CN1711574B - Image displaying method and apparatus - Google Patents
Image displaying method and apparatus Download PDFInfo
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- CN1711574B CN1711574B CN2003801030131A CN200380103013A CN1711574B CN 1711574 B CN1711574 B CN 1711574B CN 2003801030131 A CN2003801030131 A CN 2003801030131A CN 200380103013 A CN200380103013 A CN 200380103013A CN 1711574 B CN1711574 B CN 1711574B
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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
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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
- G09G3/2018—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
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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
- 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
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0266—Reduction of sub-frame artefacts
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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
- 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
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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
- G09G3/2044—Display of intermediate tones using dithering
- G09G3/2051—Display of intermediate tones using dithering with use of a spatial dither pattern
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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
- G09G3/2044—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
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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
-
- 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
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- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Control Of Gas Discharge Display Tubes (AREA)
Abstract
An image displaying method and an image display in which pseudo-profile of a moving image can be reduced while sustaining gradation even at a position where pseudo-profile of a moving image is significant. In the image displaying method and image display, gray level of a pixel is displayed while being converted into a display gray level in the case of a nonobjective pixel. In the case of an objective pixel, it is converted into a first gray level, i.e. an average value of n (an integer of 2 or above) gray levels selected from among the display gray levels. Pseudo-profile of a moving image is reduced while sustaining gradation by performing first diffusion process of averaging the first gray levels spatially and/or temporally using the n gray levels.
Description
Technical field
The present invention relates to a kind ofly become a plurality of sub-scanning field images to carry out the image display method and the image display apparatus of plasma display panel (PDP) (hereinafter to be referred as " PDP ") that many gray scales (gradient) show and digital mirror device etc. 1 scanning field image Segmentation.
Background technology
Carry out often adopting so-called " sub-scanning field method " in the image demonstration of luminous image display apparatus on ambiguities such as PDP ground, that is: by the overlapping a plurality of binary imagess of weighting respectively in timeliness ground, the animated image that demonstration has middle gray.
In sub-scanning field method, 1 scanning field is divided into a plurality of sub-scanning fields, carry out luminance weighted for each sub-scanning field respectively.Sub-scanning field luminance weighted, the luminous quantity when each sub-scanning field is lit a lamp is corresponding.In other words, each sub-scanning field with fixed number of light emission times, as luminance weighted, the luminance weighted total of luminous sub-scanning field, corresponding with the brightness that shows.
Figure 10 be with 1 scanning field be divided into 8 sub-scanning fields (SF1, SF2 ..., SF8) figure.At Figure 10, each sub-scanning field have 1,2,4,8,16,32,64,128 luminance weighted.Each sub-scanning field has: prepare T1 during the foundation of discharge; Be intended to set that each pixel is lit a lamp or lamplerssly write T2 during the writing of discharge; Writing in the pixel of the data of lighting a lamp by writing discharge, it is being produced simultaneously keep discharge and T3 during luminous the keeping.In addition, sub-scanning field luminous carried out according to the order from SF1 to SF8.
In the example of Figure 10, luminous by this a little scanning field being carried out various combinations back, thus show the grey level in 256 stages of 0～255.For example, luminous by making SF1, SF2, SF3, can use 1+2+4=7 representing gradation level 7; Can also be luminous by making SF1, SF3, SF5, can use 1+4+16=21 representing gradation level 21.
Like this, in sub-scanning field method, 1 scanning field is divided into a plurality of sub-scanning fields, from a plurality of sub-scanning fields, selects to be intended to obtain the sub-scanning field of required gray scale, and make it luminous, thereby show many gray scales.
As everyone knows: carry out when animation display, pseudo-contour noise (hereinafter to be referred as " the doubtful profile of animation ") can occurring in the display device of many gray scales demonstrations in this seed scanning field method of use.Below, tell about the doubtful profile of this animation.
Figure 11 is the figure of presentation image pattern X situation about moving to horizontal direction on the picture of PDP33.For example, 1 scanning field is divided into is weighted 1,2,4,8,16,32,64,128 sub-scanning field.Then, as shown in figure 11, consider that visual pattern X moves the situation that 1 scanning field is equivalent to 2 pixels to horizontal direction on the picture of PDP33.Image pattern X is made up of pixel P3, the P4 of pixel P1, the P2 of grey level 127 and adjacent with it grey level 128.Figure 12 is the figure that visual pattern X is launched into sub-scanning field.
In Figure 12, transverse direction is represented on the picture of PDP33 to horizontal direction, longitudinal direction express time direction.In addition, being stamped the sub-scanning field of profile line, is luminous sub-scanning field; Not stamped the sub-scanning field of profile line, is non-luminous sub-scanning field.
In Figure 12, when visual pattern X is static, because people's sight line does not move (A-A ' among the figure), so can see the gray scale that pixel is original., visual pattern X after horizontal direction moves, sees its people's sight line as shown in figure 11, just follows visual pattern X, moves to B-B ' or the C-C ' direction of Figure 12.When sight line moves to B-B ' direction, in people's the eyes, can see SF6, the SF7 of SF1～SF5, pixel P3 of pixel P4 and the SF8 of pixel P2.In Figure 12, this a little scanning field all is non-luminous sub-scanning field, so can see that in people's eyes they are by the grey level 0 of time integral.In addition, when sight line moves to C-C ' direction, in people's the eyes, can see SF6, the SF7 of SF1～SF5, pixel P2 of pixel P1 and the SF8 of pixel P3.In Figure 12, this a little scanning field all is luminous sub-scanning field, so can see that in people's eyes they are by the grey level 255 of time integral.No matter being the former or the latter, all is the gray scale that differs greatly with original grey level (127 or 128), and in people's eyes, they are in sight as pseudo-contour noise, are familiar with as the deterioration of image quality.Here it is the doubtful profile of animation takes place when the pixel of the gray scale that alters a great deal of the pattern of very little with the variation for gray scale, luminous sub-scanning field is adjacent.In the example of the sub-scanning field of above-mentioned weighting, when the brightness of neighboring pixels is 63 and 64,191 and 192 etc., also can observe the doubtful profile of this animation significantly.
In the prior art, the method that suppresses the doubtful profile of this animation is as follows: at first, the greyscale transformation of input imagery is become to be not easy to produce the gray scale of the doubtful profile of animation, promptly be transformed into the modal shift of luminous sub-scanning field less " fixed gray scale ".Then, with the difference of gray scale after this conversion and the gray scale before the conversion, to its peripheral pixel diffusion.The gray scale of interpolation conversion generation is poor in this way.When if the gray scale difference between the gray scale of input imagery and " fixed gray scale " is big, just be transformed into " gray scale of centre " between the gray scale that is in input imagery and " fixed gray scale ".Follow again, will " middle gray scale " with " fixed gray scale " between gray scale difference and " gray scale of centre " addition or subtract each other.After every point, every row, each scanning field hocket this addition and subtraction, thus evenness performance " middle gray scale ".Like this, on the basis of " fixed gray scale " of using that the doubtful profile of animation is difficult for producing, re-use " middle gray scale ", thereby one side suppresses the minimizing of grey, one side suppresses the doubtful profile of animation.
; in above-mentioned prior art; exist following problem: gray scale has inclination to a certain degree; and the continuous part that relates to of a plurality of pixels that can see fully aware ofly; the inaccurate part of focus etc. in the image for example; after moving with the speed that can catch up with eyes, can observe the doubtful profile of very large animation.In addition, also exist near the gray scale that produces the bigger doubtful profile of animation, in order to suppress the doubtful profile of this animation, and must reduce gray scale, so can not guarantee the problem of grey.
Summary of the invention
Purpose of the present invention just is to be provided at the position of the bigger doubtful profile of animation of generation, also can simultaneously keep gray scale, and one side is cut down the image display method and the image display apparatus of the doubtful profile of animation.
Image display method of the present invention adopts sub-scanning field method to carry out the gray scale demonstration, compare with the luminance weighted sub-scanning field of lighting a lamp with maximum, has the less luminance weighted non-sub-scanning field of lighting a lamp, to there be continuous gray scale more than 2 to use gray scale as showing, for the motionless or gray-scale value viewing area of monotone variation not, to need gray-scale displayed, and be transformed into demonstration and show with the laggard row image of gray scale; Viewing area for moving and gray-scale value monotone variation, to need gray-scale displayed, be transformed into according to making and show with in the gray scale, at least one is included in the non-sub-scanning field of lighting a lamp that has than having the high-high brightness weighting in the little luminance weighted non-sub-scanning field of lighting a lamp of the high-high brightness weighting in the sub-scanning field of lighting a lamp---the mode of the gray scale that " the middle non-sub-scanning field of lighting a lamp " is different, from showing with the mean value of the individual demonstration of the n that selects the gray scale (n is the integer more than 2) with gray scale---after the 1st gray scale, carry out displayed image after the 1st DIFFUSION TREATMENT, described the 1st DIFFUSION TREATMENT is carried out will use in order to generate described the 1st gray scale described n and is shown with the capable (k of the k pixel * j that difference value constituted between gray scale and described the 1st gray scale, j is the positive integer that makes k * j=n) matrix, handle with the addition of matrices that is transformed into the visual addition after described the 1st gray scale.
In addition, image display apparatus of the present invention adopts sub-scanning field method to carry out gray scale and shows, compares with the luminance weighted sub-scanning field of lighting a lamp with maximum, to have the less luminance weighted non-sub-scanning field of lighting a lamp and not have continuous gray scale more than 2 as the demonstration gray scale
Comprise: for the motionless or gray-scale value viewing area of monotone variation not, will need gray-scale displayed, and be transformed into described demonstration and show with the laggard row image of gray scale; Viewing area for moving and gray-scale value monotone variation, to need gray-scale displayed, be transformed into according to making and show with in the gray scale, at least one is included in the non-sub-scanning field of lighting a lamp that has than having the high-high brightness weighting in the little luminance weighted non-sub-scanning field of lighting a lamp of the high-high brightness weighting in the sub-scanning field of lighting a lamp---the mode of the gray scale that " the middle non-sub-scanning field of lighting a lamp " is different, show mean value---the greyscale transformation unit of the 1st gray scale of using gray scale from described demonstration with the n that selects the gray scale, wherein, n is the integer more than 2; With
For the 1st gray scale from the output of described greyscale transformation unit, described n the matrix that shows with the k pixel * j that difference value constituted capable (k, j are the positive integers that makes k * j=n) between gray scale and described the 1st gray scale that carries out using in order to generate described the 1st gray scale is with the 1st diffusion unit of the addition of matrices processing that is transformed into described the 1st image gray addition.
Description of drawings
Fig. 1 is the block scheme of the brief configuration of the image display apparatus in expression one embodiment of the present invention.
Fig. 2 A, B are the figures that carries out the luminous combination of the display gray scale in 255 gray scales when demonstration and each sub-scanning field in expression one embodiment of the present invention with 10 sub-scanning fields.
Fig. 3 is the figure of expression from the gray scale 31～56 of Fig. 2 A extraction.
Fig. 4 is the figure of the sample attitude that moves to horizontal direction on the picture of PDP of expression one embodiment of the present invention medium dip animation region.
Fig. 5 is the figure of the 1LUT that the greyscale transformation unit has in expression one embodiment of the present invention.
Fig. 6 is the figure of the 2LUT that the greyscale transformation unit has in expression one embodiment of the present invention.
Fig. 7 A is the block scheme of the structure of the greyscale transformation unit in expression one embodiment of the present invention.
Fig. 7 B, C are the figures of telling about the action of the greyscale transformation unit in one embodiment of the present invention.
Fig. 8 is the block scheme of the brief configuration of the image display apparatus of the greyscale transformation unit of expression in one embodiment of the present invention with the 1st diffusion unit and totalizer 51.
Fig. 9 A, B are the figures of the matrix when carrying out the 1st DIFFUSION TREATMENT in expression one embodiment of the present invention in the 1st diffusion unit.
Figure 10 is the figure that 1 scanning field is divided into 8 sub-scanning fields.
Figure 11 is the figure of presentation image pattern X situation about moving to horizontal direction on the picture of PDP.
Figure 12 is the figure that moves of moving of presentation image pattern X and sight line.
Figure 13 is the figures of 8 sub-scanning fields of the usefulness of expression in one embodiment of the present invention when showing 22～39 gray scale.
Embodiment
(embodiment)
Below, consult accompanying drawing, tell about one embodiment of the present invention.In addition, in the present embodiment,, only a kind of color is told about for making purposes of simplicity of explanation.But in R (red), G (green), B (indigo plant) are of all kinds, can both be suitable equally.
Fig. 1 is the block scheme of the brief configuration of the image display apparatus (hereinafter to be referred as " display device ") that adopts of expression one embodiment of the present invention.Display device is kept cancellation driving circuit 29, data drive circuit 31, PDP33 and sequence timer 35 and is constituted by A/D transducer 11, inverse gamma correction device 13, motion detector 15, inclination detector 37, greyscale transformation unit the 17, the 1st diffusion unit 19, picture intelligence-sub-scanning field corresponder 25, sub-scanning field processor 27, scanning.
Here, PDP33 is to use sub-scanning field method to carry out the display device that gray scale shows.At this moment, because the problem of the stability of discharge is often limited gray-scale displayed.Because the influence of sub-scanning field is before this accepted in the discharge of PDP33, is not that each sub-scanning field independently carries out.Be easy to generate the degree that writes discharge in certain sub-scanning field, it is in close relations whether individual sub-scanning field last with it carried out keeping discharge.In other words, last sub-scanning field carried out keeping discharge, was easy to generate and write discharge; Do not carry out keeping discharge, and be not easy to produce and write discharge.This is because if last sub-scanning field carried out keeping discharge, in discharge space, is just emitted a large amount of charged particles so, and they become the cause that next sub-scanning field writes " kind " of discharge.And, in certain sub-scanning field, being not easy generation and writing discharge, it is big that probability that in other words can not be luminous during keeping becomes, and takes place if this situation is frequent, and image quality is descended greatly.
Figure 13 be the expression with 1 scanning field be divided into 8 sub-scanning fields (SF1, SF2 ..., SF8), luminance weighted with separately, the situation when showing 22～39 gray scale as 1,2,4,8,16,32,64,128.In addition, with the sub-scanning field of " ● " expression, be to carry out luminous sub-scanning field.In Figure 13,32 these gray scales are not kept discharge at SF1～SF5, just write and keep discharge at SF6.At this moment, for the foregoing reasons, in SF6, also be difficult to generation and write discharge.And, for improve contrast, brightness when reducing black the demonstration, and when driving, shorten or when omitting the preparation interdischarge interval, this phenomenon is particularly remarkable.Because it further weakens the independence of each sub-scanning field.
In order to prevent the above-mentioned the sort of failure that writes, it is to limit the gray scale of using that kind of method is arranged.Fig. 2 A, the B figure that to be expression carry out the luminous combination of the display gray scale in 255 gray scales when demonstration and each sub-scanning field with 10 sub-scanning fields.In Fig. 2 A, B, express with 1 scanning field be divided into luminance weighted be respectively 10 sub-scanning fields such as 1,2,4,8,16,25,34,44,55,66 (SF1, SF2 ..., SF10), carry out 255 gray scales when showing display gray scale and the luminous combination of each sub-scanning field.Here, with the sub-scanning field of " ● " expression, be to carry out luminous sub-scanning field.In the example shown in Fig. 2 A, the B, all gray scales at last sub-scanning field of the sub-scanning field of not keeping discharge, are necessarily kept discharge, and non-sub-scanning field of lighting a lamp does not have continuous situation more than 2.So can reduce the probability that writes discharge failure.
Therefore, in the present embodiment, with the stable gray scale that produces discharge, be the sort of shown in Fig. 2 A, the B in that non-sub-scanning field of lighting a lamp does not have continuous gray scale more than 2 in the maximum luminance weighted sub-scanning field of lighting a lamp luminance weighted less than having, as " show and use gray scale ".
In Fig. 1, PDP33 is configured to electrode rectangular, carries out the luminous display device of two-value of ON or OFF.In the present embodiment, as telling about in the prior art, in PDP33, carry out many gray scales by a plurality of sub-scanning fields that are weighted respectively and show.
A/D transducer 11, the rgb signal with input carries out analog-to-digital conversion (hereinafter to be referred as " A/D conversion ").
Rgb signal through the A/D conversion carries out inverse gamma correction by inverse gamma correction device 13.In other words because rgb signal is to send here with the gamma characteristic that is shown as prerequisite on the CRT display device, so by inverse gamma correction with this resorting characteristics.
In motion detector 15, detect animation part through the rgb signal of A/D conversion.When detecting animation part, as output, output " 1 ", otherwise just output " 0 "., between 2 continuous sub-scanning fields, obtain gray-scale value poor of pixel here, when the absolute value of this difference surpasses institute's definite value, with this pixel as animation part.As in the present embodiment fixed value, add up at 255 o'clock in the weighting of all sub-scanning fields, about 10～30 is suitable.
Then, come the output of autokinesis detector 15 and inclination detector 37, and the rgb signal behind the inverse gamma correction, be transfused to greyscale transformation unit 17, by greyscale transformation unit 17 and the 1st diffusion unit 19, suppress the processing of the generation of the doubtful profile of animation, and the processing between the discontinuous gray scale of completion of the stability of assurance discharge.
Here, greyscale transformation unit 17, to the picture intelligence of input, will as greater than certain fixed value and be the pixel that detects behind sloping portion and the animation part, as the object pixel; With the pixel beyond the object pixel, as the non-object pixel.Then, to the object pixel, with the gray scale of object pixel, be transformed into from show with select in the gray scale, the 1st gray scale of the mean value of 4 gray scales for example.In addition, to the non-object pixel,, be transformed into the demonstration gray scale with the gray scale of non-object pixel.To this, will describe in detail later.
In addition, 4 gray scales that the 1st diffusion unit 19 uses just now to the 1st gray scale of greyscale transformation unit 17 outputs, are carried out the 1st average DIFFUSION TREATMENT of spatiality and/or timeliness ground.To this, also will describe in detail later.
Picture intelligence by 19 outputs of the 1st diffusion unit is transfused to picture intelligence-sub-scanning field corresponder 25.Picture intelligence-sub-scanning field corresponder 25 is transformed into scanning field information with picture intelligence.Whether so-called " scanning field information " makes a plurality of bits of each sub-scanning field luminous (lighting a lamp) constitute by expression.
Now, use Fig. 3, Fig. 4 to tell about this situation.Fig. 3 is the figure of expression from the gray scale 31～56 of Fig. 2 A extraction, and Fig. 4 is an expression inclination animation region, the figure of the sample attitude that moves to horizontal direction on the picture of PDP33.
Dotted arrow shown in Figure 3 is represented inclination animation region shown in Figure 4 when the direction shown in the arrow of Fig. 4 moves, the moving of the sight line when following it with eyes.When observation resembles image the arrow of Fig. 4 mobile, for example be about in the scope of " 31 "～" 35 ",,, can observe the doubtful profile of animation although the place takes place and degree changes according to moving of image at gray-scale value.When following the sort of image shown in Figure 4 mobile with eyes, during 1 scanning field in, dotted arrow as shown in Figure 3 is such, appearance can not be observed luminous zone.Its result, this zone can be observed with the value of original brightness " 31 "～" 35 " and compare, the doubtful profile of very dark animation.In other words, because of sight line moves, can be on retina form that the binary picture that shows with each sub-scanning field little by little staggers, overlapping resembling.At this moment, as shown in Figure 3, having in 1 scan period than in the little luminance weighted non-sub-scanning field of lighting a lamp of the high-high brightness weighting in the sub-scanning field of lighting a lamp, the non-sub-scanning field of lighting a lamp (below be called " middle the non-sub-scanning field of lighting a lamp ") with high-high brightness weighting, overlapping on retina, as being observed with the doubtful profile of the animation of comparing extremely dark part on every side.
Like this, by moving of the inclination of the gray scale of image and image specific zone, concentrate when existing when the gray scale that has adjacent sub-scanning field as " the middle non-sub-scanning field of lighting a lamp ", can produce the doubtful profile of animation.For example, as shown in Figure 3, " 40 " this gray scale has SF5 as the non-sub-scanning field of lighting a lamp in centre." 48 " this gray scale has SF4 as the non-sub-scanning field of lighting a lamp in centre.In other words, " 40 " and " 48 " are the gray scales that has in abutting connection with the middle non-sub-scanning field of lighting a lamp.Equally, " 40 " " 48 " " 52 " " 54 " " 55 " are the gray scales that has in abutting connection with the middle non-sub-scanning field of lighting a lamp.In the part that gray scale tilts, these gray scales are dull mostly to be reduced or the arrangement of monotone increasing the earth.Like this, when sight line is followed the gray scale sloping portion when moving, non-overlapping the resembling of sub-scanning field of lighting a lamp in the middle of forming on nethike embrane is so can observe the doubtful profile of animation.Hence one can see that, gray scale tilt and also the zone of moving in, do not make the gray scale that has in abutting connection with the middle non-sub-scanning field of lighting a lamp arranged side by side, can reduce the doubtful profile of animation.
Therefore, in the present embodiment, from showing with selecting the individual demonstration gray scale of n (n is the integer more than 2) the gray scale, and make that at least one is included in the non-sub-scanning field of lighting a lamp that has than having the high-high brightness weighting in the little luminance weighted non-sub-scanning field of lighting a lamp of the high-high brightness weighting in the sub-scanning field of lighting a lamp in n demonstration usefulness gray scale---" the middle non-sub-scanning field of lighting a lamp " different gray scale.That is to say, the greyscale transformation of object pixel is become the 1st gray scale, and the 1st gray scale is from showing with the gray scale, select n " the middle non-sub-scanning field of lighting a lamp " non-conterminous gray scale, getting their mean value again.Then,, the 1st gray scale is carried out spatial the 1st average DIFFUSION TREATMENT of timeliness with n demonstration gray scale, thus its gray scale of doubtful sex expression.Like this, because the gray scale that has in abutting connection with the middle non-sub-scanning field of lighting a lamp is not arranged, so can make the doubtful profile of animation not eye-catching.
In addition, in the picture intelligence, in the low part of gray-scale value, because be not easy to see the doubtful profile of animation, so do not carry out the processing of the non-sub-scanning field of lighting a lamp in the middle of the above-mentioned diffusion during display gray scale.
The 1st diffusion unit 19 for example is the addition of matrices circuit, to the gray scale of greyscale transformation unit 17 output, carry out according to Fig. 5, additive quantity shown in Figure 6 fixed DIFFUSION TREATMENT---the 1st DIFFUSION TREATMENT.To this, will describe in detail later.
Here, the 1st gray scale of in Fig. 5, representing as 1LUT, by the demonstration that will from Fig. 6, represent as 2LUT with after 4 gray scales of a selection are average, working out in the gray scale.For example, " 10 " this gray scale in the 1st gray scale (1LUT) shown in Figure 5 is with " 5 ", " 7 " in the demonstration usefulness gray scale (2LUT) shown in Figure 6, " 13 ", " 15 " average afterproduct.Why will select to show every one and use gray scale, be for the non-non-conterminous gray scale of sub-scanning field of lighting a lamp in the middle of using as far as possible.Through after such selection, in the 1st DIFFUSION TREATMENT of telling about later, the gray scale that has behind the middle non-sub-scanning field of lighting a lamp of adjacency can be not arranged side by side, so can suppress the doubtful profile of animation.
Fig. 7 A is the block scheme of the brief configuration of the greyscale transformation unit 17 in the expression present embodiment, and Fig. 7 B, C are the figures of telling about the action of the greyscale transformation unit 17 in the present embodiment.Greyscale transformation unit 17 has: obtain the output of autokinesis detector 15 and from the AND gate 50 of the logic product of the output of inclination detector 37 with have the LUT53 of 1LUT and 2LUT.And then, can also have and carry out error diffusion processing circuit---the 2nd diffusion unit 60 and the totalizer 51 that error diffusion is handled.Like this, the image transform of input is become the 1st gray-scale value or show with behind the gray-scale value, compare with the grey that image before the conversion has, grey has reduced.Even but at this moment, if take to have the structure of the 2nd diffusion unit 60 and totalizer 51, just can display gray scale the image of the slyness of sense of continuity invariably.In Fig. 8, the brief configuration of the image display apparatus when representing that with block scheme greyscale transformation unit 17 has the 2nd diffusion unit 60 and totalizer 51.
Below, use Fig. 7 A, B, C to tell about the action of greyscale transformation unit 17.
LUT53 is output as 1 in AND gate 50, i.e. the output of motion detector 15 is 1, and inclination detector 37 is selected 1LUT when being output as 1 object pixel; In logic product is 0, promptly during the non-object pixel, selects 2LUT.And LUT53 is according to the gray scale of the pixel of inverse gamma correction device 13 input, selects to export after the gray scale near pixel from 1LUT or 2LUT.In other words, the gray-scale value of pixel when the non-object pixel, is transformed into the demonstration gray scale; When the object pixel, be transformed into the 1st gray scale.
After the picture intelligence that comprises the half-tone information of pixel inputs to totalizer 51 by inverse gamma correction device 13, according to the original gray scale of the pixel of this picture intelligence with by the error e addition of the pixel diffusion of before this pixel, handling, by LUT53 and 60 outputs of the 2nd diffusion unit.
The 2nd error diffusion of the peripheral pixel diffusion of the pixel that error diffusion processing circuit---the 2nd diffusion unit 60 is obtained by difference---the error e of gray scale after the LUT53 conversion and the gray scale before the conversion ', carry out this error e ' in handling is handled.Handle by whole image being carried out the 2nd error diffusion, in whole image, preserve and want gray-scale displayed, when watching whole image, in people's eye, showing as the brightness of seeing original pixel.Like this, can show and do not have mixed and disorderly phenomenon, high-quality image.In the structure that the 2nd diffusion unit 60 is set, the gray-scale value of LUT53 output is before input the 1st diffusion unit 19, by 60 outputs of the 2nd diffusion unit.
The action of the 2nd diffusion unit 60 is as follows.
The 2nd diffusion unit 60 shown in Fig. 7 A, is made of subtracter 61, delayer 63,65,67,69, multiplier 71,73,75,77 and totalizer 79.In subtracter 61, from the gray scale after the original gray scale addition of propagated error e and pixel, deduct the gray scale of LUT53 output, obtain the poor of them---error e '.Error e ' be transfused to delayer 63 and delayer 69.
To error e
1' with multiplier 73 with fixed COEFFICIENT K 1 multiply each other.Equally, to error e
2' with multiplier 75 with fixed COEFFICIENT K 2 multiply each other, to error e
3' with multiplier 77 with fixed COEFFICIENT K 3 multiply each other, to error e
4' with multiplier 71 with fixed COEFFICIENT K 0 multiply each other.At this moment, each COEFFICIENT K 0, K1, K2, K3 set the suitable value that satisfies relational expression K0+K1+K2+K3=1 for.Then, with the output addition of totalizer 79, its result is exported as the propagated error e for pixel each multiplier 71,73,75,77.In other words, in the 2nd diffusion unit 60, shown in Fig. 7 C, the gray scale that pixel is original adds gray scale and poor with the gray scale after the LUT53 conversion---the error e behind the propagated error e ', use fixed ratio K0～K3 to the pixel diffusion of this pixel periphery.In addition, for the propagated error e of certain pixel, shown in Fig. 7 B, can be by obtaining after the error addition that will spread by the pixel of this pixel periphery.
With shown in the 2LUT of the 1LUT of Fig. 5 or Fig. 6, with the corresponding additive quantity of gray-scale value separately, by 4 of LUT53 outputs.In addition, with the gray scale additive quantity comparatively speaking of 2LUT output, all be 0.
In sum, greyscale transformation unit 17 with propagated error e addition, is exported the gray scale of the pixel of input image signal after the gray scale of the gray scale after the suitable performance of the selection addition.And then, also export for 4 additive quantities of this gray scale from influence signal and additive quantity.From the picture intelligence of greyscale transformation unit 17, be transfused to the 1st diffusion unit 19.
Below, tell about the action of the 1st diffusion unit 19.In the present embodiment, in the 1st diffusion unit 19, carry out the 1st DIFFUSION TREATMENT.The 1st DIFFUSION TREATMENT is carried out the matrix of K pixel * j capable (k, j are the positive integers that makes K * j=n) that the difference value by n gray scale calculating that the 1st gray scale uses and the 1st gray scale is constituted, with the addition of matrices processing of the visual addition that is transformed into the 1st gray scale.So the 1st diffusion unit 19 has the addition of matrices circuit, through the 1st DIFFUSION TREATMENT, only diffusion fixed additive quantity, thereby the 1st gray scale that will be transformed into by greyscale transformation unit 17, spatiality ground and/or timeliness ground are average.
Specifically, adopt following method to show the 1st gray scale.
Fig. 9 A, B are the figures that is illustrated in the matrix when carrying out the 1st DIFFUSION TREATMENT in the 1st diffusion unit 19.In the present embodiment, because n=4, institute is so that K=2, j=2, shown in Fig. 9 A, establishment will be with the 1st gray scale together by 4 additive quantity d1～d4 of LUT53 output as key element, have the matrix of 2 pixels * 2 row.Then, shown in Fig. 9 B, fill up the matrix of 2 pixels * 2 row.Follow again,, add the additive quantity that is in correspondence position the gray scale of each pixel after the 2nd DIFFUSION TREATMENT.
Here, d1～d4, become the 1st gray scale and the demonstration used in order to work out it with the difference of gray scale.Like this,, just become and show and use gray scale the result of d1～d4 and addition the 1st gray scale, thus spatiality ground on average after, just preserve the 1st gray scale.In addition,, make the change in location of d1～d4 by in each scanning field, can also average, preservation the 1st gray scale in timeliness ground.
The pictorial data that so obtains, even at sloping portion, the gray scale phenomenon side by side of the non-sub-scanning field adjacency of lighting a lamp in the middle of also not having.Therefore, even sight line is followed animation part, the middle non-sub-scanning field of lighting a lamp can be not overlapping yet on retina, can not observe the doubtful profile of big animation.For example, in the 1st gray scale, " 81 " this gray scale is showed with gray scale " 65 ", " 82 ", " 88 " " 90 " 4 demonstrations after average.The non-sub-scanning field of lighting a lamp in the centre of " 65 " is SF6.The non-sub-scanning field of lighting a lamp in the centre of " 82 " is SF4.The non-sub-scanning field of lighting a lamp in the centre of " 88 " is SF2.The non-sub-scanning field of lighting a lamp in the middle of in " 90 ", not having.In other words, in these 4 gray scales, there is not the non-sub-scanning field of lighting a lamp in adjacent centre.The 1st gray scale " 81 " after the 1st DIFFUSION TREATMENT, is diffused into this 4 gray scales, but because not in abutting connection with the middle non-sub-scanning field of lighting a lamp, so also can not produce the doubtful profile of bigger animation in the inclination field.If do not implement processing of the present invention, near the gray scale " 81 " will be with showing with the some performances in the gray scale " 74 " or " 82 " so.Because the middle non-sub-scanning field adjacency of lighting a lamp is so will produce the doubtful profile of bigger animation in the inclination field.
In sum, in the present embodiment, can suppress the gray scale that after " middle the non-sub-scanning field of lighting a lamp ", has at tilting zone and deposit and produce the doubtful profile of bigger animation.
But in the present embodiment, the 1st gray scale is that 0 o'clock additive quantity all is 0.
In addition, in the present embodiment, son is scanned number of fields be decided to be 10, but to the display device of son scanning number of fields arbitrarily, also can obtain effect with the same doubtful profile of inhibition animation of the present invention.
In addition, in the present embodiment, it is that 255 situation is told about that the weighting of whole sub-scanning fields is added up to.But, also can obtain effect with the same doubtful profile of inhibition animation of the present invention to having the display device of any weighting.
In addition, in the present embodiment, in order to work out the 1st gray scale, and from display gray scale, select 4 gray scales for use.But do not need to be defined as " 4 ", can use the gray scale of any amount.
In addition, in the present embodiment,, use the gray scale shown in Fig. 2 A, the B as " show and use gray scale ".But the present invention is not limited thereto, and the greyscale transformation of importing is become by after showing the 1st gray scale that is compiled into gray scale, is transformed into demonstration again and uses gray scale, also can obtain to suppress the effect of the doubtful profile of animation.
In sum, behind employing the present invention, the position producing the big doubtful profile of animation also can obtain following useful effect: can realize simultaneously keeping gray scale, simultaneously cut down the image display method and the image display apparatus of the doubtful profile of animation.
Claims (10)
1. an image display method adopts sub-scanning field method to carry out gray scale and shows, it is characterized in that:
Compare with having the maximum luminance weighted sub-scanning field of lighting a lamp, will have the less luminance weighted non-sub-scanning field of lighting a lamp does not have continuous gray scale more than 2 to use gray scale as showing,
For the motionless or gray-scale value viewing area of monotone variation not, will need gray-scale displayed, be transformed into described demonstration and show with the laggard row image of gray scale,
Viewing area for moving and gray-scale value monotone variation, to need gray-scale displayed, be transformed into according to making and show with in the gray scale, at least one is included in the non-sub-scanning field of lighting a lamp that has than having the high-high brightness weighting in the little luminance weighted non-sub-scanning field of lighting a lamp of the high-high brightness weighting in the sub-scanning field of lighting a lamp---the mode of the gray scale that " the middle non-sub-scanning field of lighting a lamp " is different, show the mean value of using gray scale from described demonstration with the n that selects the gray scale---after the 1st gray scale, carry out displayed image after the 1st DIFFUSION TREATMENT, described the 1st DIFFUSION TREATMENT is carried out will use in order to generate described the 1st gray scale described n and is shown with the capable matrix of k pixel * j that difference value constituted between gray scale and described the 1st gray scale, handle with the addition of matrices that is transformed into the visual addition after described the 1st gray scale, wherein, n is the integer more than 2, k, j is the positive integer that makes k * j=n.
2. image display method as claimed in claim 1, it is characterized in that: gray scale is used in described n demonstration, and wherein at least one is included in the non-different gray scale of sub-scanning field of lighting a lamp that has than having the high-high brightness weighting in the little luminance weighted non-sub-scanning field of lighting a lamp of the high-high brightness weighting in the sub-scanning field of lighting a lamp.
3. image display method as claimed in claim 1, it is characterized in that: before described the 1st DIFFUSION TREATMENT, obtaining greyscale transformation with arbitrary pixel in the viewing area becomes described demonstration with before gray scale or described the 1st gray scale and gray scale afterwards poor, peripheral pixel to described pixel, carry out with fixed ratio spread the 2nd DIFFUSION TREATMENT of described difference, and described fixed ratio and be 1.
4. image display method as claimed in claim 1, it is characterized in that: in the horizontal direction or in continuous m the pixel of vertical direction, wherein m is the integer more than 2, with dull increase of gray-scale value or monotone decreasing described m pixel after a little while, as the viewing area of described gray-scale value monotone variation; And a described continuous m pixel is at the number of picture elements that constitutes in the display frame below the above 15mm of 3mm.
5. image display method as claimed in claim 1, it is characterized in that: in the horizontal direction or in continuous m the pixel of vertical direction, wherein m is the integer more than 2, with dull increase of gray-scale value or monotone decreasing described m pixel after a little while, as the viewing area of described gray-scale value monotone variation; And a described continuous m pixel is the number of picture elements below 1.5% more than 0.3% at the transverse width of display frame.
6. an image display apparatus adopts sub-scanning field method to carry out gray scale and shows, it is characterized in that:
Compare with having the maximum luminance weighted sub-scanning field of lighting a lamp, will have the less luminance weighted non-sub-scanning field of lighting a lamp does not have continuous gray scale more than 2 to use gray scale as showing,
Comprise: for the motionless or gray-scale value viewing area of monotone variation not, will need gray-scale displayed, and be transformed into described demonstration and show with the laggard row image of gray scale; Viewing area for moving and gray-scale value monotone variation, to need gray-scale displayed, be transformed into according to making and show with in the gray scale, at least one is included in the non-sub-scanning field of lighting a lamp that has than having the high-high brightness weighting in the little luminance weighted non-sub-scanning field of lighting a lamp of the high-high brightness weighting in the sub-scanning field of lighting a lamp---the mode of the gray scale that " the middle non-sub-scanning field of lighting a lamp " is different, show mean value---the greyscale transformation unit of the 1st gray scale of using gray scale from described demonstration with the n that selects the gray scale, wherein, n is the integer more than 2; With
For the 1st gray scale from the output of described greyscale transformation unit, described n that carries out using in order to generate described the 1st gray scale shows with the capable matrix of k pixel * j that difference value constituted between gray scale and described the 1st gray scale, the 1st diffusion unit with the addition of matrices processing that is transformed into described the 1st image gray addition, wherein, k, j are the positive integers that makes k * j=n.
7. image display apparatus as claimed in claim 6, it is characterized in that: gray scale is used in described n demonstration, and wherein at least one is included in the non-different gray scale of sub-scanning field of lighting a lamp that has than having the high-high brightness weighting in the little luminance weighted non-sub-scanning field of lighting a lamp of the high-high brightness weighting in the sub-scanning field of lighting a lamp.
8. image display apparatus as claimed in claim 7, it is characterized in that: had before the processing of described the 1st diffusion unit, obtain and carry out conversion before with described greyscale transformation unit the gray scale of arbitrary pixel in the viewing area and the gray scale after the conversion poor, peripheral pixel to described pixel, carry out with fixed ratio spread the 2nd diffusion unit of described difference, and described fixed ratio and be 1.
9. image display apparatus as claimed in claim 6, it is characterized in that: in the horizontal direction or in continuous m the pixel of vertical direction, wherein m is the integer more than 2, with dull increase of gray-scale value or monotone decreasing described m pixel after a little while, as the viewing area of described gray-scale value monotone variation; And a described continuous m pixel is at the number of picture elements that constitutes in the display frame below the above 15mm of 3mm.
10. image display apparatus as claimed in claim 6, it is characterized in that: in the horizontal direction or in continuous m the pixel of vertical direction, wherein m is the integer more than 2, with dull increase of gray-scale value or monotone decreasing described m pixel after a little while, as the viewing area of described gray-scale value monotone variation; And a described continuous m pixel is the number of picture elements below 1.5% more than 0.3% at the transverse width of display frame.
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| PCT/JP2003/017018 WO2005066926A1 (en) | 2003-12-26 | 2003-12-26 | Image displaying method and image display |
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| CN100419831C (en) * | 2006-01-18 | 2008-09-17 | 四川世纪双虹显示器件有限公司 | Method for improving false contour of plasma image |
| JP5456372B2 (en) * | 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 | Display device |
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| US20010028347A1 (en) * | 1997-07-24 | 2001-10-11 | Isao Kawahara | Image display apparatus and image evaluation apparatus |
| US20030146910A1 (en) * | 2002-02-01 | 2003-08-07 | Pioneer Corporation | Method for driving a display panel |
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| JP3425083B2 (en) * | 1997-07-24 | 2003-07-07 | 松下電器産業株式会社 | Image display device and image evaluation device |
| JP3414265B2 (en) * | 1997-11-18 | 2003-06-09 | 松下電器産業株式会社 | Multi-tone image display device |
| US6965358B1 (en) * | 1999-01-22 | 2005-11-15 | Matsushita Electric Industrial Co., Ltd. | Apparatus and method for making a gray scale display with subframes |
| JP2002023692A (en) * | 2000-07-04 | 2002-01-23 | Matsushita Electric Ind Co Ltd | Display device and display method |
| WO2003091975A1 (en) * | 2002-04-24 | 2003-11-06 | Matsushita Electric Industrial Co., Ltd. | Image display device |
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| US20010028347A1 (en) * | 1997-07-24 | 2001-10-11 | Isao Kawahara | Image display apparatus and image evaluation apparatus |
| US20030146910A1 (en) * | 2002-02-01 | 2003-08-07 | Pioneer Corporation | Method for driving a display panel |
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