WO2012160691A1 - プロジェクタおよび処理方法 - Google Patents
プロジェクタおよび処理方法 Download PDFInfo
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- WO2012160691A1 WO2012160691A1 PCT/JP2011/062081 JP2011062081W WO2012160691A1 WO 2012160691 A1 WO2012160691 A1 WO 2012160691A1 JP 2011062081 W JP2011062081 W JP 2011062081W WO 2012160691 A1 WO2012160691 A1 WO 2012160691A1
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- correction
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- video signal
- processing
- osd
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- 238000003672 processing method Methods 0.000 title description 6
- 238000000034 method Methods 0.000 claims description 45
- 230000015572 biosynthetic process Effects 0.000 claims description 18
- 238000003786 synthesis reaction Methods 0.000 claims description 18
- 238000001514 detection method Methods 0.000 claims description 14
- 230000002194 synthesizing effect Effects 0.000 claims description 8
- 238000010586 diagram Methods 0.000 description 15
- 239000004973 liquid crystal related substance Substances 0.000 description 11
- 230000003287 optical effect Effects 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000002834 transmittance Methods 0.000 description 3
- 238000003705 background correction Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3179—Video signal processing therefor
- H04N9/3182—Colour adjustment, e.g. white balance, shading or gamut
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/431—Generation of visual interfaces for content selection or interaction; Content or additional data rendering
- H04N21/4318—Generation of visual interfaces for content selection or interaction; Content or additional data rendering by altering the content in the rendering process, e.g. blanking, blurring or masking an image region
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs
- H04N21/44008—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs involving operations for analysing video streams, e.g. detecting features or characteristics in the video stream
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/47—End-user applications
- H04N21/478—Supplemental services, e.g. displaying phone caller identification, shopping application
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3179—Video signal processing therefor
- H04N9/3185—Geometric adjustment, e.g. keystone or convergence
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2340/00—Aspects of display data processing
- G09G2340/12—Overlay of images, i.e. displayed pixel being the result of switching between the corresponding input pixels
Definitions
- the present invention relates to a projector and a processing method, and more particularly to a projector and a processing method that perform OSD processing, color unevenness correction, and trapezoidal distortion correction.
- Patent Document 1 describes a projector that corrects color unevenness.
- the projector described in Patent Document 1 corrects the VT characteristic of a liquid crystal panel, a memory that holds uneven color correction data obtained from the luminance level of the display screen, an optical system for projecting light onto the display screen, and the like.
- a correction circuit a characteristic of light transmittance (T) corresponding to the amplitude (V) of the video signal, and the correction circuit corrects the VT characteristic so that it has linearity. .
- the projector described in Patent Document 1 When the projector described in Patent Document 1 receives a video signal, the projector corrects the video signal using a correction circuit, and adds color unevenness correction data held in a memory to the video signal.
- FIG. 1 is a block diagram illustrating a configuration example of a projector that performs color unevenness correction and trapezoidal distortion correction.
- the projector 90 performs OSD (On (Screen Display) processing.
- the OSD process is a process of combining, for example, OSD data representing the brightness and contrast amount of the screen with the video displayed on the screen.
- the projector 90 includes a memory 97 that holds OSD data, a video processing unit 91 that receives a video signal and performs video processing such as resolution conversion on the video signal, and an OSD that combines the OSD data with the video data subjected to the video processing.
- Color combining unit 92 trapezoidal distortion correcting unit 93 that corrects the keystone distortion of the projection screen, color unevenness correction data, and color unevenness that corrects color unevenness caused by non-uniformity in the plane of the liquid crystal panel or optical system
- the correction unit 94 receives an OSD process execution instruction by a user operation
- the CPU 96 controls the data selector 95 to output the OSD data held in the memory 97 from the data selector 95 to the OSD synthesis unit 92; It has.
- the OSD composition unit 92 accepts OSD data from the data selector 95, and synthesizes the OSD data with the video data subjected to the video processing by the video processing unit 91.
- the video data is supplied to the trapezoidal distortion correction unit 93.
- the keystone distortion correction unit 93 When the keystone distortion correction unit 93 receives the video data from the OSD synthesis unit 92, the keystone correction unit 93 performs trapezoidal distortion correction on the video data, and then the color unevenness correction unit 94 corrects the color unevenness on the video data subjected to the trapezoidal distortion correction. Perform color shading correction by combining data. Therefore, the projector 90 can correct the color unevenness caused by the liquid crystal panel and the like, and can correct the trapezoidal distortion of the projection screen.
- the color unevenness correction data can be combined with the video data by using the OSD combining unit 92 so that the color unevenness correcting unit 94 is not required.
- the trapezoidal distortion correction unit 93 performs the trapezoidal distortion correction on the video data after the color unevenness correction. Not done properly. The reason will be described with reference to FIGS. 2a to 2c.
- FIG. 2a is a diagram showing an example of color unevenness caused by the liquid crystal panel.
- FIG. 2A shows a projection screen when an image having the same color on the entire surface shown in the video signal is projected from the projector 90 onto the screen.
- the uneven color appearing in the horizontal direction is shown by different stripe patterns.
- FIG. 2b is a diagram showing color unevenness correction data for correcting the color unevenness shown in FIG. 2a.
- Different color unevenness correction data is prepared for each of the different color unevenness regions shown in FIG. 2a, and color unevenness correction is performed on the video signal using different color unevenness correction data for each region.
- the original image having the same color as the entire surface shown in the video signal is reproduced on the projection screen.
- FIG. 2c is a diagram illustrating the uneven color correction data obtained by performing the trapezoidal distortion correction on the uneven color correction data illustrated in FIG. 2b.
- the trapezoidal distortion correction unit 93 performs the trapezoidal distortion correction by keeping the lower base of the projection screen distorted into a trapezoid as Xa and reducing the upper base from Xa to Xb.
- the projector 90 shown in FIG. 1 it is possible to correct the color unevenness on the video data by using the OSD synthesis unit 92 without providing the color unevenness correcting unit 94 so that the projector has a simple configuration. is there.
- the OSD processing performed by the OSD combining unit 92 is performed before the trapezoidal distortion correction processing, if color unevenness correction is performed on the video signal using the OSD combining unit 92, the video signal after color unevenness correction is performed. Therefore, the keystone distortion correction is performed, and the uneven color correction is not appropriately performed.
- An object of the present invention is to provide a projector and a processing method with a simple configuration capable of correcting a trapezoidal distortion of a projection screen while correcting color unevenness using a processing unit that performs OSD processing.
- the projector of the present invention includes a holding unit that holds OSD data for performing OSD processing and first correction data for correcting color unevenness, and a distortion correction parameter for correcting trapezoidal distortion of a projection screen. Is received, the first correction data held in the holding means is subjected to correction processing according to the distortion correction parameter, recorded as second correction data in the holding means, and an image is obtained using the distortion correction parameter. Distortion processing means for performing trapezoidal distortion correction on a signal, and when the video signal is received, the second correction data is combined with the video signal, and when an instruction to execute the OSD processing is received, held by the holding means Combining processing means for combining the OSD data with the video signal.
- the correction method of the present invention is a correction method performed by the projector, and holds OSD data for performing OSD processing and first correction data for correcting color unevenness in a holding unit, and
- the distortion correction parameter for correcting the trapezoidal distortion is received
- the first correction data held in the holding unit is corrected according to the distortion correction parameter and recorded as the second correction data in the holding unit.
- the second correction data is combined with the video signal
- the keystone distortion correction is performed on the combined video signal using the distortion correction parameter
- an instruction to execute the OSD process is issued.
- the OSD data held in the holding means is combined with the video signal.
- FIG. 3 is a block diagram showing a configuration of the projector in the present embodiment.
- the projector 1 is a projection display device that performs OSD processing, color unevenness correction, and trapezoidal distortion correction.
- OSD On Screen Display
- a trapezoidal distortion correction parameter for correcting the trapezoidal distortion of the projection screen is input.
- the trapezoidal distortion correction parameter indicates, for example, a ratio of reducing or expanding the upper base and the lower base of the projection screen with respect to a reference value serving as a reference for the size of the projection screen.
- the projector 1 includes a processing unit 10, a trapezoidal distortion correction unit 40, a light source 51, a display unit 52, and a memory 70.
- the processing unit 10 includes a video processing unit 11, a level detection unit 12, a synthesis unit 20, a data selector 21, a CPU (Central Processing Unit) 30, and a processing selector 31.
- the memory 70 can generally be referred to as holding means.
- the memory 70 holds OSD data 71 for performing OSD processing and color unevenness correction data 72 for correcting color unevenness caused by the display unit 52.
- the OSD data 71 is data for displaying the contrast amount of the screen, for example.
- color unevenness correction data 72 for example, correction values of pixels (pixels) indicated in the video signal are shown.
- the color unevenness correction data 72 shown in FIG. 2A can be referred to as first correction data.
- Data stored in the holding area 75 in the memory 70 is input to the data selector 21.
- the memory 70 holds the color unevenness correction data for each level of the video signal as the color unevenness correction data 72.
- FIG. 4 is a diagram showing an example of color unevenness correction data held in the memory 70.
- the memory 70 holds in advance color unevenness data 1 to 4 suitable for each division range in which the gradation range of the video signal is divided into a plurality of as the color unevenness correction data 72.
- the CPU 30 is a computer that controls the data selector 21, the process selector 31, and the memory 70.
- the CPU 30 When the CPU 30 receives the trapezoidal distortion correction parameter input by the user operation, the CPU 30 supplies the process selector 31 with a reverse correction instruction signal instructing execution of the reverse correction processing on the color unevenness correction data 72.
- the process selector 31 supplies the color unevenness correction data 72 from the data selector 21 to the trapezoidal distortion correction unit 40.
- the CPU 30 when receiving the trapezoidal distortion correction parameter, supplies the data selector 21 with a color unevenness selection signal that specifies the color unevenness correction data 72.
- the CPU 30 supplies the data selector 21 with a color unevenness selection signal for designating color unevenness data one by one from the color unevenness data 1 to 4 of the color unevenness correction data 72.
- the data selector 21 outputs the color unevenness correction data 72 specified by the color unevenness selection signal to the processing selector 31.
- the CPU 30 when receiving the trapezoidal distortion correction parameter, supplies the trapezoidal distortion correction parameter to the trapezoidal distortion correction unit 40.
- the CPU 30 may supply the inverse number of the trapezoidal distortion correction parameter to the trapezoidal distortion correction unit 40 as a trapezoidal distortion correction parameter for reverse correction processing.
- the trapezoidal distortion correction unit 40 can be generally called distortion processing means.
- the trapezoidal distortion correction unit 40 When the trapezoidal distortion correction unit 40 receives the trapezoidal distortion correction parameter from the CPU 30, the trapezoidal distortion correction unit 40 performs trapezoidal distortion correction on the video signal using the trapezoidal distortion correction parameter. For example, the trapezoidal distortion correction unit 40 performs trapezoidal distortion correction that reduces the upper base of the video indicated by the video signal at a ratio indicated by the trapezoidal distortion correction parameter. The trapezoidal distortion correction unit 40 supplies the video signal subjected to the trapezoidal distortion correction to the display unit 52.
- the trapezoidal distortion correction unit 40 receives the trapezoidal distortion parameter from the CPU 30 and the color unevenness correction data 72 from the processing selector 31, the keystone distortion correction data 72 is converted into the color unevenness correction data 72 according to the trapezoidal distortion correction parameter.
- Reverse correction processing (hereinafter referred to as “reverse correction processing”) is performed.
- the trapezoidal distortion correction unit 40 performs an inverse correction process for enlarging the upper base of the color unevenness correction data 72 at a ratio of the inverse of the trapezoidal distortion correction parameter using the inverse of the trapezoidal distortion correction parameter.
- FIG. 5a is a diagram showing color unevenness correction data subjected to reverse correction processing.
- a trapezoidal distortion correction parameter indicating a ratio (Xb / Xa) for reducing the upper base of the projection image from the reference value Xa to Xb is input by a user operation.
- the trapezoidal distortion correction unit 40 Upon receiving the color unevenness correction data 72, the trapezoidal distortion correction unit 40 expands the upper base of the color unevenness correction data 72 at a ratio of the reciprocal number (Xa / Xb) of the keystone correction parameter in accordance with the trapezoidal distortion correction parameter. I do.
- the trapezoidal distortion correction unit 40 records the uneven color correction data 74 after the reverse correction processing in the memory 70.
- the CPU 30 stores only the rectangular portion of the horizontal size Xa indicated by the broken line in FIG. 5A among the color unevenness correction data 74 recorded in the memory 70 as the color unevenness correction data 73 for distortion correction in the holding area 75 in the memory 70. To record. Note that the color unevenness correction data 73 for distortion correction can be referred to as second correction data.
- FIG. 5B is a diagram showing the uneven color correction data for distortion correction generated using the uneven color correction data after the reverse correction processing shown in FIG. 5A.
- the processing unit 10 can be generally called a synthesis processing means.
- the processing unit 10 When the processing unit 10 receives the video signal, the processing unit 10 synthesizes the color unevenness correction data 72 held in the memory 70 with the video signal and corrects the color unevenness of the video signal.
- the processing unit 10 receives the video signal. Then, the level of the video signal is detected, and the color unevenness data corresponding to the detected level is combined with the video signal.
- the processing unit 10 supplies the video signal on which the color unevenness correction has been performed to the trapezoidal distortion correction unit 40.
- the trapezoidal distortion correction unit 40 performs trapezoidal distortion correction on the video signal using the trapezoidal distortion correction parameter.
- the processing unit 10 when the processing unit 10 receives an OSD processing execution instruction input by a user operation, the processing unit 10 performs an OSD processing for combining the OSD data 71 held in the memory 70 with a video signal. The processing unit 10 performs color unevenness correction on the video signal subjected to the OSD process.
- the processing unit 10 when the processing unit 10 receives an execution instruction for OSD processing, the processing unit 10 combines the OSD data with the video signal and distorts the video signal. Color unevenness correction data 73 for correction is synthesized.
- the video processing unit 11 When receiving a video signal from a video signal supply device such as a personal computer, the video processing unit 11 performs predetermined video processing on the video signal. For example, when an analog video signal is received, the video processing unit 11 converts the analog video signal into digital signal video data as predetermined video processing, and performs resolution conversion processing on the video data. The video processing unit 11 supplies the video data subjected to the resolution conversion process to the level detection unit 12 and the synthesis unit 20.
- the level detection unit 12 can be generally called detection means.
- the level detection unit 12 detects the level of the video data. For example, the level detection unit 12 detects an APL (Average Picture Level) value of a video or a plurality of videos shown in the video data. Alternatively, the level detection unit 12 may detect the level of the video data for each pixel indicated in the video data, or for each block from a predetermined number of pixels. The level detection unit 12 supplies the CPU 30 with an APL value indicating the level of the video data.
- APL Average Picture Level
- the CPU 30 When the CPU 30 receives the APL value from the level detection unit 12, the CPU 30 supplies a correction instruction signal for instructing correction of video data to the process selector 31.
- the process selector 31 When receiving the correction instruction signal, the process selector 31 supplies the video data output from the synthesis unit 20 to the trapezoidal distortion correction unit 40.
- the CPU 30 When the CPU 30 receives an OSD processing execution instruction input by a user operation, the CPU 30 controls the data selector 21 to supply the OSD data 71 held in the memory 70 from the data selector 21 to the combining unit 20. .
- the synthesizing unit 20 can be generally referred to as synthesizing means.
- the synthesizing unit 20 When the synthesizing unit 20 receives the video data from the video processing unit 11 and receives the OSD data from the data selector 21, the synthesizing unit 20 performs OSD processing for synthesizing the OSD data with the video data.
- OSD processing for synthesizing the OSD data with the video data.
- an alpha calculator that performs alpha blending OSD processing is used as the combining unit 20.
- FIG. 6 is a block diagram illustrating a configuration of the processing unit 10 that performs OSD processing.
- the video processing unit 11, the data selector 21, the CPU 30, the memory 70 that holds the OSD data 71, and the alpha calculator 200 that is used as the synthesis unit 20 are used.
- OSD data 71 for example, plane data 1 to 4 of OSD planes used for each of four applications are stored in advance.
- the video processing unit 11 receives the video data and supplies the video data on which the predetermined video processing has been performed to the first input terminal A of the alpha calculator 200.
- the data selector 21 supplies one plane data selected from the plane data 1 to 4 to the second input terminal B of the alpha calculator 200 according to the control of the CPU 30.
- the CPU 30 When the CPU 30 receives an execution instruction for OSD processing, the CPU 30 supplies an OSD selection signal for designating plane data specified by the execution instruction to the data selector 21, and the data selector 21 is designated by the OSD selection signal. Output plain data.
- the CPU 30 supplies an alpha value indicating the transmittance of the plane data to be combined with the video data to the third input terminal ⁇ of the alpha calculator 200.
- the alpha computing unit 200 is an arithmetic circuit used in the synthesizing unit 20 that performs alpha blending OSD processing.
- the alpha calculator 200 receives video data from the first input terminal A, receives plane data from the second input terminal B, and receives an alpha value from the third input terminal ⁇ .
- the alpha calculator 200 then combines the plane data B with the video data A with the transmittance indicated by the alpha value ⁇ .
- FIG. 7 is a diagram showing a detailed configuration of the alpha calculator 200.
- the alpha calculator 200 includes an adder 211, multipliers 221 and 222, and a subtractor 231.
- the subtracter 231 When the subtractor 231 receives the alpha value ⁇ from the third input terminal, the subtracter 231 supplies the subtracted value (1 ⁇ ) obtained by subtracting the alpha value ⁇ from “1” to the multiplier 221.
- the multiplier 221 When the multiplier 221 receives the video data A from the first input terminal and receives the subtraction value (1- ⁇ ) from the subtractor 231, the multiplier 221 multiplies the video data A by the subtraction value (1- ⁇ ) (first multiplication value (1 ⁇ )). A ⁇ (1 ⁇ )) is supplied to the adder 211.
- the multiplier 222 When the multiplier 222 receives the plane data B from the second input terminal and receives the alpha value ⁇ from the third input terminal, the multiplier 222 adds a second multiplication value (B ⁇ ⁇ ) obtained by multiplying the plane data B by the alpha value ⁇ . 211.
- the adder 211 When the adder 211 receives the first multiplication value from the multiplier 211 and receives the second multiplication value from the multiplier 212, the adder 211 adds the first multiplication value and the second multiplication value and outputs the video data Y.
- the alpha calculator 200 outputs the video data Y that has been subjected to the OSD processing using the following equation.
- the color correction is performed by synthesizing, for example, the color correction data 73 for distortion correction with the video data on which the OSD process has been performed.
- the synthesis unit 20 performs color unevenness correction using the alpha calculator 200 shown in FIG.
- FIG. 8 is a block diagram illustrating a configuration of the processing unit 10 that performs color unevenness correction using the alpha calculator 200. Since the configuration other than the alpha computing unit 200 is the same as that shown in FIG. 3, the same reference numerals are given and detailed description thereof is omitted here.
- color unevenness data 1 to 4 suitable for each divided range in which the range of the APL value of the video signal is divided into four stages are stored in advance as color unevenness correction data 73 for distortion correction.
- the video processing unit 11 When receiving the video signal, the video processing unit 11 supplies the video data on which the predetermined video processing has been performed to the second input terminal B of the alpha calculator 200.
- the CPU 30 When the CPU 30 receives the APL value from the level detection unit 12, the CPU 30 supplies the data selector 21 with a color unevenness specifying signal for specifying the color unevenness data of the divided range including the APL value.
- the data selector 21 Upon receipt of the color unevenness designation signal, the data selector 21 performs alpha calculation on one color unevenness data designated by the color unevenness designation signal from among the color unevenness data 1 to 4 of the color unevenness correction data 73 for distortion correction. Is supplied to the third input terminal ⁇ of the container 200.
- the alpha calculator 200 receives “0” from the first input terminal A, video data from the second input terminal B, and color unevenness data from the third input terminal ⁇ . For this reason, in the alpha calculator 200, the multiplier 222 shown in FIG. 7 multiplies the video data input to the second input terminal B by the color unevenness correction data input to the third input terminal ⁇ to generate a video. Perform color shading correction on data.
- FIG. 5c is a diagram illustrating video data obtained by performing trapezoidal distortion correction on the color unevenness correction data illustrated in FIG. 5b.
- the trapezoidal distortion correction unit 40 supplies the video data subjected to the trapezoidal distortion correction to the display unit 52.
- the light source 51 generates light and emits the light to the display unit 52.
- the display unit 52 When receiving the video data from the trapezoidal distortion correcting unit 40, the display unit 52 modulates the light emitted from the light source 51 according to the video data, and projects the modulated image light onto the screen.
- the display unit 52 includes, for example, a liquid crystal panel that modulates light from the light source 51 in accordance with video data, and an optical element such as a projection lens that projects light modulated by the liquid crystal panel onto a screen.
- FIG. 9 is a flowchart illustrating an example of a processing procedure of a method for processing color unevenness correction data.
- the memory 70 holds the color unevenness data 1 to 4 shown in FIG. 4 as the color unevenness correction data 72 when the trapezoidal distortion correction is not performed.
- the CPU 30 uses, as the trapezoidal distortion correction parameters input by the user operation, a lower base parameter in which the lower base size of the projection image distorted into a trapezoid is “Xa”, and an upper base in which the upper base size is “Xb / Xa”. Accept parameters. For this reason, as shown in FIG. 5c, the trapezoidal distortion correction unit 40 performs the trapezoidal distortion correction while keeping the size of the lower base of the projected image as Xa and reducing the size of the upper base from Xa to Xb.
- the CPU 30 when receiving a trapezoidal distortion correction parameter input by a user operation, supplies a reverse correction instruction signal for instructing execution of reverse correction processing to the color unevenness correction data 72 to the process selector 31.
- the process selector 31 can supply the data output from the data selector 21 to the trapezoidal distortion correction unit 40 (step S901).
- the CPU 30 supplies the lower base parameter (Xa) and the reciprocal number of the upper base parameter (Xa / Xb) to the trapezoidal distortion correction unit 40 as trapezoidal distortion correction parameters for performing the reverse correction processing (step S902).
- the CPU 30 supplies the data selector 21 with a color unevenness selection signal for designating the color unevenness data 1 out of the color unevenness data 1 to 4 in the memory 70.
- the data selector 21 outputs the color unevenness data 1 specified by the color unevenness selection signal to the trapezoidal distortion correction unit 40 via the processing selector 31 (step S903).
- the trapezoidal distortion correction unit 40 When the trapezoidal distortion correction unit 40 receives the trapezoidal distortion correction parameter for the reverse correction process and receives the color unevenness data 1, the trapezoidal distortion correction unit 40 performs the reverse correction process on the color unevenness data 1, for example, the reverse correction process as illustrated in FIG. Later color unevenness data 1 is generated.
- the trapezoidal distortion correction unit 40 records the uneven color data 1 after the reverse correction processing in the memory 70 (step S904).
- the CPU 30 copies only the rectangular portion of the horizontal size Xa shown in FIG. 5a in the uneven color data 1 after the reverse correction processing to another holding area 75 in the memory 70 as the uneven color data 1 for distortion correction. (Step 905).
- the color unevenness data 1 processing method performed by the projector 1 is completed.
- processing similar to steps S903 to S905 is sequentially performed one by one.
- the projector 1 combines the OSD data 71, the memory 70 that holds the color unevenness correction data 72 (first correction data) for correcting the color unevenness, and the OSD data 71 into the video signal. And a processing unit 10 that performs OSD processing.
- the keystone distortion correction unit 40 receives a distortion correction parameter for correcting the keystone distortion of the projection screen, the keystone distortion correction unit 40 performs reverse correction processing on the color unevenness correction data 72 in accordance with the trapezoidal distortion correction parameter and performs color unevenness for distortion correction.
- the correction data 73 (second correction data) is recorded in the memory 70.
- the processing unit 10 When the processing unit 10 receives the video signal, the processing unit 10 multiplies the video signal by the color unevenness correction data 73 for distortion correction to perform color unevenness correction, and then the trapezoidal distortion correction unit 40 performs the video signal after the color unevenness correction.
- the trapezoidal distortion correction is performed using the trapezoidal distortion correction parameter.
- the processing unit 10 receives an instruction to execute the OSD process, the processing unit 10 adds the OSD data 71 to the video signal, synthesizes the color unevenness correction data 73 for distortion correction with the video signal, and trapezoidal distortion with the video signal.
- the correction unit 40 performs trapezoidal distortion correction.
- the projector 1 can perform color unevenness correction by combining the video signal with the color unevenness correction data using the processing unit 10 that performs OSD processing. Therefore, since the processing unit 10 performs two processes, the OSD process and the color unevenness correction, the projector 1 does not need to be provided with separate processing circuits for the OSD process and the color unevenness correction. For example, in the projector 1, it is not necessary to provide the color unevenness correction unit 94 in the projector 90 shown in FIG. Therefore, in the present embodiment, the projector 1 can have a simple configuration.
- the trapezoidal distortion correction unit 40 when the trapezoidal distortion correction unit 40 receives the trapezoidal distortion correction parameter, the color unevenness correction data 72 is subjected to reverse correction processing using the inverse of the trapezoidal distortion correction parameter, and the color unevenness correction data for distortion correction is obtained. 73 is recorded in the memory 70.
- the processing unit 10 receives the video signal, the processing unit 10 performs color unevenness correction on the video signal using the color unevenness correction data 73 for distortion correction, and then the trapezoidal distortion correcting unit 40 converts the video signal into the video signal after the color unevenness correction. Perform trapezoidal distortion correction.
- trapezoidal distortion correction is performed on the video data that has been corrected for color unevenness using the color unevenness correction data 73 that has been subjected to the reverse correction processing, and thus the color unevenness correction data after the trapezoidal distortion correction is held in the memory 70. It becomes the same shape as the uneven color correction data 72.
- the uneven color correction data after trapezoidal distortion correction shown in FIG. 5c has the same shape as the uneven color correction data 72 shown in FIG. 2b. Therefore, the projector 1 can appropriately perform color unevenness correction on the video signal.
- the projector 1 can correct color unevenness even when color unevenness correction is performed on a video signal using the processing unit 10 that performs OSD processing before trapezoidal distortion correction. Therefore, in the present embodiment, it is possible to realize a projector having a simple configuration capable of correcting the trapezoidal distortion of the projection screen while correcting the color unevenness using the processing unit 10.
- the color unevenness correction data 72 is held in the memory 70 for each level of the video signal, and the trapezoidal distortion correction unit 40 performs a reverse correction process on each of the color unevenness correction data 72 to perform distortion.
- Each of the color unevenness correction data 73 for correction is recorded in the memory 70.
- the processing unit 10 includes a level detection unit 12 that detects the level of the video signal and a synthesis unit 20, and when the synthesis unit 20 receives the video signal, the color unevenness correction data 73 for distortion correction includes: Color unevenness correction data corresponding to the level detected by the level detector 12 is combined with the video signal.
- the projector 1 can perform color unevenness correction suitable for the level of the video signal. Therefore, the color unevenness caused by the display unit 52 can be corrected more appropriately.
- the vertical trapezoidal distortion correction process for correcting the trapezoidal distortion of the projection screen distorted in the horizontal direction of the projection screen has been described.
- the trapezoidal distortion of the projection screen distorted in the vertical direction is described.
- the present invention can also be applied to a projector that performs horizontal trapezoidal distortion correction that corrects.
- the illustrated configuration is merely an example, and the present invention is not limited to the configuration.
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Abstract
Description
図3に戻り、合成部20は、映像データにOSD処理を行うと、OSD処理が行われた映像データに、例えば歪補正用の色むら補正データ73を合成して色むら補正を行う。本実施形態では、合成部20は、図7に示したアルファ演算器200を用いて色むら補正を行う。
10 処理部
11 映像処理部
12 レベル検出部
20 合成部
21 データ選択器
30 CPU
31 処理選択器
40 台形歪補正部
51 光源
52 表示部
70 メモリ
200 アルファ演算器
211 加算器
221、222 乗算器
231 減算器
Claims (6)
- OSD処理を行うためのOSDデータと、色むらを補正するための第1の補正データと、を保持する保持手段と、
投射画面の台形歪を補正するための歪補正パラメータを受け付けると、前記保持手段に保持された第1の補正データに該歪補正パラメータに応じて補正処理を行って第2の補正データとして前記保持手段に記録し、前記歪補正パラメータを用いて映像信号に台形歪補正を行う歪処理手段と、
前記映像信号を受け付けると、前記第2の補正データを該映像信号に合成し、前記OSD処理の実行の指示を受け付けると、前記保持手段に保持されたOSDデータを前記映像信号に合成する合成処理手段と、を含むプロジェクタ。 - 請求項1に記載のプロジェクタにおいて、
前記保持手段は、前記映像信号のレベルごとに前記第1の補正データを保持し、
前記歪処理手段は、前記歪補正パラメータを受け付けると、前記第1の補正データのそれぞれに前記歪補正パラメータに応じて前記補正処理を行って前記第2の補正データとしてそれぞれ前記保持手段に記録し、
前記合成処理手段は、
前記映像信号のレベルを検出する検出手段と、
前記映像信号を受け付けると、前記第2の補正データのうち、前記検出手段が検出した映像信号のレベルに応じた第2の補正データを該映像信号に合成する合成手段と、を含む、プロジェクタ。 - 請求項1または2に記載のプロジェクタにおいて、
前記歪処理手段は、前記歪補正パラメータを受け付けると、該歪補正パラメータを用いて前記台形歪補正を行い、該歪補正パラメータの逆数を用いて前記補正処理を行う、プロジェクタ。 - 請求項1から3項のいずれか1項に記載のプロジェクタにおいて、
前記合成処理手段は、前記映像信号を受け付けると、前記第2の補正データを前記映像信号に乗算し、前記OSD処理の実行の指示を受け付けると、前記OSDデータを前記映像信号に加算する、プロジェクタ。 - プロジェクタが行う補正方法であって、
OSD処理を行うためのOSDデータと、色むらを補正するための第1の補正データと、を保持手段に保持し、
投射画面の台形歪を補正するための歪補正パラメータを受け付けると、前記保持手段に保持された第1の補正データを該歪補正パラメータに応じて補正処理を行って第2の補正データとして前記保持手段に記録し、
映像信号を受け付けると、前記第2の補正データを前記映像信号に合成し、前記合成された映像信号に前記歪補正パラメータを用いて台形歪補正を行い、前記OSD処理の実行の指示を受け付けると、前記保持手段に保持されたOSDデータを前記映像信号に合成する、補正方法。 - 請求項5に記載の補正方法において、
前記補正データを前記保持手段に保持することは、
前記映像信号のレベルごとに前記第1の補正データを前記保持手段に保持することを含み、
前記第1の補正データに前記補正処理をすることは、
前記保持手段に保持された第1の補正データのそれぞれに前記歪補正パラメータを用いて前記補正処理を行って前記第2の補正データとしてそれぞれ前記保持手段に記録することを含み、
前記第2の補正データを前記映像信号に合成することは、
前記映像信号を受け付けると、該映像信号のレベルを検出し、前記第2の補正データのうち、前記検出したレベルに応じた第2の補正データを該映像信号に合成することを含む、補正方法。
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Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000330507A (ja) * | 1999-05-21 | 2000-11-30 | Seiko Epson Corp | 投射型表示装置 |
JP2003319292A (ja) * | 2002-04-22 | 2003-11-07 | Mitsubishi Electric Corp | 投写型映像表示装置 |
JP2004304265A (ja) * | 2003-03-28 | 2004-10-28 | Seiko Epson Corp | 画像処理システム、プロジェクタ、プログラム、情報記憶媒体および画像処理方法 |
JP2006087037A (ja) * | 2004-09-17 | 2006-03-30 | Sharp Corp | プロジェクタ |
JP2009300961A (ja) * | 2008-06-17 | 2009-12-24 | Canon Inc | 投写型表示装置 |
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2011
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Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000330507A (ja) * | 1999-05-21 | 2000-11-30 | Seiko Epson Corp | 投射型表示装置 |
JP2003319292A (ja) * | 2002-04-22 | 2003-11-07 | Mitsubishi Electric Corp | 投写型映像表示装置 |
JP2004304265A (ja) * | 2003-03-28 | 2004-10-28 | Seiko Epson Corp | 画像処理システム、プロジェクタ、プログラム、情報記憶媒体および画像処理方法 |
JP2006087037A (ja) * | 2004-09-17 | 2006-03-30 | Sharp Corp | プロジェクタ |
JP2009300961A (ja) * | 2008-06-17 | 2009-12-24 | Canon Inc | 投写型表示装置 |
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