CN100573632C - By the method and apparatus of combined error diffusion with another dithering process video data - Google Patents
By the method and apparatus of combined error diffusion with another dithering process video data Download PDFInfo
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- CN100573632C CN100573632C CNB2005100849052A CN200510084905A CN100573632C CN 100573632 C CN100573632 C CN 100573632C CN B2005100849052 A CNB2005100849052 A CN B2005100849052A CN 200510084905 A CN200510084905 A CN 200510084905A CN 100573632 C CN100573632 C CN 100573632C
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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
- G09G3/2059—Display of intermediate tones using error diffusion
- G09G3/2062—Display of intermediate tones using error diffusion using error diffusion 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
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0247—Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
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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
- G09G3/22—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 using controlled light sources
- G09G3/28—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 using controlled light sources using luminous gas-discharge panels, e.g. plasma panels
- G09G3/288—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 using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels
Abstract
In order to improve gray level representation, use several dither methods: based on the shake of photovalve, the shake of many masks or error diffusion.In them each all has specified disadvantages.Their simple combination can not brought desired advantages.Yet, for example,, can improve if the result who many masks is shaken (4 ') by switch (8) is used for departure diffusion (2).
Description
Technical field
The present invention relates to a kind of method that is used to handle the video data that on the display device that has corresponding to a plurality of light-emitting components of the pixel of image, shows, wherein the time with frame of video or field is divided into a plurality of sons field, light-emitting component can be activated so that luminous in small-pulse effect at sub-field period corresponding to the subfield code word of n position, this subfield code word is used to encode and makes the luminous p of pixel possible video level, the method comprising the steps of: carry out the shake based on photovalve (cell), shake or many masks based on pixel are shaken to reduce quantization error, described each pixel or photovalve output jitter value " 1 " or " 0 " of being dithered as, photovalve is the light-emitting component of pixel; And each pixel or photovalve carried out error diffusion to reduce quantization error.In addition, the invention still further relates to a kind of corresponding device that is used for processing video data.
Background technology
It can only be matrix array " opening " or " pass ", the discharging light electric device that PDP uses.Simultaneously, unlike wherein controlling CRT or the LCD that represents gray level (grey level) by luminous simulation, PDP controls gray level by light pulse (the keeping pulse) quantity of the every frame of modulation.Will be by eyes synthetic this time modulation in corresponding to the time period of eyes time response (eye time response).Because video amplitude is described by the quantity of the light pulse that takes place with given frequency, so bigger amplitude means more light pulse, and, thereby mean more " opening " time.For this reason, such modulation PWM that is otherwise known as, width modulation (pulse width modulation).
This PWM will be responsible for one of PDP image quality issues: especially image than dark areas in gray level representation (the grey scale portrayal) quality of difference.This is due to the fact that the brightness of demonstration and the quantity of pulse are linear, but eyes are not linear to the response and the susceptibility of noise.Eyes are more responsive in than dark areas than in than bright area.This means: even current PDP can show the ca.256 gray scale that disperses, quantization error also will be very tangible in than dark areas.
In order to reach better gray level representation, in internal data is handled, before truncation (truncate) final video gray level amplitude resolution, dither signal is added to treated vision signal.Shake is the known technology in the technical literature, is used to reduce the influence that reduces the quantizing noise that produces owing to shown resolution figure place.By artificially adding rank in the centre, jitter improving gray level representation, but also added the jittering noise of high-frequency low amplitude, the observer only just can discover this jittering noise near viewing distance.Mainly contain two kinds of shakes that are used for PDP:
-based on the shake (EP1269457) of photovalve and improve version: many masks shakes (EP1262947), it has improved gray level representation, but has added the jitter mode (for example, interleaving mode (checker pattern)) of high-frequency low amplitude.The content of two documents is incorporated by reference herein.This notion of shake is based on the room and time complex functionality of eyes.In other words, the level between value 1 and 2 can be worth and shows by mix these simply on room and time.Yet, the low frequency flicker of not introducing interference more than 3 extra positions is provided can not for this method.The major advantage of this notion is that the factitious jitter mode that this method is introduced is difficult to find out at normal viewing distance.In addition, this method does not rely on picture material.
-error diffusion: it has improved gray level representation and has not produced jitter mode.This method is based on the distribution of fraction part to the adjacent light electric device.But it has added mainly than the noise in the dark areas (still image for not free noise becomes more obvious).In theory, more multidigit is provided for this method, but after certain restriction, is difficult to find out gain, increase noise on the contrary.At last, have the shortcoming that also adds visible noise at normal viewing distance even we can say this method, but it is more natural for moving image.In addition, this method depends on picture material.
To point out the necessity of shaking below in detail.As previously mentioned, plasma uses PWM (width modulation) to produce different shades of gray (shade of grey).The CRT that is pressed into approximate secondary relation with brightness and the cathodic electricity that is applied is different, and the quantity of brightness and discharge pulse is linear.Therefore, need before PWM, use the anti-gamma function of approximate figure secondary (degamma function).
Because this anti-gamma function, to less video level, many incoming levels are mapped to identical output level.In other words, to than dark areas, the output quantity of quantization is less than input quantity, and especially, the value less than 16 (when video input during with 8 work) is value of being mapped as 0 (this is corresponding to unacceptable 4 bit resolutions of video reality) all.In fact, under the situation of the gamma value 2.2 (normal video), the output valve of the input video level corresponding to 11 is:
Yet 8 displays as PDP can not provide fraction part.Therefore, if there is not other specific process, low incoming level all is mapped as 0 etc.
Yet as described above, shake is the known technology that is used to avoid losing the amplitude resolution position of wanting truncation.When to have only resolution be available before truncation, it was just effective, and this is current situation (if more multidigit is used for anti-gamma).Shake can recover the position with the as much of being lost by truncation in principle.Yet, utilize the quantity of shaking the position, the jittering noise frequency reduces, and therefore, becomes easier and perceive.
1 shake multiply by 4 corresponding to the shake of available output level quantity be multiply by 2,2, and 3 shake multiply by 8 with output level quantity.Because
And 0.00129 * 2
10〉=1, be 10 so pressure provides the quantity of the required decimal place of the first input video level (1).
Added to each photovalve of panel rather than be the jitter mode of each pixel of this panel (3 photovalves) definition based on the shake of photovalve.Panel pixel is made up of three photovalves: red, green and blue.This advantage that has is: provide trickleer jittering noise, thereby the observer is more subtle.This difference can directly be found out from Fig. 1.
Many mask shake expressions are based on the improvement version of the shake of photovalve, and it uses different types of shake function according to the fraction part that will provide.For example, for 3 shakes of 8 different fraction parts that can the value of providing x, with 8 different masks of following use (mask) (relatively EP 1 262 947):
X.000 and the input → mask 0 x.125 (complete 0 mask)
X.125 and the input → mask 1 x.250
X.250 and the input → mask 2 x.375
X.375 and the input → mask 3 x.500
X.500 and the input → mask 4 x.625
X.625 and the input → mask 5 x.750
X.750 and the input → mask 6 x.875
X.875 and the input → mask 7 between 1
Provided the example of some masks in the form below, wherein each frame or mask cover 4 * 4=16 photovalve.Mask 1 is the mask for the definition of 1/8 level, mask 2 is the masks for the definition of 1/4 level, mask 3 is the masks for the definition of 3/8 level, mask 4 is the masks for the definition of 1/2 level, mask 5 is the masks for the definition of 5/8 level, mask 6 is the masks for the definition of 3/4 level, and mask 7 is the masks for the definition of 7/8 level.
Select these patterns so that reduce the size, line flicker of noise static schema and the noise of introducing by asymmetric between the different jitter modes.The major advantage of this solution is: mask is to fix, and does not rely on the video content of image.Yet, can only provide 3, it is corresponding to minimum input value 8 (lost all values between 0 and 8, this can infer from the above-mentioned equation of anti-gamma function).
Different with shake, error diffusion is that a kind of for example integral part by the stick signal value quantizes the current pixel signal and subsequently quantization error (fraction part) is sent to neighborhood operation (neighbourhood operation) on the following pixel.Floyd and Steinberg (" An adaptive algorithm forspatial greyscale " in Proc.Soc.Information Display, 1976, vol 17, no.2, pp.75-78) by regulating and rounding off picture element signal (promptly, input pixel x[n]) define output pixel y[n], thereby y[n]=int (x[n]+x
e[n]), x wherein
e[n] is the error (fraction part) after the diffusion of accumulating during the iteration before, as
Y wherein
e[n] represents various fraction parts, such as y
e[n]=(x[n]+x
e[n])-y[n].
Although error diffusion image is for eyes (noise of introducing is similar to the natural video frequency noise) as snug as a bug in a rug, but this algorithm has produced some textures of not expecting (texture) (depending on picture material) really, these textures may be very disagreeable, and never can take place when the matrix solution of using as many mask shakes.
Error diffusion is handled and self is made up of three steps.At first, mistake error (being positioned at the last left of the current pixel) sum with original input value and diffusion forms amended input.Second step, this amended error rounded off produces output.As last step, calculate quantization error (all the other fraction parts) as the difference between amended input and the final output.Then, by the coefficient of selecting in various manners it is weighted this quantization error is propagated into neighbor.
Fig. 2 illustrates this principle.In the phase one of example, the value of current pixel is 4.5.Then, this value is rounded to 4, produces 0.5 error.Use three kinds of different coefficients with this error diffusion to three neighbor (right pixels is 0.5, bottom right pixel be 0.3 and following pixel be 0.2).Usually, select coefficient so that keep energy constant (the coefficient sum is 1).Good stable is necessary in image for keeping for this.After these steps, changed the value of three pixels:
4.85+0.5×0.5＝5.1
4.55+0.5×0.3＝4.7
5.10+0.5×0.2＝5.2
Then, will continue current pixel to handle with value 5.1.
The major defect of this notion is: it is to the dependence of picture material.In fact propagated error depends on the value of current pixel, and its influence is visible to its neighborhood pixels only, thereby this notion depends on image.In addition, very low level reproduction (rendition) be based on some mutually away from the propagation pixel, to such an extent as to this is can not have low-hanging fruit because propagated error is too little.At last, this effect is to the visible level of reality, not equal to be to low level noise.
On the other hand, the matrix shake of a kind of many masks based on photovalve arranged, 3 fraction parts can be provided in the mode that is difficult to find out, on the other hand, must reach 10 so that have the gray level quality of similar CRT standard.In addition, error diffusion oneself can provide more level, but with this noisy mode: last picture quality do not resemble it can be enhanced, the result is only better at far viewing distance, this is not the current very main application of giant-screen.
If can keep the major advantage of these two notions: use the more jitter mode that is difficult to find out of multidigit, then the combination of error diffusion and many masks shake may help to provide the position (will be that example is studied with 8) of more fraction parts in the lower part of this document.
Fig. 3 has shown the simple possibility that makes up these algorithms.
Generic representation method " 8.8 " meaning is 8 integers and 8 fraction parts.Owing to will handle 8 fraction part respectively, they are decomposed into 3 MSB that following 5 LSB, with " 3.5 " expression.At last, 16 information is represented with the form of 8.3.5 position.
In the situation of Fig. 3,8 digital video information are forwarded to anti-gamma square frame 1.This square frame 1 will be carried out the anti-gamma function of secondary with 16 bit resolutions, so that send the information of 8.3.5 position.5 lowest orders of the standard error diffusion principle of explanation diffusion before will in square frame 2, following.Therefore, after this square frame 2, has only 8.3 information (5 LSB that before spread are by totalizer 3 expressions).3 fraction part is used for selecting appropriate mask 4 from many mask shake functions 4,5, and (R, G or B) is applied to image with described function according to number of frames, location of pixels and color.In this position, the output valve of mask is 000 (corresponding to value " 0 ") or 111 (corresponding to value " 1 "), itself and current 8.3 place value additions.After this, simple truncation 6 will send 8 integers of standard to display 7.
Notion described here is simple and apparent.Yet, its cisco unity malfunction.In fact, in this notion, one connects another and uses two kinds of shakes independently.This is because with certain interference on the screen of the form of vertical or diagonal line periodic structure.These periodic structures are very disagreeable, and make most of shake function useless, thereby final, the reproduction of fraction part does not realize 8 target bit.
Summary of the invention
Consider these, the purpose of this invention is to provide the method and apparatus that is used for processing video data, it has guaranteed the better pictures quality.
According to the present invention, this purpose solves by a kind of method that is used to handle the video data that shows on the display device of the light-emitting component with a plurality of pixels corresponding to image, wherein the time with frame of video or field is divided into a plurality of sons field, can activate light-emitting component at sub-field period, so that it is luminous in small-pulse effect corresponding to the subfield code word of n position, this subfield code word is used to encode and makes the luminous p of pixel possible video level, the method comprising the steps of: carry out the shake based on photovalve, shake or many masks based on pixel are shaken to reduce quantization error, described each pixel or photovalve output jitter value " 1 " or " 0 " of being dithered as, photovalve is the light-emitting component of pixel; And each pixel or photovalve carried out error diffusion to reduce quantization error, wherein during error diffusion, if jitter value equals " 1 ", then the error diffusion with pixel or photovalve is added on the value of described pixel or photovalve.
In addition, a kind of equipment that is used to handle the video data that shows on the display device of the light-emitting component with a plurality of pixels corresponding to image is provided, wherein the time with frame of video or field is divided into a plurality of sons field, can activate light-emitting component at sub-field period, so that it is luminous in small-pulse effect corresponding to the subfield code word of n position, this subfield code word is used to encode and makes the luminous p of pixel possible video level, this equipment comprises: jittering device, be used to carry out shake based on photovalve, shake or many masks based on pixel are shaken to reduce quantization error, described each pixel or photovalve output jitter value " 1 " or " 0 " of being dithered as, photovalve is the light-emitting component of pixel; And disperser, be used for carrying out equally error diffusion, so that reduce quantization error; Wherein, the output signal of described jittering device is fed to described disperser, thereby if jitter value equals " 1 ", then the error diffusion with pixel or photovalve is added on the value of described pixel or photovalve.
Best, application error diffusion under based on the shake of photovalve, based on the control of the shake of pixel or the shake of many masks.Thereby, can avoid the artefact of disliking (artefact).
If jitter value is " 1 ", then pixel or photovalve are carried out error diffusion.Because jitter value is generally " 0 " or " 1 ", so these values also can be used as switch bit (switching bit).
Should be with more than n position process codewords, thus the fraction part of code word can be formed, and can application error diffusion on the position of all fraction parts.Yet,, obtain optimum if be used as the switch parameter that opens and closes error diffusion based on the shake of photovalve, the result who shakes based on shake or many masks of pixel.
Especially, the most significant digit of fraction part or a pair of most significant digit can be used for determining based on photovalve shake, based on the value of the shake or the shake of many masks of pixel.Like this, have only bigger quantization error to start error diffusion, and for less quantization error, the error diffusion of can add up a photovalve or a pixel.Therefore, can carry out error diffusion according to the content of image.If the indiffusion error then can be used for its storage pixel in the future.
The error that is added on pixel or the photovalve by error diffusion can be limited to maximum error.Best, this maximum error is 1.This restriction guarantees that error does not excessively increase.
Description of drawings
To be described in more detail the present invention in conjunction with the accompanying drawings now, wherein:
Fig. 1 shows based on the shake of pixel with based on the principle of the shake of photovalve;
Fig. 2 shows the principle of error diffusion;
Fig. 3 is the block scheme of the combination of many mask shakes and error diffusion;
Fig. 4 is according to the block scheme of the combination of the first embodiment of the present invention, improved many mask shakes and error diffusion; With
Fig. 5 is the block scheme of the second embodiment of the present invention.
Embodiment
Combined error diffusion and many masks/based on the subject matter of the shake of photovalve are the reproductions of the more multidigit of realization fraction part when reserved category is similar to the advantage of wobble structure of many masks.According to the present invention, this diffusion by all 8 fraction parts realizes, but error only is applied to the photovalve with many mask values 1.In order to determine the value of many masks, three most significant digits of fraction part will be selected.In Fig. 4, illustrate this notion.
8 digital video information of input are forwarded to anti-gamma square frame 1.This square frame 1 will be carried out quadratic function with 16 bit resolutions, so that transmit 8.3.5 position information.Complete information by totalizer 3 ', is imported into error diffusion square frame 2 thus.3 MSB of the fraction part of the output of next reflexive gamma square frame 1 are used to define the output of many masks shakes 4 ', are output as 1 or 0.Switch 8 is controlled by the output of many masks square frame 4 '.Under 1 situation, accept to be diffused into the error of this pixel, and before being sent to error diffusion square frame 2, this error is added on this pixel by totalizer 3 '.If many masks 4 ' are output as 0, the error of refusal diffusion then, and will be by switch 8 with this error error diffusion square frame 2 inside of reinjecting.The propagated error x that obtains
e' and fraction part y
e' be:
And
With only with many mask code matrixes mode application error diffusion of all advantages of keeping this notion.On the other hand, the value of using in many masks mode is 8 decimals, and follows the error diffusion principle.
As shown in Figure 4, because error can add up on the iteration of comparatively high amts (if often being dropped), the error of diffusion can reach 1.8.
If we use by the defined mask of the table that provides, then should carry out cycle arrangement so that error is added to appropriate position in the preface of this instructions:
X.000 and the input → mask 1 x.125 (corresponding to the mask of 1/8 level in the table of preface)
X.125 and the input → mask 2 x.250 (corresponding to the mask of 1/4 level in the table of preface)
X.250 and the input → mask 3 x.375 (corresponding to the mask of 3/8 level in the table of preface)
X.375 and the input → mask 4 x.500 (corresponding to the mask of 1/2 level in the table of preface)
X.500 and the input → mask 5 x.625 (corresponding to the mask of 5/8 level in the table of preface)
X.625 and the input → mask 6 x.750 (corresponding to the mask of 3/4 level in the table of preface)
X.750 and the input → mask 7 x.875 (corresponding to the mask of 7/8 level in the table of preface)
X.875 and the input → mask 8 between 1 (complete 1 mask)
Improvement embodiment of the present invention has been shown among Fig. 5.The error that is diffused into a pixel may be re-introduced into error diffusion square frame 2 inside owing to depend on many mask values, therefore understand easily: error may increase a lot.Therefore, the improvement of this notion is that the error limitation that will can be added to current pixel by limiter 9 is a maximal value.Reinjected once more error diffusion square frame inside other errors as shown in Figure 5.
The notion of upgrading is similar with notion before, and except the fact: the error limitation that will be added on the pixel is 1.0, and other errors of the error diffusion square frame inside of being reinjected once more are as follows:
The foregoing description is at PDP.Yet the digital indicator of any other kind can benefit from the present invention.
Claims (8)
1. one kind is used to handle the method that goes up the video data that shows at the display device (7) of the light-emitting component with a plurality of pixels corresponding to image, wherein the time with frame of video or video field is divided into a plurality of sons field, can activate light-emitting component at sub-field period, so that it is luminous in small-pulse effect corresponding to the subfield code word of n position, this subfield code word is used to encode and makes the luminous p of pixel possible video level, and the method comprising the steps of:
Execution based on the shake of photovalve, based on the shake of pixel or many masks shake (4 ') to reduce quantization error, described shake is for each pixel or photovalve output jitter value " 1 " or " 0 ", the output level of described jitter value " 1 " or " 0 " expression video level, photovalve is the light-emitting component of pixel; And
Each pixel or photovalve are carried out error diffusion (2) to reduce quantization error;
Be characterised in that:
During error diffusion, if described jitter value equals " 1 ", then the error of passing through the described error diffusion of execution (2) acquisition with pixel or photovalve is added on the signal value of described pixel or photovalve;
If described jitter value equals " 0 ", then described error is not added on the described signal value.
2. the method for claim 1, wherein with more than n position process codewords, make to form value between the value that the code word that is provided is provided, and error diffusion (2) is applied to each all in these values.
3. method as claimed in claim 2, wherein, the most significant digit of the fraction part of described signal value or a pair of most significant digit are used for determining the value of described shake.
4. as the described method of one of claim 1-3, wherein, to the add up error of diffusion of each photovalve or pixel.
5. as the described method of one of claim 1-3, wherein, the described error that is added on the signal value of described pixel or photovalve is limited to its maximal value.
6. method as claimed in claim 5, wherein maximum error is 1.
7. one kind is used to handle the equipment of going up the video data that shows at the display device (7) of the light-emitting component with a plurality of pixels corresponding to image, wherein the time with frame of video or video field is divided into a plurality of sons field, can activate light-emitting component at sub-field period, with luminous in small-pulse effect corresponding to the subfield code word of n position, this subfield code word is used to encode and makes the luminous p of pixel possible video level, and this equipment comprises:
Jittering device (4 '), be used to carry out shake based on photovalve, based on the shake of pixel or the shake of many masks to reduce quantization error, described shake is for each pixel or photovalve output jitter value " 1 " or " 0 ", the output level of described jitter value " 1 " or " 0 " expression video level, photovalve is the light-emitting component of pixel; With
Disperser (2) is used to carry out error diffusion, so that reduce quantization error;
Be characterised in that:
The output signal of described jittering device (4 ') is fed to described disperser (2), if thereby jitter value equals " 1 ", then the error of passing through the described error diffusion of execution (2) acquisition with pixel or photovalve is added on the signal value of described pixel or photovalve;
If described jitter value equals " 0 ", then described error is not added on the described signal value.
8. equipment as claimed in claim 7, wherein, to each photovalve or the pixel propagated error that adds up.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP04291878.9 | 2004-07-23 | ||
| EP04291878A EP1619651A1 (en) | 2004-07-23 | 2004-07-23 | Method and device for processing video data by combining error diffusion and dithering |
| EP04023434.6 | 2004-10-01 |
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| Publication Number | Publication Date |
|---|---|
| CN1725278A CN1725278A (en) | 2006-01-25 |
| CN100573632C true CN100573632C (en) | 2009-12-23 |
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| CNB2005100849052A Expired - Fee Related CN100573632C (en) | 2004-07-23 | 2005-07-25 | By the method and apparatus of combined error diffusion with another dithering process video data |
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| JP4549418B2 (en) * | 2008-03-04 | 2010-09-22 | シャープ株式会社 | Image processing apparatus, image processing method, image forming apparatus, program, and recording medium |
| US8787459B2 (en) * | 2010-11-09 | 2014-07-22 | Sony Computer Entertainment Inc. | Video coding methods and apparatus |
| CN105208363B (en) * | 2015-09-17 | 2018-02-09 | 暴风集团股份有限公司 | Method to trembling the compensation of tone integral quantization in color space conversion |
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| JP3354741B2 (en) * | 1995-04-17 | 2002-12-09 | 富士通株式会社 | Halftone display method and halftone display device |
| EP1262947B1 (en) * | 2001-06-01 | 2013-10-09 | Thomson Licensing | Method and apparatus for processing video picture data for a display device |
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2004
- 2004-07-23 EP EP04291878A patent/EP1619651A1/en not_active Withdrawn
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2005
- 2005-07-25 CN CNB2005100849052A patent/CN100573632C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| EP1619651A1 (en) | 2006-01-25 |
| CN1725278A (en) | 2006-01-25 |
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