a rectangle based on the projection image range changed by the control in the control step. A projection unit that projects an image, a plurality of legs that are provided on the lower surface of the apparatus housing, the lengths of which can be individually adjusted, and the above-mentioned projection units that are individually adjusted and driven to adjust the lengths of the plurality of legs A program executed by a computer incorporated in a projection apparatus having a leg drive unit that varies the projection image range of
A detection step of detecting a projection image range on a projection target by the projection unit;
A control step of individually controlling the lengths of the plurality of legs by the leg driving unit based on the projection image range obtained in the detection step;
A program for causing a computer to execute a trapezoid correction step for changing a projection image in the projection unit so that the image range becomes a rectangle based on the projection image range changed by the control in the control step. .

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