JP2017049550A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correct a registration deviation as easily as possible, even when the registration deviation is large because of a change with the elapse of time.SOLUTION: A display device 10 including a plurality of display panels includes storage parts 111 and 112 which have a deviation amount corresponding to a distance from an optical axis position for each color component as a correction parameter, a processing part 103 which deforms an image for each color component, a projection part 110 which projects a pattern including an adjustment point onto a screen, a change part which changes the pattern of a specified color component, according to an instruction from a user, a correction part which corrects the correction parameter, according to the change of the position of a point by the user, and a calculation part which calculates the coordinate after deformation of each pixel of the specified color component by using the correction parameter after correction by the correction part and sets information on the calculated coordinate after deformation to the processing part 103.SELECTED DRAWING: Figure 1A

Description

  The present invention relates to registration deviation adjustment that can be performed by a display device having a plurality of display panels.

  In a projector having three transmissive display panels corresponding to the three color components (R, G, B), the three color components on the projection surface due to misalignment of the display panel, lateral chromatic aberration which is an optical characteristic, and the like. There may be a registration shift in which three images corresponding to (R, G, B) shift. To solve this problem, a method of adjusting the position by changing the display position on the display panel in units of one pixel by changing the image reading position of the three color components (R, G, B) with respect to the reference signal. There is. There is also a method of adjusting a shift of one color or less of the three color components (R, G, B) within the effective area by image deformation processing. In the former method, the image reading position is shifted in the upward, downward, left or right direction. Since this shift processing is performed in units of pixels, when attention is paid to one color component, there is no deterioration in the image quality of the image of that color component, but the position adjustment of the shift of one pixel or less cannot be performed. In the latter method, in addition to shifting the entire image, the rotation direction and the lateral chromatic aberration are corrected. In order to perform position adjustment by image processing, luminance distribution is performed between adjacent virtual pixels generated from the corrected pixels. As a result, adjustment can be performed with a size or distance of one pixel or less. However, on the other hand, the difference in luminance distribution of the three color components (R, G, B) appears as image quality degradation.

  By adjusting the position by combining these adjustments, the registration shift of the three color components (R, G, B) can be substantially corrected. The latter position adjustment function by image processing is generally a method of correcting by linearly interpolating between lattice points by setting lattice points. In this method, the user adjusts the position of all grid points little by little to eliminate the registration shift, but it takes much time. Since the registration shift changes depending on the zoom position or the lens shift position, user adjustment is required every time the zoom position or the lens shift position is changed. For this reason, it is desired to improve usability so that the registration deviation can be adjusted even if the zoom position or the lens shift position is changed.

  Patent Document 1 discloses a method of performing correction by having a correction table in accordance with the zoom position and the lens shift position. By setting multiple reference pixels among the pixels in the display panel and having information on the amount of deviation for each zoom position and lens shift position as table data for the reference pixel, correction is made even if the zoom position and lens shift position change. Has come to follow. In this way, it is not necessary for the user to adjust each time the zoom position or the lens shift position is changed.

JP 2010-103886 A

  However, in Patent Document 1, it is necessary to store the registration deviation amount of the reference pixel on the display panel for each zoom magnification and lens shift position, and the amount of table data may be enormous. In order to correct the registration error with high accuracy, there is a problem that the amount of data increases in order to increase the reference pixel. Furthermore, when the registration deviation is increased due to a change over time, the user has to adjust the pixel position for each zoom position or lens shift position.

  Accordingly, an object of the present invention is to make it possible to correct a registration error as easily as possible even when the registration error is large due to a change over time.

  In order to achieve the above object, a display device according to the present invention is a display device having a plurality of display panels, the detection means for detecting an optical axis position on the display panel, and the light for each color component. Two or more adjustments to be adjusted by the user in the storage means having a deviation amount corresponding to the distance from the axis position as a correction parameter, processing means for deforming an image for each color component, and the plurality of display panels By displaying a pattern including a point, a projection unit that projects an image indicated by the pattern on a screen, and according to an instruction from the user, the position of the adjustment point specified by the color component specified by the user is changed. In order to do so, a change means for changing the pattern of the designated color component, a correction means for correcting the correction parameter in accordance with a change in the position of the point by the user, Based on the distance of the optical axis position detected by the detecting means, using the correction parameters corrected by the correcting means, the coordinates after deformation of each pixel of the designated color component are calculated, and the calculated coordinates after the deformation are related. Calculation means for setting information in the processing means.

  According to the present invention, it is possible to correct a registration error as easily as possible even when the registration error is large due to a change over time.

3 is a block diagram for explaining a plurality of components included in the display device 10 according to Embodiment 1. FIG. It is a block diagram for demonstrating the some component which the image process part 103 shown to FIG. 1A has. It is a figure for demonstrating registration shift. It is a figure for demonstrating the outline | summary of registration deviation adjustment. It is a figure for demonstrating the detailed operation | movement of registration deviation adjustment. It is a figure for demonstrating the outline | summary of the position adjustment method of the registration shift | offset | difference by image processing. It is a figure which shows the meaning of the correction parameter in Embodiment 1, and its example. 6 is a flowchart for explaining registration deviation adjustment processing according to the first embodiment. FIG. 6 is a diagram for explaining a registration deviation adjustment menu according to the first embodiment. It is a flowchart for demonstrating the correction process of a correction parameter. It is a figure which shows the example of the conversion table after correction | amendment in a correction process. It is a figure for demonstrating the calculation process of the distance to each adjustment point from an optical axis position. 5 is a flowchart for explaining a deformation process in the first embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited to the following embodiments.

[Embodiment 1]
FIG. 1A is a block diagram for explaining a plurality of components included in the display device 10 according to the first embodiment. In the first embodiment, an example in which a projector having three transmissive display panels corresponding to three color components (R (red), G (green), and B (blue)) operates as the display device 10 will be described. However, the display device 10 according to the first embodiment is not limited to such a projector, and may be another display device. In the first embodiment, an OSD (on screen display) image used for adjustment of registration deviation will also be described.

  Registration deviation will be described with reference to FIG. Registration shift refers to a state in which images of three color components (R, G, B) are shifted from each other on the screen and do not become correct images. FIG. 2A shows the original correct image by correctly overlapping the images of the three color components (R, G, B). On the other hand, FIG. 2B shows an example in which an image cannot be correctly viewed due to a shift. An image due to such registration shift does not have a sense of resolution to the eye, and is slightly blurred. For this reason, it is required to adjust the registration deviation by image processing based on the shift and deformation of the image capturing position on the display panel to obtain the state shown in FIG. If it is in the state of FIG.2 (c), a color will overlap correctly to some extent as a projection image, and it will have a sharper impression than the state of FIG.2 (b). However, since the image of each color component is blurred by luminance distribution between adjacent pixels by image processing, the image is more likely to deteriorate as the adjustment amount increases. In the example of FIG. 2C, the image is in a deteriorated state as compared with FIG.

  The display device 10 performs registration deviation adjustment using the pattern shown in FIG. A pattern 301 is an adjustment target pattern. Patterns 302 and 303 are patterns of color components to be adjusted, 302 indicates an example of a pattern after adjustment, and 303 indicates a pattern before adjustment. The adjustment target pattern 301 is shown for convenience in order to show the relative position with respect to the patterns 302 and 303, and is not actually displayed. In the first embodiment, the user can move a total of five points including points at the four corners of the pattern (reference numerals 304a to 304d) and intersections of diagonal lines (reference numeral 304e). Since the pattern of one color component is a reference pattern, the user adjusts the remaining two color components. As a result, the maximum number of points moved by the user is 10, and the user's instruction can be simplified. The instruction relating to the registration deviation adjustment for the user is the selection of the color component to be adjusted, the selection of one of the five points that define the pattern of the selected color component, and the movement instruction of the selected point. .

  In the first embodiment, a method for easily and accurately adjusting registration deviations other than the adjustment points in consideration of the adjustment amount of the adjustment points will be described.

  Next, with reference to FIG. 1A, the some component which the display apparatus 10 in Embodiment 1 has is demonstrated. The display device 10 may be a display device having a DMD (Digital Micromirror Device) or a display device having an LCOS (reflection liquid crystal) panel.

  The image input unit 101 is an input interface for inputting image data to be projected from an external device. The image input unit 101 includes interfaces such as composite, component, DVI-D, and HDMI (registered trademark), for example.

  The control unit 102 controls each component of the display device 10 and includes a CPU (Central Processing Unit) and a memory. The control unit 102 controls each component of the display device 10 according to an instruction input from the communication unit 105 or the instruction input unit 106. The image processing unit 103 performs signal processing so that the input image signal is suitable for display on the display unit 107 (having three transmissive display panels corresponding to three color components (R, G, B)). . For example, the image processing unit 103 performs processing related to resolution conversion, color correction, and registration deviation adjustment on the image input from the image input unit 101.

  The display panel drive unit 104 generates drive pulse signals for driving the three display panels R, G, and B constituting the display unit 107 from the synchronization signal superimposed on the input signal. The display panel drive unit 104 changes the image signal capture position of each color component output from the image processing unit 103 in units of one clock or one horizontal line, using the horizontal synchronization signal Hsync and the vertical synchronization signal Vsync as reference signals. This change instruction is given by the control unit 102. The control unit 102 issues a change instruction independently for each of the R, G, and B color components. As a result, the display position of the image of each color component on the display unit 107 can be shifted up, down, left, or right in units of one pixel.

  An example of the shift instruction and the result will be described with reference to FIGS. 4 (a) and 4 (b). Reference numerals 401, 402, 403, and 404 in FIGS. 4A and 4B respectively indicate pixels. Reference numeral 401 is a pixel that is black (gradation value = 0), and reference numeral 402 is a pixel that has some gradation value. When the registration deviation is adjusted by the display panel driving unit 104, the display panel driving unit 104 shifts in units of one pixel. Therefore, when the instruction from the user is a left shift, the display panel driving unit 104 determines the timing of capturing the image signal of the corresponding color component. Make one clock faster. As a result, as shown in FIG. 4B, the image of the corresponding color component is shifted to the left in FIG. 4A by one pixel.

  The communication unit 105 communicates with an external device such as a printing device, another display device, or a distributor. Note that communication with an external device may be either wired communication or wireless communication.

  The instruction input unit 106 inputs an image from an external apparatus and projects / selects a mode for performing registration deviation adjustment, a selection instruction for a color component in the registration deviation adjustment mode, the upper, lower, left or right There is no particular limitation on the form as long as a shift instruction can be given. For example, it consists of a switch, dial, touch panel, mouse and the like. The instruction input unit 106 may be, for example, a receiving unit (such as an infrared receiving unit) that receives an instruction from a remote controller and transmits the received instruction to the control unit 102.

  The display unit 107 includes a plurality of display panels (in the first embodiment, three display panels R, G, and B). Each display panel is formed with images of different color components. The light source 108 supplies light to a plurality of display panels included in the display unit 107.

  The illumination optical system 109 collimates the light emitted from the light source 108 and outputs it as a light beam toward the display panel of each color component included in the display unit 107. The projection optical system 110 projects light (optical image) transmitted through the display panel of each color component included in the display unit 107 onto the screen as a projection image. The projection optical system 110 can be physically shifted in the horizontal / vertical direction according to an instruction from the control unit 102. When the projection optical system 110 is shifted, the optical axis moves, and the projected image can be moved horizontally / vertically on the screen while maintaining the shape. This function is called lens shift. Information indicating the shift position of the projection optical system 110 and the optical axis position with respect to the display unit 107 accompanying the lens shift is stored in a rewritable memory in the control unit 102.

  The first memory 111 stores a program used by the control unit 102, data referred to when the program is executed, and a registration deviation correction parameter. In the first embodiment, for each of R, G, and B color components, a value for replacing the registration deviation amount on the projection surface with the distance on the display panel is used for each correction parameter for each distance (image height) from the optical axis. Have as. For example, the correction parameter is a design value or measurement value such as lateral chromatic aberration or distortion of the projection optical system. When the display device 10 can replace the projection optical system 110, different correction parameters are required for each type of the projection optical system 110. Therefore, the first memory 111 stores correction parameters for each type of the projection optical system 110. The display device 10 has a sensor for detecting the mounting of the projection optical system 11 and identifying what type of projection optical system 11 is mounted. Here, the mountable projection optical system 110 includes a short focus lens, a standard lens, a telephoto lens, and the like.

  Here, the meaning of the correction parameter will be described with reference to FIGS. 6 (a) to 6 (d). In FIG. 6A, reference numeral 601 is the optical axis of the projection optical system 110. Reference numeral 602 is a screen. The display unit 107 may be any of R, G, and B display panels. The display unit 107 includes a plurality of dichroic mirrors, which are omitted in the drawing. FIG. 6A should be understood as a conceptual diagram.

  In FIG. 6A, the pixel at a position 603 a where the display unit 107 is present is displayed on the screen 602 through the projection optical system 110. In the case of an ideal projection optical system, a pixel is projected at the projection position 604a. However, since the projection optical system 110 actually has distortion and lateral chromatic aberration, the pixel is projected at the projection position 604b. In order to project to the original projection position 604a, the pixel needs to be displayed not at the position 603a but at the position 603b.

  The image heights shown in FIGS. 6B to 6D are the distance [mm] between the positions 603a and 603b on the display unit 107. FIG. Numerical values described for each of R, G, and B indicate how many pixels [pix] are deviated as lateral chromatic aberration with respect to a certain image height [mm]. Since the projection optical system 110 has a concentric symmetry with respect to the optical axis 601, it may be a one-dimensional parameter with the image height being the distance from the optical axis 601 on the display unit 107 as an axis. 6 (b) to 6 (d), there are three types of positions of discrete zoom lenses represented by zoom magnifications represented by the wide end (WIDE), the center (MIDDLE), and the tele end (TELE). Shows the table.

  In the first embodiment, a case where the display device 10 has the correction parameters as a table will be described, but the present invention is not limited to such a configuration. For example, the deviation amount may be calculated by a predetermined function. The case where the display device 10 has data such as the chromatic aberration of magnification of the optical system will be described, but is not limited to such a configuration. For example, data such as lateral chromatic aberration may be calculated by a function such as y = ax + b.

  The control unit 102 can execute a plurality of programs stored in the first memory 111. The first memory 111 stores an adjustment point setting program, a correction program for correcting correction parameters, and a modified coordinate calculation program. Details of processing using each program will be described later with reference to the flowchart of FIG.

  The second memory 112 has intermediate data when the control unit 102 executes a program in the first memory 111. For example, there are a correction parameter calculated by a correction program for correcting a correction parameter, a deformation coordinate table calculated by a deformation coordinate calculation program, and the like.

  Next, a plurality of components included in the image processing unit 103 will be described with reference to FIG. 1B.

  The projection target image supplied from the external device is first processed by the resolution conversion unit 201. The resolution conversion unit 201 converts the resolution of the input image to a desired resolution. In the first embodiment, conversion is performed to match the resolution of the display unit 107. For example, when the resolution of the display unit 107 is horizontal 1920 × vertical 1080 and the resolution of the input image is 1280 × 720, both horizontal and vertical are enlarged 1.5 times using interpolation processing, and 1920 × 1080. Convert to pixel. In this way, when the aspect ratio of the resolution of the display unit 107 and the resolution of the input image is the same, it may be simply enlarged.

  However, when the resolution of the input image is 1024 × 768 pixels and the aspect ratio is different from that of the display unit 107, the input image is enlarged while maintaining the aspect ratio of the input image in accordance with the ratio of the vertical or horizontal width. You may do it. Then, the enlarged image may be arranged so as to be displayed at the center of the display unit 107. As a result, blank areas are generated above and below or left and right of the display unit 107, and pixels in the blank area are replaced with black pixels.

  The color correction unit 202 performs color correction such as color matrix conversion, chroma processing, gamma processing, and color space conversion in order to make the projected image appropriate.

  The deformation processing unit 203 deforms the input image into an arbitrary shape according to an instruction from the control unit 102. The deformation processing unit 203 deforms the image independently for each of the R, G, and B color components and writes the image in the frame memory 204. When the writing is completed, a signal is read from the frame memory 204, and the transformed image signal is output to the display unit 107 via the transformation processing unit 203. The deformation processing unit 203 obtains the coordinates of the pixels before and after the deformation based on a predetermined deformation formula, and outputs a post-deformation image signal. Deformation processing of the deformation processing unit 203 in the first embodiment will be described below.

  As a method of deforming into an arbitrary shape, there is a method in which lattice points are set in advance, coordinates to which the lattice points are moved after the deformation are designated, and an image is deformed by interpolating between the moved lattice points. As shown in FIG. 5A, the deformation processing unit 203 has a plurality of adjustment points 501 in the form of lattice points.

  The interpolation method will be described with reference to FIGS. 5B and 5C. FIG. 5B shows the state before deformation, and FIG. 5C shows the state after deformation. Adjacent grid points used for interpolation are defined as P1, P2, P3, and P4. The coordinate S of the pre-deformation image in FIG. 5B becomes the coordinate D of the post-deformation image when the grid point P1 is moved as shown in FIG. 5C. P1 'is an intersection of a straight line passing through the lattice point P1 and the coordinate S and a line segment connecting the lattice points P2 and P4. The position of the coordinate S of the pre-deformation image is the position of α: 1−α of the line segment P1-P1 ′. The position of the point P1 'is the position of β: 1-β of the lattice points P2 and P4. The coordinates D of the post-deformation image can also be obtained from the coordinates of the grid points P1, P2, P3, and P4 and the ratios. At this time, if the coordinate D of the post-deformation image is an integer, this may be used as it is as the pixel value of the coordinate S of the pre-deformation image. However, the transformed coordinates obtained by interpolation are not always integers. In that case, the pixel value of the coordinate D of the post-transformation image is obtained by performing interpolation using the pixel values of the peripheral pixels of the coordinate D of the post-deformation image. The interpolation method may be bilinear, bicubic, or any other interpolation method. In this method, when FIG. 4A is shifted to the left by less than one pixel, the result is as shown in FIG. The luminance is distributed and adjusted so that the color corresponding to the reference numeral 402 can be seen with the integral value of the two pixels denoted by reference numerals 403 and 404 in FIG. In the example of FIG. 4C, the adjustment is made such that the luminance center of gravity is slightly closer to the 404 side. Note that adjustment of the integer part of the shift amount may be performed by the display panel driving unit 104 under the control of the control unit 102. When adjustment of the integer part of the shift amount is performed by the display panel driving unit 104, adjustment of the part other than the integer part of the shift amount is performed by the deformation processing unit 203.

  By performing the deformation process, there is a possibility that the size becomes smaller than the pre-deformation image. In the display unit 107, pixels in an area that has been displayed before the deformation process and that are not displayed by the deformation process are replaced with black or a background color set by the user. This replacement process is performed by the deformation processing unit 203 in accordance with an instruction from the control unit 102. In addition to adjusting the position of a part of the image in this way, the deformation processing unit 203 can also shift the entire image by adding an offset of the same value to the position information of all grid points.

  The deformation processing unit 203 creates a post-deformation image by obtaining pixel values for all the coordinates of the post-deformation image according to the above procedure. The deformation processing unit 203 performs deformation independently for each of the three color components (R, G, B). This function makes it possible to adjust the registration deviation electrically.

  Here, the control unit 102 selects the registration deviation adjustment mode according to an instruction input to the instruction input unit 106 by the user. In the registration deviation adjustment mode, the deformation processing unit 203 inputs an image from the OSD generation unit 205. The OSD generation unit 205 generates a menu image or a registration deviation adjustment pattern image (FIG. 3) shown in FIG. 3 according to the control of the control unit 102. As described above, the image supplied from the external apparatus to the image input unit 101 is not projected while the registration deviation adjustment mode is selected.

  In the registration shift adjustment mode, the control unit 102 is input with the coordinate adjustment amount of one point selected by the user among the points 304a to 304e in FIG. 3 in the pattern of the color component selected by the user. . The control unit 102 executes correction processing on the correction parameters stored in the first memory 111 by the correction parameter correction program for some of the adjustment points 501 in FIG. Is stored in the second memory 112. Next, the control unit 102 executes a deformed coordinate calculation program using the corrected correction parameter, and calculates the adjusted pixel position of the adjustment point 501. Then, the control unit 102 passes the calculated deformation coordinate table to the deformation processing unit 203 to perform deformation.

  FIG. 8 shows a menu generated by the OSD generation unit 205 in the registration deviation adjustment mode. This menu includes “adjustment color”, “shift adjustment”, and “5-point adjustment” as selection items. When the user selects “5-point adjustment” from the instruction input unit 106, the process starts based on the flowchart of FIG.

  When the item “adjustment color” in FIG. 8 is designated, the user can change the color component to be adjusted. When the item “shift adjustment” is designated, the user can shift the entire pattern of the selected color component to be adjusted in the horizontal direction and the vertical direction according to the adjustment amount designated by the user. When the item “5-point adjustment” is designated, the user can select one adjustment point of the five patterns shown in FIG. 3 via the instruction input unit 106 and move the selected adjustment point. It becomes possible.

  Hereinafter, registration deviation adjustment processing performed in the display device 10 will be described. In the first embodiment, it is assumed that the registration deviation is adjusted by the deformation processing unit 203.

  When “5-point adjustment” is selected by the user, the control unit 102 acquires the optical axis position of the projection optical system 110 stored in the first memory 111 in S701. In the first embodiment, the initial optical axis position is set at the center of each display panel, and the initial lens shift position is at the optical axis position. When the resolution of the display unit 107 is 1920 × 1080, the center of the display panel is the coordinates (960, 540), and this value is stored as the optical axis position on the display panel. When the lens is shifted, the lens movement amount and the pixel position of the display unit 107 are stored in association with each other.

  In step S <b> 702, the control unit 102 acquires the zoom position of the zoom lens of the projection optical system 110. For example, it is assumed that the TELE end is normalized to 0, the MIDDLE end is 50, the WIDE end is normalized to 100, and a value between 0 and 100 is acquired as the zoom position.

  In step S <b> 703, the registration reference adjustment reference color is determined in accordance with the user instruction input to the instruction input unit 106. The adjustment reference color may be a preset adjustment reference color. The adjustment reference color is one of R, G, and B color components. Here, it is assumed that G (green) having high luminance is determined as the adjustment reference color. Therefore, the G component is fixed without registration adjustment.

  In step S <b> 704, the control unit 102 causes the OSD generation unit 205 to generate OSD images for five-point adjustment for R, G, and B (see FIG. 3). The 5-point adjustment OSD image is a pattern of line segments connecting the points. The line width of the OSD image is preferably 1 pixel.

  In step S <b> 705, the control unit 102 determines whether or not an adjustment target color has been selected based on a user instruction input to the instruction input unit 106. If the color to be adjusted is selected, the process proceeds to S706. If the selection is canceled, the process proceeds to S710. The adjustment target colors that can be selected here are color components other than the adjustment reference color determined in S703. For example, when G is a target reference color, the adjustment target color is either R (red) or B (blue).

  In step S <b> 706, the control unit 102 acquires the adjustment point selected by the user via the instruction input unit 106 among the adjustment points 303 a to 303 e of the OSD image in FIG. 3. If acquired, the process proceeds to S707. If canceled, the process proceeds to S710.

  In step S <b> 707, the control unit 102 obtains how many counts the adjustment point 303 a to 303 e has moved up, down, left, or right via the instruction input unit 106. . If it can be obtained, the process proceeds to S708. For example, when the adjustment amount is 2 pixels at the maximum and the movement unit is 0.1 pixel, the control unit 102 acquires a normalized value of “−20 to +20” for each of the upper, lower, left, and right. . If canceled, the process proceeds to S710.

  In S708, the control unit 102 performs correction processing based on the optical axis position acquired in S701, the zoom position acquired in S702, the adjustment reference color acquired in S703, the adjustment color acquired in S705 to S707, the adjustment point, and the adjustment amount. Execute. The control unit 102 is based on the information acquired in S701 to S703 and S705 to S707. The correction parameters (see FIGS. 6B to 6D) included in the first memory 111 are corrected. Then, the control unit 102 stores the corrected correction parameter in the second memory 112. This correction process is performed when the control unit 102 executes a correction parameter correction program stored in the first memory 111.

  The correction parameter correction processing will be described with reference to the flowchart of FIG.

  In step S901, the control unit 102 performs conversion processing based on the correction parameter table illustrated in FIGS. 6B to 6D and the adjustment reference color acquired in step S703, and generates a correction table for the color to be adjusted. obtain. The control unit 102 stores the table obtained by this conversion in the second memory 112.

  For example, when the adjustment reference color is G, the colors to be adjusted are R and B. Since the adjustment reference color is fixed, the control unit 102 changes R and B of the color to be adjusted to relative values. FIGS. 10A to 10C show converted tables obtained from FIGS. 6B to 6D. That is, the correction parameter table at the WIDE end in FIG. 6B is converted as shown in FIG. R in FIG. 10 (a) is the value of RG in FIG. 6 (b). B in FIG. 10A is a value of BG in FIG. 6B. Similarly, calculation is performed as shown in FIGS. 10B and 10C. The unit of the image height is a distance [mm]. Numerical values written for each of R, G, and B indicate how many pixels [pix] are deviated as chromatic aberration of magnification with respect to a certain image height [mm].

  In S902, the control unit 102 determines that the zoom position acquired in S702 is a combination of FIG. 10A and FIG. 10B among the tables in FIG. 10A to FIG. It is determined which of 10 (b) and FIG. 10 (c) corresponds to the combination. And the control part 102 produces | generates the table of the correction parameter corresponding to a zoom position by linearly interpolating the value between applicable tables according to the acquired zoom position. For example, when the acquired zoom position is “75”, the combination of FIG. 10A and FIG. 10B is selected because it is intermediate between WIDE and MIDDLE. Since “75” is exactly the central value of the two tables, the average value of the two corresponding values in FIGS. 10A and 10B is calculated. As a result, FIG. 10D is obtained as a correction table corresponding to the current zoom position and stored in the second memory 112.

  In S903, the control unit 102 calculates the distance of each adjustment point from the optical axis position. FIG. 11A shows the distance [mm] from the optical axis 1101 to each of the adjustment points 304a to 304e. FIG. 11B shows R and B adjustment values.

  In step S904, the control unit 102 adds the value calculated in step S902 (see the table in FIG. 10D) and the value acquired in step S903 (see the table in FIG. 11B). The table of FIG. 11 (b) is shown in a numerical range of ± 20 for adjustment values. Since one memory has 0.1 pixel, the adjustment value is multiplied by “0.1” and added so as to match the image height in the table of FIG. As a result, a table as shown in FIG. 11C is generated. In the first embodiment, for the sake of simplicity, the image height in FIG. 10D and the distance in FIG. 11B are set to the same value. If they are different from each other, the number of points in the tables of FIG. 10D and FIG. 11B is increased, and the amount of registration deviation and the adjustment amount of the distances that exist with each other are calculated by linear interpolation.

  The correction parameter correction is thus completed. In the subsequent processing, the table of FIG. 11C obtained in S904 is used.

  Returning to the description of FIG. In step S709, the control unit 102 executes the modified coordinate calculation program stored in the first memory 111 using the correction parameter table generated in step S708, and generates a modified coordinate table. Then, the control unit 102 transmits the generated deformation coordinate table to the deformation processing unit 203. As a result, the deformation processing unit 203 deforms the entire image according to the movement amount in the deformation coordinate table at each lattice point.

  Here, the processing contents of the modified coordinate program will be described with reference to the flowchart of FIG.

  In S1201, the control unit 102 converts the orthogonal coordinate system, which is the coordinate system of the lattice point coordinates, into a polar coordinate system with the optical axis acquired in S701 as the origin.

  In S1202, the control unit 102 adds the amount of registration deviation from the correction parameter table calculated in S708 according to the distance of each grid point (however, since the table is the number of pixels [pix], the number of pixels And the product of the pixel pitch and multiplication).

  In S1203, control unit 102 converts the polar coordinate system into an orthogonal coordinate system. The lattice point coordinates obtained here are the deformation coordinate table. The deformed coordinate table may be handled by data of a one-dimensional array or a two-dimensional array.

  In step S <b> 1204, the control unit 102 supplies the deformation coordinate table to the deformation processing unit 203 to reflect the deformation coordinate table in the deformation processing by the deformation processing unit 203. Thus, the deformation process is completed.

  Returning to the description of FIG. In step S710, the control unit 102 determines whether or not the registration deviation adjustment has been completed based on an instruction from the instruction input unit 106 by the user. If it is instructed to end the registration deviation adjustment, the process proceeds to S711. If registration deviation adjustment is not completed, the process returns to S705.

  In step S <b> 711, the control unit 102 deletes the OSD image generated by the OSD generation unit 205. The registration deviation adjustment is thus completed. Here, when the user inputs an instruction to end a mode for performing registration deviation adjustment by using the instruction input unit 106, the display device 10 is switched to a mode in which an image from an external device is input and projected. As a result, the display device 10 projects the image after the registration deviation adjustment.

  In the first embodiment, the OSD image pattern is not limited to the pattern shown in FIG. The OSD image pattern may be selected by the user from a plurality of patterns. In the first embodiment, the case where the number of adjustment points is five has been described, but the number of adjustment points may be a predetermined number of two or more. For example, the number of adjustment points may be two, four, or nine.

  In the first embodiment, the optical axis position is stored in the memory in advance. However, the optical axis position may be detected using an imaging unit. For example, dots are displayed at arbitrary positions, and the projection image is acquired by the imaging means while changing the zoom rate of the projection optical system 110. The portion where the extension lines of the dot motion vectors before and after the zoom rate change overlap can be estimated as the optical axis.

  In the first embodiment, the registration deviation is adjusted by image processing. However, position adjustment by the display panel driving unit 104 may be combined.

  In the first embodiment, the registration deviation is adjusted by performing electrical correction using a deformation process. However, the present invention is not limited to this, and a method of mechanically adjusting the position of the display panel may be used. It may be a method of adjusting the position of the display panel electrically, or a method of adjusting the position of the display panel manually.

[Embodiment 2]
The various functions, processes, and methods described in the first embodiment can be realized by a personal computer, a microcomputer, a CPU (Central Processing Unit), and the like using a program. Hereinafter, in the second embodiment, a personal computer, a microcomputer, a CPU, and the like are referred to as “computer X”. In the second embodiment, a program for controlling the computer X and for realizing the various functions, processes, and methods described in the first embodiment is referred to as “program Y”.

  The various functions, processes, and methods described in the first embodiment are realized by the computer X executing the program Y. In this case, the program Y is supplied to the computer X via a computer-readable storage medium. The computer-readable storage medium according to the second embodiment includes at least one of a hard disk device, a magnetic storage device, an optical storage device, a magneto-optical storage device, a memory card, a volatile memory, and a nonvolatile memory. The computer-readable storage medium in the second embodiment is a non-transitory storage medium.

DESCRIPTION OF SYMBOLS 10 ... Display apparatus, 102 ... Control part, 103 ... Image processing part, 105 ... Communication part, 106 ... Instruction input part, 201 ... Resolution conversion part, 202 ... Color correction part, 203 ... Deformation processing part, 204 ... Frame memory, 205 ... OSD generator

Claims (6)

A display device having a plurality of display panels,
Detecting means for detecting an optical axis position on the display panel;
Storage means having, as a correction parameter, a deviation amount corresponding to the distance from the optical axis position for each color component;
Processing means for transforming the image for each color component;
Projecting means for projecting an image indicated by the pattern on a screen by displaying a pattern including a predetermined number of adjustment points to be position-adjusted by the user on the plurality of display panels;
Changing means for changing the pattern of the designated color component in order to change the position of the designated adjustment point of the color component designated by the user in accordance with an instruction from the user;
Correction means for correcting the correction parameter in response to a change in the position of the point by a user;
Based on the distance between each pixel and the optical axis position detected by the detection means, the corrected parameters after correction of the specified color component are calculated using the correction parameters after correction by the correction means, and the calculated deformation is calculated. And a calculation means for setting information relating to subsequent coordinates in the processing means. Has a lens shift in the optical system,
The display device according to claim 1, wherein the detection unit detects the optical axis position from the position of the lens shift. The display device includes a zoom unit in the optical system,
A second detecting means for detecting the position of the zoom lens;
The storage means stores correction parameters at preset zoom lens positions, including the wide end and tele end of the zoom lens,
The display device according to claim 1, wherein the correction unit calculates a correction parameter corresponding to a position of the zoom lens by interpolating the plurality of correction parameters.   The display device according to claim 1, wherein the correction parameter is a function for uniquely calculating a deviation amount according to a distance from the optical axis position. The display device according to claim 1, wherein the correction parameter is discrete table data, and the calculation unit calculates coordinates by interpolating corresponding values of the table data. A display device capable of exchanging lenses,
It has a specific means for detecting the replacement of the lens, and identifying the attached lens,
The storage means stores correction parameters for each lens type,
The display device according to claim 1, wherein the correction unit performs correction based on a correction parameter corresponding to a type of lens specified by the specifying unit.

Images