WO2005066926A1 - 画像表示方法および画像表示装置 - Google Patents
画像表示方法および画像表示装置 Download PDFInfo
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- WO2005066926A1 WO2005066926A1 PCT/JP2003/017018 JP0317018W WO2005066926A1 WO 2005066926 A1 WO2005066926 A1 WO 2005066926A1 JP 0317018 W JP0317018 W JP 0317018W WO 2005066926 A1 WO2005066926 A1 WO 2005066926A1
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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
- G09G3/2007—Display of intermediate tones
- G09G3/2059—Display of intermediate tones using error diffusion
- G09G3/2062—Display of intermediate tones using error diffusion using error diffusion in time
- G09G3/2066—Display of intermediate tones using error diffusion using error diffusion in time with error diffusion in both space and time
-
- 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
- G09G3/2007—Display of intermediate tones
- G09G3/2018—Display of intermediate tones by time modulation using two or more time intervals
- G09G3/2022—Display of intermediate tones by time modulation using two or more time intervals using sub-frames
- G09G3/2029—Display of intermediate tones by time modulation using two or more time intervals using sub-frames the sub-frames having non-binary weights
-
- G—PHYSICS
- 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
- G09G2320/0261—Improving the quality of display appearance in the context of movement of objects on the screen or movement of the observer relative to the screen
-
- G—PHYSICS
- 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
- G09G2320/0266—Reduction of sub-frame artefacts
-
- G—PHYSICS
- 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
- G09G2320/10—Special adaptations of display systems for operation with variable images
- G09G2320/103—Detection of image changes, e.g. determination of an index representative of the image change
-
- 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
- G09G3/2007—Display of intermediate tones
- G09G3/2044—Display of intermediate tones using dithering
- G09G3/2051—Display of intermediate tones using dithering with use of a spatial dither pattern
-
- 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
- G09G3/2007—Display of intermediate tones
- G09G3/2044—Display of intermediate tones using dithering
- G09G3/2051—Display of intermediate tones using dithering with use of a spatial dither pattern
- G09G3/2055—Display of intermediate tones using dithering with use of a spatial dither pattern the pattern being varied in time
-
- 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
- G09G3/2007—Display of intermediate tones
- G09G3/2059—Display of intermediate tones using error diffusion
-
- 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
- G09G3/2007—Display of intermediate tones
- G09G3/2077—Display of intermediate tones by a combination of two or more gradation control methods
Definitions
- the present invention relates to an image display method and an image display device such as a plasma display panel (hereinafter abbreviated as PDP), a digital mirror device, and the like, which perform multi-gradation display by dividing an image of one field into a plurality of subfield images.
- PDP plasma display panel
- D mirror device and the like, which perform multi-gradation display by dividing an image of one field into a plurality of subfield images.
- each subfield is weighted with luminance.
- the brightness weight of the subfield corresponds to the amount of light emitted when each subfield is turned on. That is, each subfield has a predetermined number of times of light emission as a luminance weight, and the sum of the luminance weights of the subfields that emit light corresponds to the gradation of luminance to be displayed.
- Figure 10 shows one field divided into eight subfields (SF1, SF2,
- each subfield has a luminance weight of 1, 2, 4, 8, 16, 32, '64, 128.
- Each subfield has a setup period T1 for performing a preliminary discharge, a write period T2 for performing a write discharge for setting whether to light or not for each pixel, and a pixel in which the lighting data is written by the write discharge.
- a sustain period T3 for generating a sustain discharge to emit light. Light emission in the subfield occurs in j jets of SF1 to SF8.
- gradation level 21 can be expressed by 16-21.
- one field is divided into a plurality of subfields, and a subfield for obtaining a desired gradation is selected from the plurality of subfields to emit light. Expressing the key.
- a false contour line (hereinafter, abbreviated as a moving image pseudo contour) appears during a moving image display in a display device that performs multi-tone display using such a subfield method.
- a moving image pseudo contour will be described.
- FIG. 11 is a diagram showing a state in which the image pattern X moves on the screen of the PDP 33 in the horizontal direction. For example, one field is divided into 1, 2, 4, 8, 16, 32, 64, and 128 weighted subfields. Then, as shown in FIG. 11, a case is considered where the image pattern X moves horizontally on the screen of the PDP 33, corresponding to two pixels in one field.
- the image pattern X is composed of pixels P 1 and P 2 having a tone level of 127 and pixels P 3 and P 4 having a tone level of 128 adjacent thereto.
- FIG. 12 is a diagram in which the image pattern X is developed into subfields.
- the horizontal direction represents the horizontal direction on the screen of the PDP 33
- the vertical direction represents the time direction.
- the hatched subfields are light emitting subfields
- the hatched subfields are light emitting subfields.
- these subfields are all subfields that emit light. Key level 2 5 5 is visible.
- the grayscale levels are significantly different from the original grayscale levels (127 or 128), and these appear to the human eye as false contours, degrading image quality. Will be recognized as This is a false contour of a moving image, and the change in gradation is slight, but it occurs when pixels having gradations with a large change in the pattern of the emitting subfield are adjacent to each other. In the example of the weighted subfield described above, even when the luminance gradation of adjacent pixels is 63 and 64, 191 and 192, etc., this moving image pseudo contour is remarkably observed.
- the gradation of the input image is converted to a gradation at which a pseudo contour of a moving image is unlikely to occur, that is, a “predetermined gradation” in which a change in the pattern of the subfield that emits light is small.
- a “predetermined gradation” in which a change in the pattern of the subfield that emits light is small.
- the difference between the converted gray scale and the gray scale before conversion is diffused to the peripheral pixels. By doing so, the difference in gradation caused by the conversion is interpolated. If there is a large difference between the gradation of the input image and the "predetermined gradation", it is converted to "intermediate gradation" between the gradation of the input image and the "predetermined gradation”. .
- the gradation difference between the “middle gradation” and the “predetermined gradation” is added to or subtracted from the “middle gradation”.
- the addition and subtraction are alternated dot by dot, line by line, and field by field to represent the "intermediate gradation” on average.
- the “middle gradation” is used to suppress the moving image pseudo contour while suppressing a decrease in the number of gradations.
- the present invention provides an image display method and an image display apparatus capable of reducing a moving image pseudo-contour while maintaining gradation, even in a place where a large moving image pseudo-contour occurs. It is intended to manifest.
- the present invention relates to an image display method in which gradation is displayed by the subfield method, wherein a gradation in which not more than two non-lighting subfields having a small luminance weight are displayed in a lighting subfield having a maximum luminance weight is displayed.
- the gradation to be displayed is converted to the display gradation, and the image is displayed.
- the gray level to be displayed is the average of n (n is an integer of 2 or more) display gray levels selected from display gray levels.
- the present invention provides an image display device that performs gradation display by the subfield method, in a floor where two or more non-lighting subfields having a smaller luminance weight than the lighting subfield having the maximum luminance weight are not continuous.
- the gradation to be displayed is converted to a display gradation, and there is movement and gradation value.
- the first gradation which is the average of n (n is an integer of 2 or more) display gradations selected from the display gradations for the gradation to be displayed.
- Gray scale converting means for converting the first gray scale outputted from the gray scale converting means into n gray scales for display and / or temporally using the n gray scales for display.
- FIG. 1 is a block diagram showing a schematic configuration of an image display device according to an embodiment of the present invention.
- FIGS. 2A and 2B are diagrams showing combinations of display gradation and light emission for each subfield when performing 255 gradation display in 10 subfields according to an embodiment of the present invention.
- FIG. 3 is a diagram showing gradations 31 to 56 extracted from FIG. 2A.
- FIG. 4 is a diagram showing a state in which the inclined moving image area moves horizontally on the screen of the PDP according to the embodiment of the present invention.
- FIG. 5 is a diagram showing a first LUT included in the gradation conversion means according to one embodiment of the present invention.
- FIG. 6 is a diagram illustrating a second LUT included in the gradation conversion unit according to one embodiment of the present invention.
- FIG. 7A is a block diagram showing a configuration of the gradation conversion means in one embodiment of the present invention.
- FIGS. 7B and 7C are diagrams for explaining the operation of the gradation conversion means in one embodiment of the present invention.
- FIG. 8 is a block diagram showing a schematic configuration of an image display device in a case where the gradation conversion means according to one embodiment of the present invention includes a second diffusion means and an adder 51.
- FIGS. 9A and 9B are diagrams showing matrices when the first spreading means performs the first spreading process in one embodiment of the present invention.
- FIG. 10 is a diagram in which one field is divided into eight subfields.
- FIG. 11 is a diagram showing how the image pattern X moves horizontally on the PDP screen.
- FIG. 12 is a diagram showing the movement of the image pattern X and the movement of the line of sight.
- FIG. 13 is a diagram showing a case in which 22 to 39 tones are displayed with eight subfields according to the embodiment of the present invention.
- FIG. 1 is a block diagram showing a schematic configuration of an image display device (hereinafter abbreviated as a display device) according to an embodiment of the present invention.
- the display device includes an AZD converter 11, an inverse gamma corrector 13, a motion detector 15, an inclination detector 37, a gradation converter 17, a first diffusion unit 19, Video signal-to-subfield mapper 25, subfield processor 27, scan / maintain / erase drive circuit 29, and data drive circuit 3 1; a PDP 33; and a timing pulse generator 35.
- the PDP 33 is a display device that performs gradation display using the subfield method.
- the gradation to be displayed is limited due to the problem of the stability of the discharge.
- the discharge of PDP33 is not independent for each subfield, but is affected by the previous subfield.
- the ease with which a write discharge occurs in a certain subfield depends on whether a sustain discharge was performed in the previous subfield. That is, the write discharge is generated more easily when the sustain discharge is performed in the previous subfield, and the write discharge is less likely to occur unless the sustain discharge is performed.
- Figure 13 shows that one field consists of eight subfields (SF1, SF2, '
- the subfield indicated by “explosion” is a subfield in which light emission is performed.
- FIG. 13 at the gradation of 32, there is no sustain discharge from SF 1 to SF 5, and writing and sustain discharge are performed for the first time at SF 6. In such a case, write discharge is less likely to occur in SF 6 for the reasons described above. This phenomenon is particularly remarkable when the drive is performed with a shortened or omitted pre-discharge period in order to reduce the luminance during black display in order to improve the contrast. This is because the independence of each subfield is further weakened.
- 2A and 2B are diagrams showing combinations of display gradation and light emission for each subfield when 255 gradation display is performed in 10 subfields.
- one field period is divided into 10 sub-fields (SF1, SF2, and SF2) having luminance weights of 1, 2, 4, 8, 16, 25, 34, 44, 55, and 66, respectively.
- SF1, SF2, and SF2 10 sub-fields
- SF1 SF2, and SF2 sub-fields
- the subfield indicated by “Hata” is a subfield where light is emitted.
- sustain discharge is always performed in the subfield immediately before the subfield in which no sustain discharge is performed, and two or more unlit subfields are continuous. There is no. Therefore, the probability of failure in the write discharge can be reduced.
- the non-lighting sub-fields are used at gradations at which discharge occurs stably, that is, at a luminance weight smaller than the lighting sub-field having the maximum luminance weight as shown in FIGS. 2A and 2B.
- the grayscale where two or more are not continuous is adopted as “display grayscale”.
- a PDP 33 is a display device in which electrodes are arranged in a matrix and emits light in an ON or OFF binary manner.
- multi-gradation display is performed using a plurality of subfields each weighted in PDP 33.
- the timing pulse generator 35 generates a timing signal (operating clock) based on the horizontal synchronizing signal (HD) and the vertical synchronizing signal (VD), and supplies it to each unit in the display device.
- the AZD converter 11 1 performs analog-to-digital conversion (hereinafter abbreviated as AZD conversion) of the input RGB signal.
- the AZD-converted RGB signal is subjected to inverse gamma correction by the inverse gamma corrector 13. That is, since the RGB signal is sent with a gamma characteristic that is assumed to be displayed on a CRT display device, the characteristic is restored by performing inverse gamma correction.
- the motion detector 15 detects a moving image portion of the A / D converted R GB signal. If a video part is detected, “1” is output as the output, otherwise “0” is output.
- the difference between the gradation values of the pixels between two consecutive fields is determined, and when the absolute value of the difference value is equal to or greater than a predetermined value, the pixel is regarded as a moving image portion.
- the tilt detector 37 detects a tilt portion of the AZD-converted RGB signal. If a sloping part is detected, “1” is output as the output. Otherwise, “0” is output.
- m is an integer of 2 or more
- the gradation value monotonously changes in a portion where the gradation value is monotonically increasing or decreasing. Display area, that is, an inclined portion.
- the value of m is set to the number of pixels that is 3 mm or more and 15 mm or less on the display screen. This is equivalent to 0.3% to 1.5% of the width of the display screen in a 42-inch PDP. If the value of m is set smaller than the above value, even a minute area where the video contour is not observed will be detected. Area is no longer detected.
- the outputs from the motion detector 15 and the tilt detector 37 and the RGB signal after the inverse gamma correction are input to the gradation converter 17, and the gradation converter 17 and the first diffusion unit According to 19, a process for suppressing the generation of the false contour of the moving image and a process for complementing the discontinuity between gradations for the stability of discharge are performed.
- the gradation conversion means 17 sets, as a target pixel, a pixel detected as being larger than a predetermined value, an inclined portion, and a moving image portion with respect to the input video signal.
- Non-target pixels are set as non-target pixels.
- the gradation of the target pixel is converted into a first gradation which is an average of four gradations selected from among the display gradations.
- the gradation of the non-target pixels is converted to display gradation. Details of the above will be described later.
- the first diffusion means 19 averages the first gradation output from the gradation conversion means 17 spatially and Z or temporally using the four gradations described above. Perform the diffusion process of 1. This will be described later in detail.
- the video signal output from the first spreading means 19 is input to the B image signal / subfield correlator 25.
- the video signal-to-subfield mapping unit 25 converts the video signal into field information.
- the field information is composed of a plurality of bits indicating whether each subfield is to be emitted (lit).
- the subfield processor 27 receives the video signal—subfield The number of sustain pulses is determined based on the field information.
- the scan / sustain / erase drive circuit 29 and the data drive circuit 31 control the electrodes of the PDP 33 based on the output from the sub-field processor 27, and control the light emission amount of each pixel. An image having a desired gradation is displayed thereon.
- FIG. 3 is a diagram showing gradations 31 to 56 extracted from FIG. 2A.
- FIG. 4 is a diagram showing a state in which the tilt moving image area moves in the horizontal direction on the PDP 33 screen.
- the dotted arrow shown in FIG. 3 indicates the movement of the line of sight when the inclined moving image area shown in FIG. 4 moves in the direction shown by the arrow in FIG.
- the location and degree of occurrence vary according to the movement of the image. Animation false contours are observed.
- an area where light emission cannot be observed occurs as shown by a dotted arrow in FIG. 3 during one field. As a result, this region is observed as a moving image pseudo contour that is very dark compared to the original luminance values of “31” to “55”.
- the non-lighting subfield having the maximum luminance weight among the non-lighting subfields having a luminance weight smaller than the maximum luminance weight in the lit subfields in one field period overlaps on the retina, and an extremely dark part compared to the surrounding area is observed as a moving image pseudo contour.
- the moving image pseudo-contour is a specific area determined by the gradient of the image gradation and the movement of the image, where the gradations that have adjacent subfields as “intermediate non-lighted subfields” are concentrated. Occurs when present.
- the gradation “4 0” has SF 5 as an intermediate non-lighting subfield.
- the gradation “4 8” has SF 4 as an intermediate non-lighting subfield.
- “40” and “48j” are gradations that have intermediate non-lighting subfields adjacent to them.
- “40” “48” “52” “54” “55” “” Is a gray scale with an intermediate non-lighting subfield adjacent to it.
- n (n is an integer of 2 or more) display gradations are selected from the display gradations, and at least one of the n display gradations is turned on.
- the non-lighting subfield having the maximum luminance weight among the non-lighting subfields having a luminance weight smaller than the maximum luminance weight in the subfield so that the ⁇ intermediate non-lighting subfields '' include different ones. select. That is, the gray level of the target pixel is selected from the display gray levels and n gray levels to which the “intermediate non-lighting subfield” is not adjacent are selected, and converted to a first gray level that is averaged.
- the first grayscale is pseudo-expressed by a first diffusion process of averaging temporally and spatially the first grayscale using n display grayscales.
- the gradation is displayed without performing the process of diffusing the intermediate non-lighting subfield described above.
- the gradation conversion means 17 has a look-up table (hereinafter abbreviated as LUT), and converts the gradation of the pixel using this LUT.
- LUT look-up table
- FIG. 5 is a diagram illustrating a first LUT included in the gradation conversion unit 17
- FIG. 6 is a diagram illustrating a second LUT included in the gradation conversion unit 17.
- the gradation conversion means 17 switches the LUT to be used according to the output from the motion detector 15 and the inclination detector 37 and the gradation value of the input signal.
- the first LUT shown in FIG. 5 selects one of the display gradations.
- the four gradations are converted to the first gradation, which is the gradation obtained by averaging.
- the other non-target pixels are converted into display gradations by the second LUT shown in FIG.
- the gradation value is desirably 50 or less.
- the size of the pseudo contour of the moving image varies depending on the number of subfields and weighting, so the optimal value differs for each model.
- the first spreading means 19 is, for example, a matrix addition circuit, and performs a predetermined spreading process on the gradation output from the gradation conversion means 17 based on the amount of addition shown in FIGS. A certain first diffusion process is performed. Details of this will be described later.
- the first gradation shown as the first LUT in FIG. 5 averages four gradations selected every other from the display gradations shown as the second LUT in FIG. It was created by this.
- the gray scale “10” is the display gray scale (second LUT) “5”, Average of "7", "1 3" and "1 5".
- the reason for selecting every other display grayscale is to use grayscales in which the intermediate non-lighting subfields are not adjacent as much as possible. By selecting in this way, in the first diffusion processing described later, the gradations having adjacent intermediate non-lighting subfields are not aligned, so that it is possible to suppress the moving image false contour.
- FIG. 7A is a block diagram showing a schematic configuration of the gradation conversion means 17 in the present embodiment
- FIGS. 7B and 7C are diagrams for explaining the operation of the gradation conversion means 17 in the present embodiment.
- the gradation conversion means 17 includes a logical product gate 50 for performing a logical product of an output from the motion detector 15 and an output from the tilt detector 37, a first LUT and a second LUT. And a LUT 53 having and.
- a configuration may be provided that includes second diffusion means 60 as an error diffusion processing circuit for performing error diffusion processing, and an adder 51.
- FIG. 8 is a block diagram showing a schematic configuration of an image display device in the case where the gradation conversion means 17 includes the second diffusion means 60 and the adder 51.
- the output of AND gate 50 is 1, that is, the output of motion detector 15 If the target pixel is 1 and the output of the tilt detector 37 is 1, select the first LUT. If the logical product is 0, that is, the non-target pixel, select the second LUT. . Then, based on the pixel gradation input from the inverse gamma corrector 13, the LUT 53 selects the one closest to the pixel gradation from the first LUT or the second LUT. Select and output. That is, the gradation value of the pixel is converted into a display gradation in the case of a non-target pixel, and is converted into the first gradation in the case of a target pixel.
- the video signal including the gradation information of the pixel is input from the inverse gamma corrector 13 to the adder 51, the original gradation of the pixel based on the video signal and the pixel processed before the pixel are calculated.
- the diffused error e is added and output to the LUT 53 and the second diffusion means 60.
- the second diffusion means 60 which is an error diffusion processing circuit, obtains an error e ′ which is a difference between the gradation after conversion by the LUT 53 and the gradation before conversion, and processes the error e ′.
- a second error diffusion process for diffusing pixels around the middle pixel is performed.
- the gradation to be displayed over the entire screen is preserved, and when the entire screen is viewed, the brightness of the original pixel appears to the human eye. Appears to be displayed. As a result, high-quality images without image roughness can be expressed.
- the second diffusion means 60 the gradation value output from the LUT 53 is output to the second diffusion means 60 before being input to the first diffusion means 19.
- the adder 51 adds the original gradation of the pixel of the input video signal and the diffusion error e calculated based on the gradation of the pixel preceding the pixel by the second diffusion means 60. , LUT 53 and the second diffusion means 60.
- the operation of the second diffusion means 60 is as follows.
- the second spreading means 60 includes a subtracter 61, delayers 63, 65, 67, 69, and multipliers 71, 73, 75, 7 7 and an adder 7 9.
- the subtractor 61 subtracts the gradation output from the LUT 53 from the gradation obtained by adding the diffusion error e to the original gradation of the pixel, and obtains the difference e ′ as the difference therebetween.
- the error e ' is input to the delay units 63 and 69.
- the delay unit 63 delays the input signal by “one horizontal period—one pixel” and outputs it. If 1 If the horizontal period (hereinafter abbreviated as one line) is 910 pixels, the delay 63 delays by 909 pixels.
- Each of the delay units 65, 67, and 69 delays the input signal by one pixel and outputs it. Therefore, the delay unit 63 outputs the error ei ′ obtained for the pixel “one pixel per line” before the pixel currently being processed.
- the delay unit 65 outputs the error e 2 ′ obtained for the pixel “one line” before the pixel currently being processed.
- the delay unit 67 outputs the error e 3 ′ obtained for the pixel “one line + 1 pixel” before the pixel currently being processed.
- the delay unit 69 outputs the error e 4 ′ obtained for the pixel “one pixel” before the pixel currently being processed.
- the error e is multiplied by a predetermined coefficient k 1 in a multiplier 73.
- a predetermined coefficient k 2 in multiplier 75 the error e 2, 'the predetermined coefficient k 3 at multiplier 77, the error e 4' error e 3 given by the multiplier 71 to Multiply the coefficient k 0.
- the outputs from the multipliers 71, 73, 75, and 77 are summed by an adder 79, and the result is output as a diffusion error e for the pixel.
- the second diffusion means 60 calculates an error e ′ which is a difference between the gradation obtained by adding the diffusion error e to the original gradation of the pixel and the gradation converted by the LUT 53 as shown in FIG. 7C. Then, it is diffused to pixels around the pixel at a predetermined ratio k0 to k3. Further, as shown in FIG. 7B, the diffusion error e for a certain pixel is obtained by summing the errors diffused from the pixels around the pixel.
- the LUT 53 outputs four addition amounts corresponding to the respective gradation values shown in the first LUT of FIG. 5 or the second LUT of FIG. Note that the addition amount for the gradation output from the second LUT is all zero.
- the gradation conversion means 17 adds the diffusion error e to the gradation of the pixel of the input video signal, and selects and outputs a gradation suitable for expressing the gradation after the addition. In addition, it outputs the four addition amounts for that gradation.
- the video signal and the amount of addition from the gradation conversion means 17 are input to the first diffusion means 19.
- the first spreading means 19 performs a first spreading process.
- the first gradation is expressed as follows.
- FIG. 9A and 9B are diagrams showing matrices when the first spreading means 19 performs the first spreading process.
- a matrix of 2 pixels ⁇ 2 lines is spread as shown in FIG. 9B.
- the addition amount at the corresponding position is added to the gradation of each pixel after the second diffusion processing.
- d1 to d4 are differences between the first gradation and the display gradation used to create the first gradation. Therefore, since the result of adding d1 to d4 to the first gradation is a display gradation, the first gradation is preserved when spatially averaged. In addition, by changing the positions of d1 to d4 for each field, they are averaged over time, and the first gradation is preserved.
- the intermediate non-lighting subfields do not have adjacent gradations. Therefore, even if the line of sight follows the moving image portion, the intermediate unlit subfields do not overlap on the retina, and a large moving image pseudo contour is not observed.
- the gradation “8 1” is the four gradations “65”, “82”, “88”, and “90” that are the display gradations. It is expressed by averaging.
- the intermediate non-lighting subfield of “65” is SF6.
- the intermediate non-lighting subfield of “82” is SF4.
- the middle non-lighting subfield of “8 8” is SF2.
- the addition amounts are all set to 0.
- the number of subfields is set to 10.
- a display device having an arbitrary number of subfields can exhibit a moving image false contour suppression effect as in the present invention.
- gradations are selected and used from the display gradations in order to create the first gradation.
- the number of gradations is not limited to “four” and may be any number. Keys can be used.
- the gray scales shown in FIGS. 2A and 2B are used as “display gray scales”.
- the present invention is not limited to this.
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- Computer Hardware Design (AREA)
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- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Control Of Gas Discharge Display Tubes (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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US10/515,526 US7499062B2 (en) | 2002-10-11 | 2003-12-26 | Image display method and image display apparatus for displaying a gradation by a subfield method |
EP03782952A EP1696407A4 (en) | 2003-12-26 | 2003-12-26 | IMAGE DISPLAY METHOD AND IMAGE DISPLAY |
PCT/JP2003/017018 WO2005066926A1 (ja) | 2003-12-26 | 2003-12-26 | 画像表示方法および画像表示装置 |
CN2003801030131A CN1711574B (zh) | 2003-12-26 | 2003-12-26 | 图象显示方法及图象显示装置 |
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PCT/JP2003/017018 WO2005066926A1 (ja) | 2003-12-26 | 2003-12-26 | 画像表示方法および画像表示装置 |
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EP (1) | EP1696407A4 (ja) |
CN (1) | CN1711574B (ja) |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN100419831C (zh) * | 2006-01-18 | 2008-09-17 | 四川世纪双虹显示器件有限公司 | 一种改善等离子图像伪轮廓的方法 |
Families Citing this family (2)
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US7710358B2 (en) | 2003-12-26 | 2010-05-04 | Panasonic Corporation | Image display apparatus for correcting dynamic false contours |
JP5456372B2 (ja) * | 2009-05-29 | 2014-03-26 | グローバル・オーエルイーディー・テクノロジー・リミテッド・ライアビリティ・カンパニー | 表示装置 |
Citations (4)
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JPH11212517A (ja) * | 1997-11-18 | 1999-08-06 | Matsushita Electric Ind Co Ltd | 多階調画像表示装置 |
JPH11231827A (ja) * | 1997-07-24 | 1999-08-27 | Matsushita Electric Ind Co Ltd | 画像表示装置及び画像評価装置 |
JP2002023692A (ja) * | 2000-07-04 | 2002-01-23 | Matsushita Electric Ind Co Ltd | 表示装置および表示方法 |
JP2003228319A (ja) * | 2002-02-01 | 2003-08-15 | Pioneer Electronic Corp | ディスプレイパネルの駆動方法 |
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EP0893916B1 (en) * | 1997-07-24 | 2004-04-07 | Matsushita Electric Industrial Co., Ltd. | Image display apparatus and image evaluation apparatus |
US6965358B1 (en) * | 1999-01-22 | 2005-11-15 | Matsushita Electric Industrial Co., Ltd. | Apparatus and method for making a gray scale display with subframes |
CN100345172C (zh) * | 2002-04-24 | 2007-10-24 | 松下电器产业株式会社 | 图像显示装置 |
-
2003
- 2003-12-26 CN CN2003801030131A patent/CN1711574B/zh not_active Expired - Fee Related
- 2003-12-26 EP EP03782952A patent/EP1696407A4/en not_active Withdrawn
- 2003-12-26 WO PCT/JP2003/017018 patent/WO2005066926A1/ja active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH11231827A (ja) * | 1997-07-24 | 1999-08-27 | Matsushita Electric Ind Co Ltd | 画像表示装置及び画像評価装置 |
JPH11212517A (ja) * | 1997-11-18 | 1999-08-06 | Matsushita Electric Ind Co Ltd | 多階調画像表示装置 |
JP2002023692A (ja) * | 2000-07-04 | 2002-01-23 | Matsushita Electric Ind Co Ltd | 表示装置および表示方法 |
JP2003228319A (ja) * | 2002-02-01 | 2003-08-15 | Pioneer Electronic Corp | ディスプレイパネルの駆動方法 |
Non-Patent Citations (1)
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100419831C (zh) * | 2006-01-18 | 2008-09-17 | 四川世纪双虹显示器件有限公司 | 一种改善等离子图像伪轮廓的方法 |
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Publication number | Publication date |
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CN1711574A (zh) | 2005-12-21 |
CN1711574B (zh) | 2011-12-07 |
EP1696407A4 (en) | 2008-06-04 |
EP1696407A1 (en) | 2006-08-30 |
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