WO2015173948A1 - 映像補正装置、表示装置、及び映像補正方法 - Google Patents
映像補正装置、表示装置、及び映像補正方法 Download PDFInfo
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T11/00—2D [Two Dimensional] image generation
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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0238—Improving the black level
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- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0242—Compensation of deficiencies in the appearance of colours
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- G—PHYSICS
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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0285—Improving the quality of display appearance using tables for spatial correction of display data
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2380/00—Specific applications
- G09G2380/08—Biomedical applications
Definitions
- the present invention relates to a video correction device, a display device, and a video correction method.
- Display devices used in medical and graphic design operations are required to have numerically accurate color reproduction.
- the white level is adjusted by adjusting the luminance of the backlight
- the black level is adjusted by adjusting the offset of the video signal.
- the target values for the black level and the white level are set by the user.
- a display unevenness correction amount can be set, and the display unevenness is corrected using the display unevenness correction amount. It has been proposed (see, for example, Patent Document 1).
- the black level, white level, and display unevenness correction amount set by the user are related to each other. For this reason, in the invention described in Patent Document 1, when the display unevenness correction amount is changed after the white level and the black level are determined, the white level and the black level will fluctuate. Therefore, the user needs to repeatedly adjust the white level setting, the black level setting, and the display unevenness correction amount setting. Further, in the invention described in Patent Document 1, when the white level and the black level are changed after the display unevenness correction amount is determined, the range in which the white level and the black level can be changed is narrowed because the display unevenness correction amount is corrected. In order to achieve a well-balanced setting, the user has to repeatedly adjust the white level setting, the black level setting, and the display unevenness correction amount setting. As described above, in the invention described in Patent Document 1, since it is difficult to determine a well-balanced set value, there is a problem that it is difficult to correct display unevenness according to the user's preference. .
- the present invention has been made in view of the above problems, and an object of the present invention is to provide a video correction device, a display device, and a video correction method capable of correcting display unevenness in accordance with user preferences. It is said.
- an image correction apparatus has a non-correction uneven characteristic that is a characteristic of luminance unevenness of a display panel without correction, and the non-correction uneven characteristic in the first gradation.
- a first target unevenness characteristic calculating unit that calculates a first target unevenness characteristic based on a certain first non-correction unevenness characteristic and a correction amount calculated based on a backlight drive value and a black level;
- a second target unevenness characteristic is calculated based on the second uncorrected unevenness characteristic which is the uncorrected unevenness characteristic in the second gradation different from the first gradation, and the backlight driving value.
- the target non-uniformity characteristic calculation unit Based on the target non-uniformity characteristic calculation unit, the first non-correction non-uniformity characteristic, the second non-correction non-uniformity characteristic, the first target non-uniformity characteristic, and the second target non-uniformity characteristic, Generation of correction data for generating correction data for each gradation to be corrected And, equipped with a.
- a display device has a non-correction unevenness characteristic that is a characteristic of brightness unevenness of a display panel that displays an image and a non-corrected display panel, and has a first gradation.
- a first target that calculates a first target unevenness characteristic based on the first non-correction unevenness characteristic that is the uncorrected unevenness characteristic and the correction amount that is calculated based on the backlight drive value and the black level.
- the second target A second target non-correction non-correction characteristic, the second non-correction non-uniformity characteristic, the first target non-uniformity characteristic, the second target non-uniformity characteristic, Correction data for each gradation to correct the video signal based on Comprising a correction data generation unit to be generated, a.
- an image correction method is a non-correction non-correction characteristic that is a characteristic of luminance unevenness of a display panel when no correction is performed, and the non-correction non-correction characteristic in the first gradation.
- a first target unevenness characteristic calculation procedure for calculating a first target unevenness characteristic based on a certain first non-correction unevenness characteristic and a correction amount calculated based on a backlight drive value and a black level;
- a second target unevenness characteristic is calculated based on the second uncorrected unevenness characteristic which is the uncorrected unevenness characteristic in the second gradation different from the first gradation, and the backlight driving value.
- Correction data for generating correction data for each gradation to be corrected Including the formation procedure, the.
- display unevenness can be corrected according to the user's preference.
- 1 is a schematic configuration diagram of a display system according to a first embodiment. It is a figure explaining the example from which a screen nonuniformity characteristic differs for every gradation. It is a figure explaining an example of the white nonuniformity characteristic of the video display part which concerns on 1st Embodiment. It is a figure explaining an example of the black nonuniformity characteristic of the image
- FIG. 1 is a schematic configuration diagram of a display system 1 according to the present embodiment.
- the display system 1 includes a video correction device 2, a backlight 3, a video input unit 4, an unevenness correction 3DLUT 5, and a video display unit 6.
- the backlight 3 is a light source that emits light according to a drive signal output from the video correction device 2.
- the backlight 3 is, for example, a white LED (light emitting diode), a three-color LED, a cold cathode fluorescent lamp (CCFL), a hot cathode fluorescent lamp (HCFL), an electroluminescence panel (ELP), or the like.
- the video input unit 4 outputs a video signal input from a video output device such as a PC (personal computer) to the video correction device 2.
- the input video signal is, for example, a video signal of DVI (Digital Visual Interface) standard, a video signal of HDMI (registered trademark; High-Definition Multimedia interface) standard, VGA (Video Graphics). Array; video graphics array) standard video signal.
- the input video signal may be an analog signal.
- a 3DLUT (3D look-up table) is set by the video correction device 2.
- the unevenness correction 3DLUT 5 corrects the video signal input from the video correction device 2 using the set 3DLUT, and causes the video display unit 6 to display the corrected video signal.
- an unevenness correction value stored in the unevenness correction data storage unit 202 is set as an initial value.
- This correction value is an independent value for each color (for example, R, G, B), for each gradation (for example, 255, 192, 128, 64, 0) and for each position (for example, y-axis 20 points, x-axis 11 points). It is.
- the y axis is the longitudinal direction and the x axis is the short direction.
- the video display unit 6 displays the video signal output from the unevenness correction 3DLUT 5.
- the video display unit 6 is a liquid crystal panel, for example.
- the display element mounted on the video display unit 6 is a display element other than a liquid crystal type, for example, an organic electroluminescence display element, an inorganic electroluminescence display element, PALC (Plasma Address Liquid Crystal), PDP (Plasma Display Panel). ) Or FED (Field Emission Display).
- the video correction device 2 includes a backlight control unit 201, unevenness correction data storage unit 202, luminance unevenness characteristic calculation unit 203, black unevenness correction amount calculation unit 204, first target unevenness characteristic calculation unit 205, and second target unevenness characteristic calculation unit. 206, a correction data generation unit 207, a determination unit 208, and a superimposition unit 209.
- a value indicating a white level is input to the backlight control unit 201.
- the backlight control unit 201 generates a backlight drive value 101 that is proportional to the value indicating the input white level.
- the backlight control unit 201 outputs the generated backlight drive value 101 to the backlight 3, the black unevenness correction amount calculation unit 204, and the second target unevenness characteristic calculation unit 206.
- the value indicating the white level is, for example, the luminance [cd (candela) / m 2 ] of white displayed on the video display unit 6, and is a value set by the user or preset in the display system 1. This is the initial value.
- a value indicating the white level is, for example, 200 [cd / m 2 ].
- the backlight drive value is, for example, a current value or a pulse duty ratio value.
- the unevenness correction data storage unit 202 stores unevenness correction data for each gradation set in advance.
- the unevenness correction data storage unit 202 stores unevenness correction data of 0, 64, 128, 192, and 255 gradations.
- 0 gradation corresponds to black and 255 gradation corresponds to white.
- the gradation may be 12 bits or 16 bits.
- the unevenness correction data is determined so as to have the same screen unevenness characteristics in all display gradations based on, for example, a two-dimensional distribution (unevenness characteristics) acquired by an image sensor (not shown) at the time of manufacturing the display system 1.
- a state in which the display gradation is corrected to have the same screen unevenness characteristic is referred to as a state in which the unevenness correction amount is 100%, and a state in which this correction is not performed is referred to as a state in which the unevenness correction amount is 0%.
- the unevenness correction amount is a parameter representing how much the unevenness characteristic is corrected. This unevenness correction amount is input through a user interface, for example.
- the unevenness correction data is the gradation correction value of each point in the video display unit 6 determined so as to have the same screen unevenness characteristic in all display gradations.
- the unevenness characteristic of the white screen may be set freely. However, it is desirable that the unevenness characteristics below the intermediate gradation are made the same as the unevenness characteristics of the white screen. If the unevenness characteristic is changed for each gradation without performing this, color unevenness may occur at the time of light color display when the gamma curves in the screen are not aligned, or the display quality standard (medical DICOM) may not be satisfied.
- FIG. 2 is a diagram for explaining an example in which screen unevenness characteristics differ for each gradation.
- the horizontal axis represents the position in the screen of the video display unit 6, and the vertical axis represents the display luminance.
- a curve g131 is luminance unevenness in 255 gradations
- a curve g132 is luminance unevenness in 128 gradations.
- an arrow g133 is a luminance difference between the 255th gradation and the 128th gradation in the center of the screen
- an arrow g134 is a luminance difference between the 255th gradation and the 128th gradation on the left side of the screen.
- the reason why the color unevenness occurs depending on the position is that the R (red) luminance ratio with respect to the G (green) and B (blue) luminance changes for each screen position.
- control is performed so that all gradations are adjusted to the same unevenness characteristic.
- the unevenness characteristic at the 0th gradation and the unevenness characteristic at the 255th gradation are combined, the unevenness characteristic is also the same for the gradations generated by complementation as described later.
- the brightness unevenness characteristic calculation unit 203 reads the unevenness correction data of each gradation stored in the unevenness correction data storage unit 202, and uses the read unevenness correction data of each gradation to make the panel brightness unevenness at the time of no correction of each gradation.
- the characteristic 102 is calculated.
- the luminance unevenness characteristic calculation unit 203 may calculate the unevenness characteristic without correction by performing luminance conversion of a correction value on the read unevenness correction data.
- the luminance unevenness characteristic calculation unit 203 supplies the first target unevenness characteristic calculation unit 205 with the non-correction luminance unevenness characteristic (also referred to as 0 gradation panel luminance unevenness characteristic) at the calculated 0 gradation as shown in FIG. Output.
- the luminance unevenness characteristic calculation unit 203 supplies the non-corrected luminance unevenness characteristic (also referred to as 255 gradation panel luminance unevenness characteristic) to the second target unevenness characteristic calculation unit 206 as shown in FIG. Output. Further, the luminance unevenness characteristic calculation unit 203 outputs to the correction data generation unit 207 the luminance unevenness characteristic without correction at the calculated 0 gradation to 255 gradation.
- FIG. 3 is a diagram for explaining an example of white unevenness characteristics of the video display unit 6 according to the present embodiment.
- FIG. 4 is a diagram illustrating an example of black unevenness characteristics of the video display unit 6 according to the present embodiment.
- the horizontal axis is the coordinate in the x-axis direction in the video display unit 6
- the axis in the depth direction is the coordinate in the y-axis direction in the video display unit 6
- the vertical axis is the video display unit. 6 screen luminance [cd / m 2 ].
- this characteristic is measured at the time of shipment by an image pickup device shown in the figure, and unevenness correction data for correcting the unevenness of brightness shown in FIG. 3 is stored in the unevenness correction data storage unit 202.
- the luminance unevenness characteristic at the 255 gradation calculated by the luminance unevenness characteristic calculation unit 203 is the one shown in FIG.
- the luminance unevenness characteristic at the 0th gradation calculated by the luminance unevenness characteristic calculation unit 203 becomes a characteristic as shown in FIG.
- the unevenness correction data storage unit 202 may store display unevenness data for each gradation at the time of no correction.
- the luminance unevenness characteristic calculation unit 203 outputs the luminance unevenness characteristic at the time of 0 gradation stored in the unevenness correction data storage unit 202 without correction to the first target unevenness characteristic calculation unit 205 to output the 255th floor.
- the luminance unevenness characteristic at the time of tone adjustment without correction may be output to the second target unevenness characteristic calculation unit 206.
- the luminance unevenness characteristic calculation unit 203 outputs the luminance unevenness characteristic at the time of each of 0 gradation to 255 gradation stored in the unevenness correction data storage unit 202 to the correction data generation unit 207 without correction. May be.
- the black unevenness correction amount calculation unit 204 calculates a target black unevenness correction amount 103 based on the set black level and the backlight drive value 101 input from the backlight control unit 201.
- This target black unevenness correction amount 103 is a parameter representing how much the luminance unevenness characteristic at the time of 0 gradation is corrected without correction.
- the black level is, for example, 1 [cd / m 2 ].
- the black unevenness correction amount calculation unit 204 calculates, for example, a characteristic that is proportional to the black level and inversely proportional to the backlight drive value.
- the black unevenness correction amount calculation unit 204 outputs the calculated target black unevenness correction amount 103 to the first target unevenness characteristic calculation unit 205.
- FIG. 5 is a diagram for explaining an example of the black unevenness correction amount according to the present embodiment.
- the horizontal axis represents the backlight driving value
- the vertical axis represents the black unevenness correction amount.
- a curve g141 is a black unevenness correction amount with respect to a backlight drive value having a maximum black level that can be set
- a curve g142 is a black unevenness correction amount with respect to a backlight drive value having a minimum black level that can be set.
- the black level by the user is selected between the curve g141 and the curve g142.
- a numerical value of luminance [cd / m 2 ] is selected or input as the black level setting value by the user.
- a black unevenness correction amount curve or an equation representing the curve based on the backlight driving value and the set black level is stored in the black unevenness correction amount calculation unit 204 in advance by actual measurement, simulation, or the like.
- the black unevenness correction amount calculation unit 204 calculates a black unevenness correction amount using a stored curve or an equation representing a curve based on the backlight drive value and the set black level.
- the first target unevenness characteristic calculation unit 205 is based on the target black unevenness correction amount 103 input from the black unevenness correction amount calculation unit 204 and the 0 gradation panel luminance unevenness characteristic 102 input from the luminance unevenness characteristic calculation unit 203.
- a target unevenness characteristic at 0 gradation (hereinafter referred to as 0 gradation target unevenness characteristic) 105 is calculated.
- the first target unevenness characteristic calculation unit 205 replaces the brightness value lower than the target black unevenness correction amount 103 in the 0 gradation panel luminance unevenness property 102 with the target black unevenness correction amount 103, thereby obtaining the 0 gradation target unevenness.
- the characteristic 105 is calculated.
- the first target unevenness characteristic calculation unit 205 outputs the calculated 0 gradation target unevenness characteristic 105 to the correction data generation unit 207 and the determination unit 208.
- FIG. 6 is a diagram for explaining an example of black unevenness characteristics at 0.1 [cd / m 2 ] according to the present embodiment.
- FIG. 7 is a diagram for explaining an example of black unevenness characteristics at 0.4 [cd / m 2 ] according to the present embodiment.
- FIG. 8 is a diagram for explaining an example of black unevenness characteristics at 0.6 [cd / m 2 ] according to the present embodiment.
- Each axis in FIGS. 6 to 8 is the same as that in FIGS.
- the characteristics shown in FIG. 6 are black unevenness characteristics when the black level is set to 0.1 [cd / m 2 ] by the user.
- the luminance unevenness of the panel is higher than the black level set by the user.
- the first target unevenness characteristic calculation unit 205 compares the flat characteristic with the characteristic shown in FIG.
- the first target unevenness characteristic calculation unit 205 employs the black unevenness characteristic having a higher value than the flat characteristic as the target characteristic. For example, in the case of the screen brightness having the characteristics shown in FIG. 6 higher than the flat characteristics, all of the high screen brightness becomes the target characteristics.
- the characteristics shown in FIG. 7 are black unevenness characteristics when the black level is set to 0.4 [cd / m 2 ] by the user.
- the example shown in FIG. 6 is an example in which the black unevenness of the panel and the target characteristics are overlapped by about half.
- the first target unevenness characteristic calculation unit 205 selects the higher one of the overlapping values, that is, the luminance higher than the flat plane g151 is adopted as the target characteristic.
- the characteristics shown in FIG. 8 are black unevenness characteristics when the black level is set to 0.6 [cd / m 2 ] by the user.
- the first target unevenness characteristic calculation unit 205 selects the plane g161 having a higher characteristic, that is, a flat characteristic.
- the second target unevenness characteristic calculation unit 206 is based on the backlight driving value 101 input from the backlight control unit 201 and the 255 gradation panel luminance unevenness characteristic 102 input from the luminance unevenness characteristic calculation unit 203.
- a target unevenness characteristic (hereinafter referred to as 255 gradation target unevenness characteristic) 106 in gradation is calculated.
- the second target unevenness characteristic calculation unit 206 calculates the 255 gradation target unevenness correction amount so as to have a characteristic that is inversely proportional to the input backlight drive value 101.
- the second target unevenness characteristic calculation unit 206 sets the unevenness correction amount to 100% when the backlight drive value is low, and sets the unevenness correction amount to 0% (unevenness correction is off) when the backlight drive value is maximum. A 255 gradation target unevenness correction amount having such characteristics as to be reduced is calculated. In this embodiment, it is assumed that the unevenness characteristic is the same as that in FIG.
- the second target unevenness characteristic calculation unit 206 outputs the calculated 255 gradation target unevenness characteristic 106 to the correction data generation unit 207 and the determination unit 208.
- the unevenness correction amount is set to decrease as the white level set by the user increases.
- the unevenness correction amount is 100%
- the 255 gradation target unevenness correction amount is a value set during production.
- the unevenness correction amount is 0%
- the 255 gradation target unevenness correction amount is that the unevenness correction is off.
- the correction amount between 0% and 100% is calculated by complementing, for example, from the characteristics of 0% and 100%.
- the correction data generation unit 207 includes a target unevenness characteristic generation unit 2071 and an unevenness correction data output unit 2072.
- the target unevenness characteristic generation unit 2071 includes the 0 gradation target unevenness characteristic 105 input from the first target unevenness characteristic calculation unit 205 and the 255 gradation target unevenness characteristic 106 input from the second target unevenness characteristic calculation unit 206. By using this, the target unevenness characteristic between 0 and 255 gradations is generated.
- the target unevenness characteristic generation unit 2071 complements the 0 gradation target unevenness characteristic 105 and the 255 gradation target unevenness characteristic 106 to generate a target unevenness characteristic between 0 and 255 gradations.
- a method such as BiCubic or spline is used.
- the target unevenness characteristic generation unit 2071 outputs the generated target unevenness characteristic between 0 to 255 gradations to the unevenness correction data output unit 2072.
- the unevenness correction data output unit 2072 includes a target unevenness characteristic between 0 and 255 gradations input from the target unevenness characteristic generation unit 2071 and a panel brightness unevenness between 0 and 255 gradations input from the brightness unevenness characteristic calculation unit 203.
- the characteristic 102 is compared with each gradation to generate unevenness correction data for each gradation.
- the unevenness correction data output unit 2072 sets the generated unevenness correction data for each gradation in the unevenness correction 3DLUT5.
- the determination unit 208 compares the 0 gradation target unevenness characteristic 105 input from the first target unevenness characteristic calculation unit 205 with the 255 gradation target unevenness characteristic 106 input from the second target unevenness characteristic calculation unit 206, and Generate information indicating match or mismatch.
- the determination unit 208 outputs the generated information to the superimposition unit 209. Note that the determination unit 208 may determine that the correction amounts match if they are within a predetermined allowable range.
- the superimposing unit 209 superimposes the information input from the determination unit 208 on the video signal input from the video input unit 4, and outputs the video signal on which the information is superimposed to the unevenness correction 3DLUT 5.
- the superimposing unit 209 warns that when information indicating inconsistency is input, there is a difference in unevenness characteristics between gradations, and any part (coordinates) in the screen does not match the target black level. Is generated and information indicating the generated warning is superimposed on the video signal. That is, in this embodiment, when the white level and the black level set by the user can be realized, a warning is not displayed, and a warning is displayed when it cannot be realized.
- the reason for displaying the warning in this way is that when the unevenness characteristics of the previous gradation are not the same, color unevenness occurs as described with reference to FIG. 2, or the display quality standard such as medical DICOM cannot be satisfied. This is because a defect may occur.
- FIG. 9 is a flowchart of the processing procedure of the video correction apparatus 2 according to the present embodiment.
- unevenness correction data is set in advance in the unevenness correction data storage unit 202 and the unevenness correction 3DLUT 5, and the white level and the black level are set by the user.
- Step S1 The backlight control unit 201 generates a backlight drive value 101 that is proportional to the value indicating the input white level. Next, the backlight control unit 201 outputs the generated backlight drive value 101 to the backlight 3, the black unevenness correction amount calculation unit 204, and the second target unevenness characteristic calculation unit 206.
- Step S ⁇ b> 2 The luminance unevenness characteristic calculation unit 203 reads unevenness correction data for each gradation stored in the unevenness correction data storage unit 202. Next, the luminance unevenness characteristic calculation unit 203 calculates the panel luminance unevenness characteristic 102 when each gradation is not corrected using the read unevenness correction data of each gradation, and calculates the calculated 0 gradation gradation luminance unevenness. The output is output to the first target unevenness characteristic calculation unit 205, and the 255 gradation panel luminance unevenness characteristic is output to the second target unevenness characteristic calculation unit 206. Further, the luminance unevenness characteristic calculation unit 203 outputs to the correction data generation unit 207 the luminance unevenness characteristic without correction at the calculated 0 gradation to 255 gradation.
- Step S3 The second target unevenness characteristic calculation unit 206 converts the backlight driving value 101 input from the backlight control unit 201 and the 255 gradation panel luminance unevenness characteristic 102 input from the luminance unevenness characteristic calculation unit 203. Based on this, the 255 gradation target unevenness characteristic 106 is calculated. The second target unevenness characteristic calculation unit 206 outputs the calculated 255 gradation target unevenness characteristic 106 to the correction data generation unit 207 and the determination unit 208.
- the black unevenness correction amount calculation unit 204 calculates a target black unevenness correction amount 103 based on the set black level and the backlight drive value 101 input from the backlight control unit 201.
- the black unevenness correction amount calculation unit 204 outputs the calculated target black unevenness correction amount 103 to the first target unevenness characteristic calculation unit 205.
- the first target unevenness characteristic calculation unit 205 includes the target black unevenness correction amount 103 input from the black unevenness correction amount calculation unit 204 and the 0 gradation panel luminance unevenness characteristic input from the luminance unevenness characteristic calculation unit 203. 102, the zero gradation target unevenness characteristic 105 is calculated. The first target unevenness characteristic calculation unit 205 outputs the calculated 0 gradation target unevenness characteristic 105 to the determination unit 208 and the correction data generation unit 207.
- the target unevenness characteristic generation unit 2071 includes the 0 gradation target unevenness characteristic 105 input from the first target unevenness characteristic calculation unit 205 and the 255 gradation target unevenness input from the second target unevenness characteristic calculation unit 206. Using the characteristic 106, a target unevenness characteristic between 0 and 255 gradations is generated. The target unevenness characteristic generation unit 2071 outputs the generated target unevenness characteristic between 0 to 255 gradations to the unevenness correction data output unit 2072.
- the unevenness correction data output unit 2072 includes a target unevenness characteristic between 0 and 255 gradations input from the target unevenness characteristic generation unit 2071 and an interval between 0 and 255 gradations input from the luminance unevenness characteristic calculation unit 203.
- the panel luminance unevenness characteristic 102 is compared for each gradation, and unevenness correction data for each gradation is generated.
- the unevenness correction data output unit 2072 sets the generated unevenness correction data for each gradation in the unevenness correction 3DLUT5.
- the determination unit 208 includes the 0 gradation target unevenness characteristic 105 input from the first target unevenness characteristic calculation unit 205 and the 255 gradation target unevenness characteristic 106 input from the second target unevenness characteristic calculation unit 206. Are generated, and information indicating a match or mismatch is generated. The determination unit 208 outputs the generated information to the superimposition unit 209.
- Step S ⁇ b> 9 When the input information is information indicating a mismatch, the superimposing unit 209 generates warning information. Next, the superimposing unit 209 superimposes the generated warning information on the video signal input from the video input unit 4, and outputs the video signal on which the information is superimposed to the unevenness correction 3DLUT 5.
- FIG. 10 is a flowchart of a processing procedure performed by the determination unit 208 according to the present embodiment.
- the determination unit 208 determines each point in the screen for the 0 gradation target unevenness characteristic 105 and the 255 gradation target unevenness characteristic 106 based on the value (luminance or gradation value) at the center of the screen as a reference (100%). Normalize the value.
- the determination unit 208 compares the normalized zero gradation target unevenness characteristic 105 with the 255 gradation target unevenness characteristic 106 for each screen position. Information indicating the inconsistency is output to the superimposing unit 209 when the inconsistent point is found.
- step S4 and step S5 after step S3 was demonstrated in the example mentioned above, you may make it perform step S3 after step S4 and step S5.
- step S3 and steps S4 and S5 may be processed in parallel.
- the video correction apparatus has the non-correction unevenness characteristic that is the characteristic of the luminance unevenness of the display panel at the time of no correction, and is the first non-correction unevenness characteristic at the first gradation.
- a first target unevenness characteristic calculating unit that calculates a first target unevenness characteristic based on a non-correction unevenness characteristic, a correction amount calculated based on a backlight drive value and a black level, and a first gradation
- a second target unevenness characteristic calculating unit that calculates a second target unevenness characteristic based on a second uncorrected unevenness characteristic that is a non-correction unevenness characteristic in a second gradation different from the above, and a backlight driving value; Based on the first non-correction non-uniformity characteristic, the second non-correction non-uniformity characteristic, the first target non-uniformity characteristic, and the second target non-uniformity characteristic, the correction data for each gradation for correcting the video
- the video correction apparatus changes the unevenness characteristic on the black screen, instead of adjusting the black level by adjusting the offset of the video signal while fixing the unevenness characteristic as in the past. Adjust the black bell with.
- the target black unevenness correction amount 103 is a value calculated using not only the set black level but also the white level, the black unevenness is changed according to the target white level and black level. The characteristics are adjusted.
- the video correction apparatus of the present embodiment determines the white screen unevenness characteristic independently of the black unevenness characteristic, and has two independent black and white target unevenness characteristics.
- the unevenness characteristic of the intermediate gradation can be set for each display gradation so that the transition is continuously performed between the two characteristics.
- adjustment was made so as to obtain a common unevenness characteristic between gradations.
- the unevenness correction value can be automatically adjusted with respect to the set values of the white level and the black level by the user.
- display unevenness can be corrected according to the user's preference.
- the unevenness correction value is automatically set so that the screen unevenness is minimized while satisfying the set white / black level based on the graphic or medical user's “color reproduction accuracy” needs. Is done.
- the priority in the “accuracy of color reproduction” needs is the highest in white level, next in black level, next in white nonuniformity characteristics, and then in black nonuniformity characteristics. That is, in this embodiment, the adjustment is made in the order of the “color reproduction accuracy” needs of the graphic or medical user.
- the present embodiment if there is a screen portion that does not have the target display characteristics or there is a possibility of color unevenness, a warning can be notified to the user.
- a warning can be notified to the user.
- FIG. 11 is a schematic configuration diagram of a display system 1A according to the present embodiment according to the present embodiment.
- the same reference numerals are used for functional units having the same functions as those of the display system 1 described in the first embodiment, and description thereof is omitted.
- the display system 1A includes a video correction device 2A, a backlight 3, a video input unit 4, an unevenness correction 3DLUT 5, and a video display unit 6.
- the image correction apparatus 2A includes a backlight control unit 201, unevenness correction data storage unit 202, luminance unevenness characteristic calculation unit 203, black unevenness correction amount calculation unit 204, first target unevenness characteristic calculation unit 205, and second target unevenness characteristic calculation unit. 206, a correction data generation unit 207, a determination unit 208 ⁇ / b> A, and a superimposition unit 209.
- the correction data generation unit 207 includes a target unevenness characteristic generation unit 2071 and an unevenness correction data output unit 2072.
- the determination unit 208A includes the 0 gradation target unevenness characteristic 105 input from the first target unevenness characteristic calculation unit 205 and the 255 gradation target unevenness characteristic 106 input from the second target unevenness characteristic calculation unit 206. If they are the same value (for example, a flat characteristic as shown in FIG. 8), it is determined that they match, and if they are not the same value in the screen, they are determined not to match.
- the determination unit 208A outputs the determination result to the superimposition unit 209. Note that the determination unit 208 ⁇ / b> A may determine that the correction amounts match if they are within a predetermined allowable range.
- display unevenness can be corrected in accordance with the user's preference, as in the first embodiment. Further, according to the present embodiment, the user can be notified when there is a difference in unevenness characteristics between gradations.
- FIG. 12 is a schematic configuration diagram of a display system 1B according to this embodiment according to this embodiment.
- the same reference numerals are used for functional units having the same functions as those of the display system 1 described in the first embodiment, and description thereof is omitted.
- the display system 1B includes a video correction device 2B, a backlight 3, a video input unit 4, an unevenness correction 3DLUT 5, and a video display unit 6.
- the image correction apparatus 2A includes a backlight control unit 201, unevenness correction data storage unit 202, luminance unevenness characteristic calculation unit 203, black unevenness correction amount calculation unit 204, first target unevenness characteristic calculation unit 205, and second target unevenness characteristic calculation unit. 206, a correction data generation unit 207, a determination unit 208 ⁇ / b> B, and a superimposition unit 209.
- the correction data generation unit 207 includes a target unevenness characteristic generation unit 2071 and an unevenness correction data output unit 2072.
- the determination unit 208B reads the unevenness correction data for each gradation stored in the unevenness correction data storage unit 202, and acquires unevenness correction data between 0 and 255 gradations generated by the unevenness correction data output unit 2072. The determination unit 208B determines whether or not these two unevenness correction data match for each gradation. It is assumed that the unevenness correction data for each gradation stored in the unevenness correction data storage unit 202 is adjusted to the same characteristics for each gradation. The determination unit 208B outputs the determination result to the superimposition unit 209. It should be noted that the determination unit 208B may determine that they match if they are within a predetermined tolerance in the comparison of correction amounts.
- display unevenness can be corrected in accordance with the user's preference, as in the first embodiment. Further, according to the present embodiment, the user can be notified when there is a difference in unevenness characteristics between gradations.
- the unevenness correction data storage unit 202 stores unevenness correction data for each gradation preset at the time of shipment. I can't. Based on the results measured by the user or administrator of the display system (1, 1A, 1B), the operator performing maintenance, etc., using an imaging device (not shown) after use, gradation is stored in the unevenness correction data storage unit 202. The unevenness correction data for each may be stored.
- the example in which the video correction device (2, 2A, 2B) includes the superimposing unit 209 has been described.
- the superimposing unit 209 includes the video correcting device (2, 2A, 2B). May not be provided.
- the determination unit (208, 208A, 208B) of the video correction device (2, 2A, 2B) may output the determination result to the superimposition unit 209.
- the display system (1, 1A, 1B) has been described as an example, but the present invention is not limited to this.
- the display system (1, 1A, 1B) may be a portable terminal such as a tablet or a smartphone that displays a video signal and has a backlight.
- a program for realizing each function of the video correction apparatus (2, 2A, 2B) of FIG. 1 of the above-described embodiment is recorded on a computer-readable recording medium, and the program recorded on this recording medium is recorded.
- the processing of each unit may be performed by being read and executed by a computer system.
- the “computer system” includes an OS and hardware such as peripheral devices. Further, the “computer system” includes a homepage providing environment (or display environment) if a WWW system is used.
- the “computer-readable recording medium” is a portable medium such as a flexible disk, a magneto-optical disk, a ROM (Read Only Memory), a CD-ROM, or a USB (Universal Serial Bus) I / F (interface).
- a storage device such as a USB memory or a hard disk built in a computer system.
- the “computer-readable recording medium” includes a medium that holds a program for a certain period of time, such as a volatile memory inside a computer system serving as a server or a client.
- the program may be a program for realizing a part of the functions described above, and may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system.
- Uncorrected non-correction characteristic that is a characteristic of luminance unevenness of the display panel at the time of non-correction, the first non-correction non-correction characteristic that is the non-correction non-uniformity characteristic in the first gradation, the backlight drive value, and black
- a first target unevenness characteristic calculating unit that calculates a first target unevenness characteristic based on the correction amount calculated based on the level;
- a second target unevenness characteristic is calculated based on the second uncorrected unevenness characteristic that is the uncorrected unevenness characteristic in the second gradation different from the first gradation, and the backlight driving value.
- a video correction apparatus comprising: [Appendix 2] Based on the unevenness characteristic for each of a plurality of preset gradations for correcting display unevenness, the uncorrected unevenness characteristic for each of the plurality of gradations including the first gradation and the second gradation is calculated.
- the video correction device according to claim 1 or 2, further comprising: a correction amount calculation unit that calculates the correction amount based on a characteristic that is proportional to the black level and inversely proportional to the backlight driving value.
- the correction data generation unit Using the first target unevenness characteristic and the second target unevenness characteristic to generate a target unevenness characteristic between the first gradation and the second gradation; The correction data for each gradation for correcting the video signal by comparing the non-correction unevenness characteristic of each gradation with the generated target unevenness characteristic between the first gradation and the second gradation for each gradation.
- the video correction device according to any one of Supplementary Note 1 to Supplementary Note 3, wherein [Appendix 5] The video correction apparatus according to any one of Supplementary Note 1 to Supplementary Note 4, wherein the correction data for each gradation generated by the correction data generation unit is 3DLUT data. [Appendix 6] The video correction device according to any one of appendix 1 to appendix 5, wherein the backlight drive value is a backlight drive value according to a white level. [Appendix 7] The first target unevenness characteristic and the second target unevenness characteristic are compared, and when the first target unevenness characteristic and the second target unevenness characteristic are within a predetermined range, it is determined that they coincide with each other.
- a determination unit that determines that there is a mismatch when The video correction device according to any one of appendix 1 to appendix 6, further comprising: a superimposing unit that generates warning information when the determination result of the determination unit does not match, and superimposes the generated warning information on the video signal.
- the determination unit In the first target unevenness characteristic and the second target unevenness characteristic, the determination unit normalizes the value of each point in the display unit on the basis of the value of a predetermined position in the display unit on which the image is displayed. It is determined that the normalized first target unevenness characteristic and the second target unevenness characteristic for each point match within a predetermined range, and they do not match when outside the predetermined range.
- the image correction apparatus according to appendix 7, which determines.
- the value included in the first target unevenness characteristic and the value included in the second target unevenness characteristic are determined to match when they are within a predetermined range at a predetermined position on the display unit where the video is displayed.
- a determination unit that determines that there is a mismatch when it is outside the predetermined range;
- the video correction device according to any one of supplementary notes 1 to 6, further comprising: a superimposing unit that generates warning information when the determination result of the determination unit does not match, and superimposes the generated warning information on the video signal. .
- a value included in unevenness characteristics for each of a plurality of preset gradations for correcting display unevenness and a value included in the correction data for each gradation generated by the correction data generation unit are within a predetermined range.
- a determination unit that determines that it matches if it is within, and determines that it does not match if it is outside the predetermined range;
- the video correction device according to any one of supplementary notes 2 to 6, further comprising: a superimposing unit that generates warning information when the determination result of the determination unit does not match, and superimposes the generated warning information on the video signal. .
- a display panel for displaying images Uncorrected non-correction characteristic that is a characteristic of luminance unevenness of the display panel at the time of non-correction, the first non-correction non-correction characteristic that is the non-correction non-uniformity characteristic in the first gradation, the backlight drive value, and black
- a first target unevenness characteristic calculating unit that calculates a first target unevenness characteristic based on the correction amount calculated based on the level;
- a second target unevenness characteristic is calculated based on the second uncorrected unevenness characteristic that is the uncorrected unevenness characteristic in the second gradation different from the first gradation, and the backlight driving value.
- a correction data generation unit for generating data A display device comprising: [Appendix 12] Uncorrected non-correction characteristic that is a characteristic of luminance unevenness of the display panel at the time of non-correction, the first non-correction non-correction characteristic that is the non-correction non-uniformity characteristic in the first gradation, the backlight drive value, and black
- a second target unevenness characteristic is calculated based on the second uncorrected unevenness characteristic that is the uncorrected unevenness characteristic in the second gradation different from the first gradation, and the backlight driving value.
- Correction data generation procedure for generating data, Video correction method including
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Abstract
Description
このように、特許文献1に記載の発明では、バランスの良い設定値を決定することが困難であるため、利用者の嗜好に合わせて表示ムラを補正することが困難であるという課題があった。
図1は、本実施形態に係る表示システム1の概略構成図である。
図1に示すように、表示システム1は、映像補正装置2、バックライト3、映像入力部4、ムラ補正3DLUT5、及び映像表示部6を含んで構成される。
ムラ調節時、白画面のムラ特性は自由に設定してもよい。ただし、中間階調以下のムラ特性は白画面のムラ特性と同一に揃えることが望ましい。これを行わず、階調ごとにムラ特性を変化させると、画面内のガンマカーブが揃わない場合に淡色表示時に色ムラが発生したり、表示品質規格(医用DICOM)を満たせなくなる場合もある。
図2のように、画面の位置によって色ムラが生じる理由は、G(緑)及びB(青)輝度に対するR(赤)輝度比が画面位置ごとに変化するためである。これを抑えるために、本実施形態では、全ての階調を同一のムラ特性に調整するように制御する。本実施形態では、0階調におけるムラ特性と、255階調におけるムラ特性を合わせているため、後述するように補完により生成されるその間の階調も、ムラ特性が同一になる。
映像表示部6のxy平面において、白レベルを表示させたとき、図3に示すような輝度のばらつき(輝度ムラ)がある。このため、出荷時にこの特性を付図示の撮像素子によって測定し、図3に示した輝度ムラを補正するムラ補正データがムラ補正データ記憶部202に記憶される。輝度ムラ特性算出部203によって、算出される255階調における輝度ムラ特性は、無補正時のものであるため、図3に示したような特性になる。
同様に、映像表示部6のxy平面において、黒レベルを表示させたとき、図4に示すような輝度ムラがある。従って、輝度ムラ特性算出部203によって、算出される0階調における輝度ムラ特性は、図4に示したような特性になる。
第1目標ムラ特性算出部205は、黒ムラ補正量算出部204から入力される目標黒ムラ補正量103と、輝度ムラ特性算出部203から入力される0階調パネル輝度ムラ特性102とに基づいて、0階調における目標ムラ特性(以下、0階調目標ムラ特性という)105を算出する。例えば、第1目標ムラ特性算出部205は、0階調パネル輝度ムラ特性102のうち、目標黒ムラ補正量103より低い輝度値を目標黒ムラ補正量103に置き換えることで、0階調目標ムラ特性105を算出する。第1目標ムラ特性算出部205は、算出した0階調目標ムラ特性105を補正データ生成部207及び判断部208に出力する。
第2目標ムラ特性算出部206は、バックライト制御部201から入力されたバックライト駆動値101と、輝度ムラ特性算出部203から入力される255階調パネル輝度ムラ特性102とに基づいて、255階調における目標ムラ特性(以下、255階調目標ムラ特性という)106を算出する。例えば、第2目標ムラ特性算出部206は、入力されたバックライト駆動値101と反比例する特性になるように255階調目標ムラ補正量を算出する。第2目標ムラ特性算出部206は、バックライト駆動値が低いときムラ補正量を100%とし、バックライト駆動値が最大のときムラ補正量を0%(ムラ補正がオフ状態)となるように減らしていくような特性の255階調目標ムラ補正量を算出する。なお、本実施形態では、ムラ特性が図7と同様であるとする。第2目標ムラ特性算出部206は、算出した255階調目標ムラ特性106を補正データ生成部207及び判断部208に出力する。
目標ムラ特性生成部2071は、第1目標ムラ特性算出部205から入力された0階調目標ムラ特性105と、第2目標ムラ特性算出部206から入力された255階調目標ムラ特性106とを用いて、0~255階調間の目標ムラ特性を生成する。目標ムラ特性生成部2071は、例えば、0階調目標ムラ特性105と255階調目標ムラ特性106とを補完して、0~255階調間の目標ムラ特性を生成する。補完には、例えば、BiCubic、スプラインなどの手法を用いる。目標ムラ特性生成部2071は、生成した0~255階調間の目標ムラ特性をムラ補正データ出力部2072に出力する。
このように警告を表示する理由は、前階調のムラ特性が同一でない場合、図2で説明したように色ムラが発生したり、例えば医療用DICOMなどの表示品質規格を満たせなくなるなど、画質不良が発生する場合があるためである。
なお、以下の処理では、予めムラ補正データ記憶部202、ムラ補正3DLUT5にムラ補正データが設定され、利用者によって白レベル及び黒レベルが設定されている。
図10は、本実施形態に係る判断部208が行う処理手順のフローチャートである。
(ステップS101)判断部208は、0階調目標ムラ特性105と255階調目標ムラ特性106について、それぞれ画面中央の値(輝度もしくは階調値)を基準(100%)として画面内の各点値を正規化する。
(ステップS102)判断部208は、画面位置毎に、正規化された0階調目標ムラ特性105と255階調目標ムラ特性106とを比較する。不一致の点を発見した時点で不一致を示す情報を重畳部209に出力する。
さらに、本実施形態では、グラフィックまたは医用利用者の「色再現の正確さ」ニーズにもとづき、設定された白/黒レベルを満たしつつ画面ムラが最小となるよう前記ムラ補正値は自動的に設定される。なお、「色再現の正確さ」ニーズにおける優先度は、白レベルが最も高く、次に黒レベル、次に白ムラ特性、次に黒ムラ特性の順である。すなわち、本実施形態では、グラフィックまたは医用利用者の「色再現の正確さ」ニーズの順に調整している。
また、本実施形態では、目標の表示特性にならない画面部位が存在する、もしくは色ムラのおそれがある場合は利用者に警告を通知することができる。
以上のように、本実施形態によれば、利用者の広範な目標白黒レベル設定に対する「色再現の正確さ」を改善し,また白ムラ設定及び黒ムラ設定など調節項目を削減することができるので「簡便な使い勝手」を提供する効果が得られる。
図11は、本実施形態に係る本実施形態に係る表示システム1Aの概略構成図である。第1実施形態で説明した表示システム1と同様の機能を有する機能部については同じ符号を用いて、説明を省略する。
図11に示すように、表示システム1Aは、映像補正装置2A、バックライト3、映像入力部4、ムラ補正3DLUT5、及び映像表示部6を含んで構成される。
図12は、本実施形態に係る本実施形態に係る表示システム1Bの概略構成図である。第1実施形態で説明した表示システム1と同様の機能を有する機能部については同じ符号を用いて、説明を省略する。
図12に示すように、表示システム1Bは、映像補正装置2B、バックライト3、映像入力部4、ムラ補正3DLUT5、及び映像表示部6を含んで構成される。
また、「コンピュータシステム」は、WWWシステムを利用している場合であれば、ホームページ提供環境(あるいは表示環境)も含むものとする。
また、「コンピュータ読み取り可能な記録媒体」とは、フレキシブルディスク、光磁気ディスク、ROM(Read Only Memory)、CD-ROM等の可搬媒体、USB(Universal Serial Bus) I/F(インタフェース)を介して接続されるUSBメモリ、コンピュータシステムに内蔵されるハードディスク等の記憶装置のことをいう。さらに「コンピュータ読み取り可能な記録媒体」とは、サーバやクライアントとなるコンピュータシステム内部の揮発性メモリのように、一定時間プログラムを保持しているものも含むものとする。また上記プログラムは、前述した機能の一部を実現するためのものであっても良く、さらに前述した機能をコンピュータシステムにすでに記録されているプログラムとの組み合わせで実現できるものであってもよい。
〔付記1〕
無補正時の表示パネルの輝度ムラの特性である無補正時ムラ特性であって、第1階調における前記無補正時ムラ特性である第1無補正時ムラ特性と、バックライト駆動値と黒レベルとに基づいて算出された補正量と、に基づいて、第1目標ムラ特性を算出する第1目標ムラ特性算出部と、
前記第1階調とは異なる第2階調における前記無補正時ムラ特性である第2無補正時ムラ特性と、前記バックライト駆動値と、に基づいて、第2目標ムラ特性を算出する第2目標ムラ特性算出部と、
前記第1無補正時ムラ特性と、前記第2無補正時ムラ特性と、前記第1目標ムラ特性と、前記第2目標ムラ特性と、に基づいて、映像信号を補正する階調毎の補正データを生成する補正データ生成部と、
を備える映像補正装置。
〔付記2〕
表示ムラを補正する予め設定された複数の階調それぞれに対するムラ特性に基づいて、前記第1階調と前記第2階調とを含む複数の階調それぞれの前記無補正時ムラ特性を算出する輝度ムラ算出部、を備える付記1に記載の映像補正装置。
〔付記3〕
前記黒レベルに比例し、前記バックライト駆動値に反比例する特性に基づいて前記補正量を算出する補正量算出部、を備える付記1または付記2に記載の映像補正装置。
〔付記4〕
前記補正データ生成部は、
前記第1目標ムラ特性と前記第2目標ムラ特性とを用いて、前記第1階調から前記第2階調間の目標ムラ特性を生成し、
各階調の前記無補正時ムラ特性と、生成された前記第1階調から前記第2階調間の目標ムラ特性とを階調毎に比較し、映像信号を補正する階調毎の補正データを生成する付記1から付記3のいずれか1つに記載の映像補正装置。
〔付記5〕
前記補正データ生成部が生成する階調毎の補正データは、3DLUTのデータである付記1から付記4のいずれか1つに記載の映像補正装置。
〔付記6〕
前記バックライト駆動値は、白レベルに応じたバックライトの駆動値である付記1から付記5のいずれか1つに記載の映像補正装置。
〔付記7〕
前記第1目標ムラ特性と前記第2目標ムラ特性とを比較し、前記第1目標ムラ特性と前記第2目標ムラ特性とが所定の範囲内である場合に一致すると判断し、所定の範囲外である場合に不一致であると判断する判断部と、
前記判断部の判断結果が不一致の場合に警告情報を生成し、生成した前記警告情報を前記映像信号に重畳する重畳部、を備える付記1から付記6のいずれか1項に記載の映像補正装置。
〔付記8〕
前記判断部は、前記第1目標ムラ特性及び前記第2目標ムラ特性において、それぞれ映像が表示される表示部における所定の位置の値を基準として表示部内の各点の値を正規化し、表示部内の点毎に前記正規化された前記第1目標ムラ特性と前記第2目標ムラ特性とが、所定の範囲内である場合に一致すると判断し、所定の範囲外である場合に不一致であると判断する付記7に記載の映像補正装置。
〔付記9〕
前記第1目標ムラ特性に含まれる値と前記第2目標ムラ特性とに含まれる値とが、映像が表示される表示部の所定の位置において、所定の範囲内である場合に一致すると判断し、所定の範囲外である場合に不一致であると判断する判断部と、
前記判断部の判断結果が不一致の場合に警告情報を生成し、生成した前記警告情報を前記映像信号に重畳する重畳部、を備える付記1から付記6のいずれか1つに記載の映像補正装置。
〔付記10〕
表示ムラを補正する予め設定された複数の階調それぞれに対するムラ特性に含まれる値と、前記補正データ生成部によって生成された前記階調毎の補正データとに含まれる値とが、所定の範囲内である場合に一致すると判断し、所定の範囲外である場合に不一致であると判断する判断部と、
前記判断部の判断結果が不一致の場合に警告情報を生成し、生成した前記警告情報を前記映像信号に重畳する重畳部、を備える付記2から付記6のいずれか1つに記載の映像補正装置。
〔付記11〕
画像を表示する表示パネルと、
無補正時の表示パネルの輝度ムラの特性である無補正時ムラ特性であって、第1階調における前記無補正時ムラ特性である第1無補正時ムラ特性と、バックライト駆動値と黒レベルとに基づいて算出された補正量と、に基づいて、第1目標ムラ特性を算出する第1目標ムラ特性算出部と、
前記第1階調とは異なる第2階調における前記無補正時ムラ特性である第2無補正時ムラ特性と、前記バックライト駆動値と、に基づいて、第2目標ムラ特性を算出する第2目標ムラ特性算出部と、
前記第1無補正時ムラ特性と、前記第2無補正時ムラ特性と、前記第1目標ムラ特性と、前記第2目標ムラ特性と、に基づいて、映像信号を補正する階調毎の補正データを生成する補正データ生成部と、
を備える表示装置。
〔付記12〕
無補正時の表示パネルの輝度ムラの特性である無補正時ムラ特性であって、第1階調における前記無補正時ムラ特性である第1無補正時ムラ特性と、バックライト駆動値と黒レベルとに基づいて算出された補正量と、に基づいて、第1目標ムラ特性を算出する第1目標ムラ特性算出手順と、
前記第1階調とは異なる第2階調における前記無補正時ムラ特性である第2無補正時ムラ特性と、前記バックライト駆動値と、に基づいて、第2目標ムラ特性を算出する第2目標ムラ特性算出手順と、
前記第1無補正時ムラ特性と、前記第2無補正時ムラ特性と、前記第1目標ムラ特性と、前記第2目標ムラ特性と、に基づいて、映像信号を補正する階調毎の補正データを生成する補正データ生成手順と、
を含む映像補正方法。
Claims (12)
- 無補正時の表示パネルの輝度ムラの特性である無補正時ムラ特性であって、第1階調における前記無補正時ムラ特性である第1無補正時ムラ特性と、バックライト駆動値と黒レベルとに基づいて算出された補正量と、に基づいて、第1目標ムラ特性を算出する第1目標ムラ特性算出部と、
前記第1階調とは異なる第2階調における前記無補正時ムラ特性である第2無補正時ムラ特性と、前記バックライト駆動値と、に基づいて、第2目標ムラ特性を算出する第2目標ムラ特性算出部と、
前記第1無補正時ムラ特性と、前記第2無補正時ムラ特性と、前記第1目標ムラ特性と、前記第2目標ムラ特性と、に基づいて、映像信号を補正する階調毎の補正データを生成する補正データ生成部と、
を備える映像補正装置。 - 表示ムラを補正する予め設定された複数の階調それぞれに対するムラ特性に基づいて、前記第1階調と前記第2階調とを含む複数の階調それぞれの前記無補正時ムラ特性を算出する輝度ムラ算出部、を備える請求項1に記載の映像補正装置。
- 前記黒レベルに比例し、前記バックライト駆動値に反比例する特性に基づいて前記補正量を算出する補正量算出部、を備える請求項1または請求項2に記載の映像補正装置。
- 前記補正データ生成部は、
前記第1目標ムラ特性と前記第2目標ムラ特性とを用いて、前記第1階調から前記第2階調間の目標ムラ特性を生成し、
各階調の前記無補正時ムラ特性と、生成された前記第1階調から前記第2階調間の目標ムラ特性とを階調毎に比較し、映像信号を補正する階調毎の補正データを生成する請求項1から請求項3のいずれか1項に記載の映像補正装置。 - 前記補正データ生成部が生成する階調毎の補正データは、3DLUTのデータである請求項1から請求項4のいずれか1項に記載の映像補正装置。
- 前記バックライト駆動値は、白レベルに応じたバックライトの駆動値である請求項1から請求項5のいずれか1項に記載の映像補正装置。
- 前記第1目標ムラ特性と前記第2目標ムラ特性とを比較し、前記第1目標ムラ特性と前記第2目標ムラ特性とが所定の範囲内である場合に一致すると判断し、所定の範囲外である場合に不一致であると判断する判断部と、
前記判断部の判断結果が不一致の場合に警告情報を生成し、生成した前記警告情報を前記映像信号に重畳する重畳部、を備える請求項1から請求項6のいずれか1項に記載の映像補正装置。 - 前記判断部は、前記第1目標ムラ特性及び前記第2目標ムラ特性において、それぞれ映像が表示される表示部における所定の位置の値を基準として表示部内の各点の値を正規化し、表示部内の点毎に前記正規化された前記第1目標ムラ特性と前記第2目標ムラ特性とが、所定の範囲内である場合に一致すると判断し、所定の範囲外である場合に不一致であると判断する請求項7に記載の映像補正装置。
- 前記第1目標ムラ特性に含まれる値と前記第2目標ムラ特性とに含まれる値とが、映像が表示される表示部の所定の位置において、所定の範囲内である場合に一致すると判断し、所定の範囲外である場合に不一致であると判断する判断部と、
前記判断部の判断結果が不一致の場合に警告情報を生成し、生成した前記警告情報を前記映像信号に重畳する重畳部、を備える請求項1から請求項6のいずれか1項に記載の映像補正装置。 - 表示ムラを補正する予め設定された複数の階調それぞれに対するムラ特性に含まれる値と、前記補正データ生成部によって生成された前記階調毎の補正データとに含まれる値とが、所定の範囲内である場合に一致すると判断し、所定の範囲外である場合に不一致であると判断する判断部と、
前記判断部の判断結果が不一致の場合に警告情報を生成し、生成した前記警告情報を前記映像信号に重畳する重畳部、を備える請求項2から請求項6のいずれか1項に記載の映像補正装置。 - 画像を表示する表示パネルと、
無補正時の表示パネルの輝度ムラの特性である無補正時ムラ特性であって、第1階調における前記無補正時ムラ特性である第1無補正時ムラ特性と、バックライト駆動値と黒レベルとに基づいて算出された補正量と、に基づいて、第1目標ムラ特性を算出する第1目標ムラ特性算出部と、
前記第1階調とは異なる第2階調における前記無補正時ムラ特性である第2無補正時ムラ特性と、前記バックライト駆動値と、に基づいて、第2目標ムラ特性を算出する第2目標ムラ特性算出部と、
前記第1無補正時ムラ特性と、前記第2無補正時ムラ特性と、前記第1目標ムラ特性と、前記第2目標ムラ特性と、に基づいて、映像信号を補正する階調毎の補正データを生成する補正データ生成部と、
を備える表示装置。 - 無補正時の表示パネルの輝度ムラの特性である無補正時ムラ特性であって、第1階調における前記無補正時ムラ特性である第1無補正時ムラ特性と、バックライト駆動値と黒レベルとに基づいて算出された補正量と、に基づいて、第1目標ムラ特性を算出する第1目標ムラ特性算出手順と、
前記第1階調とは異なる第2階調における前記無補正時ムラ特性である第2無補正時ムラ特性と、前記バックライト駆動値と、に基づいて、第2目標ムラ特性を算出する第2目標ムラ特性算出手順と、
前記第1無補正時ムラ特性と、前記第2無補正時ムラ特性と、前記第1目標ムラ特性と、前記第2目標ムラ特性と、に基づいて、映像信号を補正する階調毎の補正データを生成する補正データ生成手順と、
を含む映像補正方法。
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