CN101155287A - Video image processing method - Google Patents
Video image processing method Download PDFInfo
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- CN101155287A CN101155287A CNA2006100628374A CN200610062837A CN101155287A CN 101155287 A CN101155287 A CN 101155287A CN A2006100628374 A CNA2006100628374 A CN A2006100628374A CN 200610062837 A CN200610062837 A CN 200610062837A CN 101155287 A CN101155287 A CN 101155287A
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Abstract
The present invention discloses a method for processing video image, including the following steps: a. to calculate the pertinency of tow adjacent frame images; b. to confirm whether to insert black field or its duration or not according the pertinency of step one. The present invention overcomes the disadvantage of the existing technology, to calculate the pertinency of two adjacent frame images, then to decide whether to insert black field into the image according to the pertinency, which ensures the LCD motion image be not blurry and its brightness, and provides good display effect for user.
Description
Technical field
The present invention relates to the Display Technique field, specifically, relate to the technology that the LCD TV moving image is handled.
Background technology
LCD (liquid crystal display) TV progressively becomes the main flow tv product in market, its performance improves constantly, the visual angle problem solves substantially, but the shortcoming that also has other: image is fuzzyyer when showing the large-screen moving image, main cause one is that liquid crystal material responses speed is not high enough, and TFT-LCD is operated in the major reason that maintenance pattern (Hold-Type) is the generation motion image blurring.
Therefore, improving the blooming of moving image generation can be improved from two aspects, the one, improve response speed of liquid crystal, the 2nd, the retention performance of improvement TFT-LCD, and an important method improving the retention performance of TFT-LCD is to insert black, the present method of inserting black is to insert a fixing black field, arbitrary two field picture is eliminated the signal of each pixel of entire display screen in a certain fixing period, become one black, shorten the retention time of TFT-LCD from the angle of signal processing, thereby improved the picture display quality of moving image.On the other hand, all insert black field between each frame video signal shortened per horizontal-scanning interval of display part, with the requirement that increases greatly data speed and bandwidth, thus the difficulty and the cost of increase technology.
Therefore,, determine to insert black opportunity targetedly, reduce as much as possible and insert black frequency, so that be prior art an open question still to improving the fuzzy obvious effects that plays that moving image causes how according to the changing condition of video image.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of processing method of video image, shows fuzzy problem to improve LCD device moving image.
The technical scheme that technical solution problem of the present invention is adopted is as follows:
A kind of processing method of LCD TV moving image, described method comprises the steps:
The correlation of a, adjacent two two field pictures of calculating;
B, determine whether to insert black or insert black time that continues according to the correlation of adjacent two two field pictures.
The difference that the computational methods of the correlation of described adjacent two two field pictures comprise adjacent two two field pictures all the side and, the equal side and or calculate the weighting motion vector gained of two two field pictures of the absolute value of adjacent two two field pictures.
Inserting black time that continues determines by looking into the tables of data mode.
Whether whether black of insertion can be determined greater than the threshold value of black of the needs insertion of setting according to the value of calculating adjacent two two field picture correlations.
Black of described insertion is deceived a video data by one of input and is realized.
Realization backlight is controlled by output PWM duty cycle signals in the black field of described insertion.
The present invention overcomes the deficiencies in the prior art, adopt the correlation of calculating adjacent two two field pictures, in image, insert black technical scheme then according to the correlation decision of adjacent image, the assurance LCD unambiguous while of moving image has also guaranteed the brightness of image, provides better display effect to the user.
Description of drawings
Fig. 1 is for being embodiment of the invention system construction drawing;
Fig. 2 is the schematic diagram of black of the described insertion of the embodiment of the invention.
Embodiment
Basic principle of the present invention is to calculate the correlation of adjacent two two field pictures, judges whether to insert black or black time that continues of insertion according to correlation; Therefore, for the relative still frame or the less picture that moves,, can not insert black, thereby keep higher contrast ratio, and, insert the black field of certain hour, to alleviate the kinetic fuzzy pictures of image to motion picture because of picture does not almost have motion blur.
The characteristics of general television video frequency signal: the probability that the rapid movement image occurs is less, the probability that static relatively image occurs is bigger, change slower image for this class, when on liquid crystal display screen, showing, the common problem that can not occur bluring, therefore do not need to insert black this moment,, can influence the brightness of demonstration on the contrary if insert according to the scheme of prior art; To changing ratio image (moving image) faster, people's attentiveness mainly is placed in the motion, to concerns less (such as image brightness) such as movement backgrounds, can insert the black field of certain hour this moment, though insert black image brightness is exerted an influence, can solve the problem of motion image blurring.
Be elaborated below in conjunction with the drawings and specific embodiments.
The described system of the embodiment of the invention comprises memory and video frequency processing chip as shown in Figure 1, and wherein, memory is used for storing the data of all picture elements of current number two field picture, and the tables of data of inserting a black duration.
The schematic diagram that the described dynamic insertion of the embodiment of the invention is black as shown in Figure 2, the mode that can directly export by video data realizes, for comparing former frame the signal of obvious motion is arranged, the black field data that can be T2 in the back segment in this frame signal input lasting period, what each pixel of entire display screen showed all is that gray scale is a zero-signal, make whole screen become one black, shortened retention time of LCD, improve the quality of moving image from the angle of signal processing.
Black insertion meeting obviously reduces the brightness of display screen, and an alternative mode is corresponding grey of insertion and an image brightness mean value, to take into account the factor of brightness and two aspects of moving image quality.
Inserting black mode removes aforementioned by importing the mode of deceiving field data realizes, can also realize by output PWM duty cycle signals control mode backlight, but experiment shows, in duty ratio backlight is 70% when above, moving image produces to blur and does not have clear improvement, and 60% duty ratio is a more appropriate selection.Therefore in embodiment of the present invention the dynamic video signal is adopted 60% duty ratio,, can significantly improve the blooming that Dynamic Signal produces though sacrificed the brightness of picture to a certain extent.
In order to determine to insert the opportunity of black field targetedly, need make judgement to the moving situation of image frame, detailed process is as follows:
Vision signal three to four frames that prestore with input, then the image to front and back two frames compare, computing, calculate the correlation of adjacent two two field pictures, the correlation according to adjacent two two field pictures determines whether to be necessary to insert black again, and inserts black time that continues.
The correlation of the video image of concrete definite whole image can adopt following method:
Method one: the difference of calculating gray scale between the corresponding pixel of adjacent two two field pictures all the side and, with the equal side and of difference as judging whether need to insert black foundation, all side and big more shows that the gray scale between the pixel in adjacent two two field pictures changes greatly, and image motion is very fast.The difference of adjacent two two field pictures is all square and less or be zero, shows that the variation between the two frame pictures is more little, and image motion moves more slowly or not.Difference by calculating corresponding pixel between adjacent two frames all the side and mode judge the video image motion situation, and handle targetedly according to the moving situation of image, for the image motion very fast picture that compares, the corresponding insertion deceived the field, black time of inserting within the specific limits with difference all the side and size be directly proportional, if between adjacent two frames difference of corresponding pixel all the side and value less, it is shorter then to insert black time that continues.Black time that continues of concrete insertion can determine that described data are looked among the ROM that is stored in processor in advance by looking into the tables of data mode.In addition, black of insertion also can realize by the mode of setting threshold, if the difference of calculating corresponding pixel between adjacent two frames of gained all the side and value greater than preset threshold, then insert black, difference all the side and value less than preset threshold, then do not insert black.Thereby make black insertion decide, insert black when being necessary, reduce a black frequency of inserting to greatest extent, alleviate because of improving the fuzzy deficiency that causes the contrast reduction of image, thereby improve the quality of picture on the motion state of whole video image.
Method two: calculate gray scale between the corresponding pixel of adjacent two two field pictures difference absolute value and, with difference absolute value with as judging whether to need to insert black foundation, difference absolute value and big more, show that the gray scale between the pixel in adjacent two two field pictures changes greatly, image motion is very fast, and the duration that corresponding insertion is black is long more, difference absolute value and little, perhaps be zero, black the time that continues of insertion is short more, or does not insert black.Black time that continues of concrete insertion can determine that perhaps the mode of logical setting threshold realizes by the aforementioned tables of data mode of looking into.
Aforementioned variation total amount by gray scale between all pixels that calculate adjacent two two field pictures, though in the situation of change that to a certain degree reflects gray scale between adjacent two two field pictures, but movement relation that can accurately the reflecting video image, a method of judging the situation of image motion comparatively accurately is with the computed image motion vector, with the pixel is unit, by image is divided into 4 * 4, perhaps 8 * 8, the image block that the pixel of identical sizes such as 16 * 16 is formed, with searching near the finite region of back one two field picture piece (4 * 4 or 8 * 8 or 16 * 16) same position of former frame image, carry out correlation calculations, the mode of described correlation calculations can adopt difference all the side and or absolute value all the side and mode carry out, thereby find out maximally related zone, to determine the motion vector of an image block.Be weighted on average by motion vector each image block in the two field picture, calculate the motion vector of whole image, judge whether to need to insert black or insert black time that continues with the size of the value of the motion vector of weighting, the black field time of the big more corresponding insertion of the value of weighting motion vector is long more, black time that continues of concrete insertion can determine that perhaps the mode of logical setting threshold realizes by the aforementioned tables of data mode of looking into.Can judge the moving situation of picture data accurately by the mode of computed image motion vector, and determine whether to need to insert black or insert black opportunity time that continues with this, black of the insertion by pin is arranged with improve because of motion cause image blurring.
Claims (6)
1. the processing method of a video image is characterized in that, described method comprises the steps:
The correlation of a, adjacent two two field pictures of calculating;
B, determine whether to insert black or insert black time that continues according to the correlation of adjacent two two field pictures.
2. the processing method of video image according to claim 1, it is characterized in that, the difference that the computational methods of the correlation of described adjacent two two field pictures comprise adjacent two two field pictures all the side and, the equal side and or calculate the weighting motion vector gained of two two field pictures of the absolute value of adjacent two two field pictures.
3. the processing method of video image according to claim 1 is characterized in that, inserts black time that continues and determines by looking into the tables of data mode.
4. whether the processing method of video image according to claim 1 is characterized in that, whether insert black and can determine greater than the threshold value of black of the needs insertion of setting according to the value of calculating adjacent two two field picture correlations.
5. require the processing method of 1 to 4 described video image according to claim, it is characterized in that, black of described insertion is passed through black video data of input and is realized.
6. according to the processing method of the described video image of claim 1 to 4, it is characterized in that realization backlight is controlled by output PWM duty cycle signals in the black field of described insertion.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006100628374A CN101155287A (en) | 2006-09-25 | 2006-09-25 | Video image processing method |
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| CNA2006100628374A CN101155287A (en) | 2006-09-25 | 2006-09-25 | Video image processing method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101546540B (en) * | 2009-04-29 | 2011-10-05 | 深圳华映显示科技有限公司 | Grey insertion method and drive circuit for LCD display |
| CN107026978A (en) * | 2017-04-14 | 2017-08-08 | 珠海市魅族科技有限公司 | IMAQ control method and device |
| CN107071231A (en) * | 2017-04-14 | 2017-08-18 | 珠海市魅族科技有限公司 | Image change recognition methods and device |
| CN110473504A (en) * | 2019-08-06 | 2019-11-19 | 深圳创维－Rgb电子有限公司 | A kind of MINI LED backlight television image adjusting method and device |
-
2006
- 2006-09-25 CN CNA2006100628374A patent/CN101155287A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101546540B (en) * | 2009-04-29 | 2011-10-05 | 深圳华映显示科技有限公司 | Grey insertion method and drive circuit for LCD display |
| CN107026978A (en) * | 2017-04-14 | 2017-08-08 | 珠海市魅族科技有限公司 | IMAQ control method and device |
| CN107071231A (en) * | 2017-04-14 | 2017-08-18 | 珠海市魅族科技有限公司 | Image change recognition methods and device |
| CN110473504A (en) * | 2019-08-06 | 2019-11-19 | 深圳创维－Rgb电子有限公司 | A kind of MINI LED backlight television image adjusting method and device |
| WO2021022931A1 (en) * | 2019-08-06 | 2021-02-11 | 深圳创维－Rgb电子有限公司 | Image adjustment method and device for mini-led-backlit television |
| US11386856B2 (en) | 2019-08-06 | 2022-07-12 | Shenzhen Skyworth-Rgb Electronic Co., Ltd. | Method and device for adjusting mini led backlight television picture |
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