CN102082896A - Method for treating video of liquid crystal display device - Google Patents
Method for treating video of liquid crystal display device Download PDFInfo
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- CN102082896A CN102082896A CN2011100531100A CN201110053110A CN102082896A CN 102082896 A CN102082896 A CN 102082896A CN 2011100531100 A CN2011100531100 A CN 2011100531100A CN 201110053110 A CN201110053110 A CN 201110053110A CN 102082896 A CN102082896 A CN 102082896A
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Abstract
The invention discloses a method for treating a video of a liquid crystal display device, and in the method, interleaving and frame erasure techniques are utilized to lower the video image moving velocity so as to efficiently reduce the streaking phenomenon of the liquid crystal display device. The method comprises the following steps: 1) receiving and caching a to-be-displayed video signal; 2) estimating the motion of a continuous two-frame video and dividing a continuous three-frame video into a video with a smaller motion frame, a video with a proper motion frame and a video with a bigger motion frame; 3) performing frame erasure treatment on the video with the smaller motion frame, eliminating the middle frame of the continuous three-frame video, performing no treatment on the video with the proper motion frame, and performing interleaving treatment on the video with the bigger motion frame by using the interleaving technique based on bidirectional motion estimation and the motion compensation; and 4) finishing integrating the interleaved video and the frame-erased video with the original video and keeping a frame rate of the output video signal equal to the frame rate of the received video signal. The method is suitable for the current mainstream 50Hz/60Hz liquid crystal display device as well as high-class liquid crystal display devices, such as the 100Hz/120Hz/200Hz/240Hz liquid crystal display devices, and the like.
Description
Technical field
The present invention relates to a kind of method for processing video frequency, specifically, relate to a kind of video processing technique of the conditions of streaking at liquid crystal display.
Background technology
Liquid crystal display (LCD) is as a kind of technology with the fastest developing speed in the flat display technology, smooth solution along with problems such as its brightness, contrast and visual angles, its coloury advantage is not fully exerted, in the display effect of having caught up with even surpassed ripe CRT aspect the display effect of still image and text, its application has obtained great popularization.In recent years, be used in the LCD panel maximization development rapidly on PC and the TV, at present, the dealer just actively improves dynamic image quality with the LCD panel, and also there is a defective that is difficult to solve in LCD to the pictograph demonstration aspect of motion, the problem of hangover that Here it is.
Studies show that in recent years causes LCD to show that the reason of moving image hangover mainly contains following four aspects: 1) the slow-response process of LCD display material; 2) " sampling-maintenance " characteristic of LCD demonstration is exactly the display brightness that keeps each pixel in the refresh cycle that shows; 3) human visual system's (HVS) motion tracking characteristic; 4) human visual system's (HVS) low-frequency filter characteristics.
At present, scholar both domestic and external proposes various ways and improves the situation that this LCD shows the moving image hangover, mainly comprises: (1) improves the response speed of liquid crystal pixel; (2) retention performance of improvement LCD; (3) adopt image processing techniques.(1), (2) are always limited from the raising on the physical property, for example can not allow the response time of liquid crystal material infinitely small, generally can be between 100-200ms, adopt various technology can bring up to several milliseconds, response speed although it is so can have been improved conditions of streaking better, and for video image, frame per second is generally between 20-30, at this moment, the retention performance of liquid crystal is the principal element that causes hangover.Even studies show that the response time of liquid crystal material is zero, when showing dynamic video, still have conditions of streaking.
In recent years, liquid crystal display frequency doubling technology (claiming frame rate up-conversion again) from original 50HZ/60HZ, is brought up to 100HZ/120HZ with the liquid crystal display shows signal, even 200HZ/240HZ, solve liquid crystal display to a certain extent and shown the conditions of streaking that dynamic video occurs.Why frequency doubling technology can improve conditions of streaking, main cause is: point out in " LCD MOTION BLUR MODELING AND ANALYSIS " literary composition according to Hao Pan etc.: the width at the fuzzy edge of liquid crystal display dynamic video image is that the movement velocity with the video image pixel is directly proportional, the relation of blurred width w and movement velocity v is approximately: w=0.8VT, T is the frame period, v is that the image edge is along x axle movement velocity, can reduce the movement velocity at image edge by frequency doubling technology, thereby effectively reduce the liquid crystal display conditions of streaking.
The liquid crystal display frequency doubling technology is meant the time point that does not have local reference information between two frames, utilizes the signal reconstruct image of adjacent two frames.The basic principle of frequency doubling technology as shown in Figure 2, T represents the time interval between original sequence two successive frames among the figure, is called the frame period, F
T-1And F
T+1Be incoming frame sequence, F
tFor treating interleave, suppose f
InBe the frame per second of input image sequence, f
OutIntroducing parameter k for the frame per second of output image sequence is the frame frequency lifting factor, i.e. f
Out=kf
In, suppose F
T-1In 1 A, behind the elapsed time T, moved a motion vector V
i, moved to F
T+1B point in the frame, P point are is treating interleave F
tIn treat interpolated point.What the algorithms of different of frame rate up-conversion referred to is exactly to insert F
tDistinct methods, promptly how to obtain the pixel value that P is ordered, whether carried out estimation and corresponding motion compensation according to algorithm, can be divided into non-motion compensation interleave and motion compensation interleave to algorithm.Non-motion compensation interleave algorithm is not considered object of which movement, directly utilizes the various combination interpolations of consecutive frame to go out intermediate frame, and for example frame repeats and frame is average.When although there is not object of which movement in these methods at image, can access the acceptable interleave for the treatment of of quality, but transport when big when there is object in image, the interpolation effect can be very poor, frame repeats to produce the tangible motion jumping phenomenon of moving object, and frame on average can produce tangible bluring at the moving object edge.In order to reduce motion sudden change and fuzzy, motion compensation interleave algorithm uses object of which movement information, adopt estimation to obtain motion vector, and then motion compensated interpolation obtains treating interleave.
Though adopting the liquid crystal display frequency doubling technology is a kind of good method of improving the liquid crystal display conditions of streaking, but this method can increase the liquid crystal display cost, and the liquid crystal display of the 50HZ/60HZ that adopts for present domestic consumer's main flow is unpractical.Therefore, be necessary to propose a kind ofly can improve present main flow liquid crystal display and show that the method for conditions of streaking appears in dynamic image.
Summary of the invention
At above deficiency, the invention provides a kind of employing interleave and frame losing technology and effectively reduce video image pixel motion speed, thereby effectively reduce the method for processing video frequency of the liquid crystal display of liquid crystal display conditions of streaking, it comprises:
1) receives vision signal to be shown, carry out buffer memory;
2) vision signal of buffer memory is classified;
3) sorted vision signal is carried out interleave and frame losing processing;
4) finish the integration of interleave video, frame losing video and original video, keep the frame per second of the vision signal that the frame per second of outputting video signal equals to receive.
Described step 2) also comprise:
21) continuous videos that receives is carried out block-based estimation, obtain motion vector MV(f
n, f
N+1) and MV(f
N+1, f
N+2);
22) according to motion vector MV(f
n, f
N+1) and MV(f
N+1, f
N+2), raw video signal is classified;
F wherein
n, f
N+1, and f
N+2Be three continuous frame original videos, n is a natural number.
Described step 21) adopt the block-based motion estimation algorithm of full search that the two continuous frames video is carried out block-based estimation, the size of piece is 16x16;
Described step 22) the continuous three frame videos that receive are classified, sorted video comprises the very little video of motion picture, moderate video and the very big video of motion picture of motion picture, and the video that described motion picture is very little is meant MV(f
n, f
N+1) and MV(f
N+1, f
N+2) value all less than threshold values T1; The moderate video of described motion picture is meant MV(f
n, f
N+1) and MV(f
N+1, f
N+2) one of them is worth greater than threshold values T1, less than threshold values T2, another is worth less than T2; The frame of video that described motion picture is very big is meant MV(f
n, f
N+1) and MV(f
N+1, f
N+2) value have one at least greater than threshold values T2, wherein threshold values T1 is less than threshold values T2.
Described step 3) is meant: the video that motion picture is moderate is not handled; The very little video of motion picture is carried out frame losing handle, the frame of the centre of continuous three frame videos is removed; The very big video of motion picture is carried out interleave to be handled.
Described step 3) adopts based on the interleave technology of bi-directional motion estimation and motion compensation carries out the interleave processing to the very big video of motion picture.
A frame video that is inserted in the very big video of motion picture in the described step 3) no longer participates in estimation, directly output.
It adopts a counter to carry out receiver, video, interleave and frame losing control, and the initial value of counter is made as 0, and maximum is by the size decision of memory, and the minimum value of counter is 2, to guarantee can to form continuous three frame videos at least in the memory.
Beneficial effect of the present invention: the present invention does not handle the video that motion picture is moderate by continuous three frame videos being divided into three types of the very big videos of moderate video of the very little video of motion picture, motion picture and motion picture; The very little video of motion picture is carried out frame losing handle, the frame of the centre of continuous three frame videos is removed; The very big video of motion picture is carried out interleave to be handled, can effectively reduce the movement degree of picture, and then improved the conditions of streaking of liquid crystal display, in addition, the present invention both had been suitable for the 50HZ/60HZ liquid crystal display of present main flow, also was suitable for liquid crystal displays such as high-end 100HZ/120HZ/200HZ/240HZ.
Description of drawings
Fig. 1 is a method for processing video frequency flow chart of the present invention;
Fig. 2 is the basic principle figure of traditional frequency doubling technology;
Fig. 3 is a visual classification schematic diagram of the present invention;
Fig. 4 is video interleave of the present invention and frame losing schematic diagram;
Fig. 5 is a bi-directional motion estimation theory diagram of the present invention;
Fig. 6 is that the video cycle after video interleave of the present invention and the frame losing changes schematic diagram.
Embodiment
Below in conjunction with accompanying drawing the present invention is further set forth.
The objective of the invention is at present main flow liquid crystal display provides a kind of method of improving conditions of streaking at the conditions of streaking that shows that dynamic video can show, and need not change liquid crystal display, and this method can effectively be improved the quality that dynamic video shows.
As shown in Figure 1, the method for processing video frequency of liquid crystal display of the present invention comprises:
One, receives vision signal to be shown, carry out buffer memory.
A counter that is used to calculate frame number is set, and the memory that is used for the buffer memory video, wherein, the initial value of counter is 0, the size decision of maximum memory, and the minimum value of counter is 2, to guarantee can to form continuous three frame videos at least in the memory.The beginning receiver, video, and store (vision signal), every storage one frame video, counter adds 1.
Two, the vision signal of buffer memory is classified.
After the two frame videos of buffer memory in the memory, promptly counter equals 2, and the first frame video f1 and the second frame video f2 that is cached to memory carried out block-based estimation, obtains motion vector MV(f1, f2); In the memory after buffer memory the 3rd frame video f3, counter equals 3, the second frame video f2 and the 3rd frame video f3 that is cached to memory carried out block-based estimation, obtain motion vector MV(f2, f3), the present invention pays the utmost attention to and adopts the block-based motion estimation algorithm of full search to carry out the block-based estimation of two continuous frames video, and the size of piece is 16x16;
According to above-mentioned MV(f1, f2) and MV(f2, f3) result, contrast threshold values T1 and T2, the continuous three frame videos that are cached to memory are classified, and sorted video comprises the very little video of motion picture (category-A), video (category-B) and the moderate video (C class) of motion picture that motion picture is very big.As shown in Figure 3, the video that described motion picture is very little is meant MV(f1, f2) and MV (f2, value f3) is all less than threshold values T1; The moderate video of described motion picture is meant MV(f1, f2) and MV (f2, f3) one of them the value greater than threshold values T1, less than threshold values T2, another is worth less than T2; The frame of video that described motion picture is very big is meant MV(f1, f2) and MV (f2, value f3) has one at least greater than threshold values T2, wherein threshold values T1 is less than threshold values T2, threshold values T1 and T2 value are at different video resolutions and difference is decided according to actual conditions, and its unit is a pixel/frame.
Three, sorted vision signal is carried out interleave and frame losing processing.
As shown in Figure 4, according to the classification of continuous three frame videos in the step 2, for the very little frame of video of motion picture, we take the frame losing technology, a frame in the middle of removing between continuous three frames; For the very big frame of video of motion picture, we adopt the interleave technology, adopt based on estimation and motion compensation interleave technology; The video moderate to motion picture do not handled, and directly output, an and frame video that is inserted in the very big video of motion picture no longer participates in estimation, directly output.
The present invention adopts counter to control the quantity of interleave/frame losing, when counter equals 3, begins to carry out video output.Every output one frame video is deleted this frame video from memory; Every insertion one frame, counter adds 1; Whenever lose a frame, counter subtracts 1; The counter minimum value is 2, promptly when counter is 2, promptly stops frame losing; The maximum of counter is by the size decision of the size and the frame of video of memory, and be set to 5 here; When counter less than peaked the time, if video belongs to the very big frame of video of motion picture (the picture motion is violent), promptly carry out interleave.When counter equals 5, stop interleave.
The video very big to motion picture (category-B) carries out interleave to be handled, and we adopt the interleave technology based on estimation and motion compensation here.Wherein, if estimation adopts one-way movement to estimate, overlapping and empty problem is inevitably, adopts bi-directional motion estimation, and the motion vector of direct estimation interpolation frame can solve overlapping and empty problem.For a piece of interpolation frame, by the piece at certain displacement place in its former frame relatively and the piece of opposite displacement place of a frame thereafter, find to make the motion vector of both the most similar displacements as this piece, the bi-directional motion estimation principle as shown in Figure 5, f
N-1, f
nAnd f
N+1Represent reference frame, interpolation frame and present frame respectively, s is the two-dimensional vector of remarked pixel locus, and v is the motion estimation vectors of each interpolated pixel, F
n[s] is the pixel value of the s position, space of n frame, B
I, jA piece of expression interpolation frame.Suppose its motion vector in [a, a],, calculate this piece at preceding frame f to each the candidate motion vector v in this scope
N-1In move-v after and back frame f
N+1In move+v after each pixel of corresponding blocks two-way absolute difference and (SBAD:of bilateral absolute difference):
The v that searches the SBAD minimum value in [a, a] is the estimated motion vector of this piece.
Because, the interleave device to the motion vector accuracy requirement than higher, after the bi-directional motion estimation, motion vector is revised, we adopt vector median filtering to carry out the motion vector correction here, after the vector correction again, need carry out motion compensation, carry out interpolation and come heavy interpolation frame, we adopt the motion compensation process of medium filtering here, interleave piece B
OutFor:
Wherein, the median function is the medium filtering function.
Digital Television with present China is an example, carry out interleave and frame losing after, the frame per second of vision signal changes referring to Fig. 6, the frame period of input video is 16.67ms, and after carrying out interleave, video frame period becomes 8.83ms, after carrying out frame losing, video cycle becomes 33.34ms.
Four, finish the integration of interleave video and original video frame, the frame per second of the vision signal that the frame per second of maintenance outputting video signal equals to receive.
When counter equals 3, begin to carry out video output, the original video, frame losing video and the interleave video that are stored in the memory are integrated, refresh rate 50HZ/60HZ liquid crystal display for present main flow, the speed of maintenance video output streams equals the input rate of original video stream, in the present embodiment, referring to Fig. 6, keeping the frame period of video is 16.67ms.
The process of image processing is described with regard to instantiation below, such as may there be several situations in f1 ~ f5: (following K is the piece number of every frame video) for the five continuous frame videos of input
1, receives and store the first frame video f1 and the second frame video f2 earlier, the first frame video f1 and the second frame video f2 are carried out estimation obtain MV
1KIf, MV
1KIn value all less than T1, then memory receives and stores the 3rd frame video f3, again the second frame video f2 and the 3rd frame video f3 is carried out estimation and obtains MV
2KIf, MV
2KIn value also all less than T1, then be classified as category-A, i.e. the very little video of motion picture need carry out frame losing and handle, lose the second frame video f2, counter subtracts 1, and Counter Value is 2, carries out video output f1 this moment, receive simultaneously and store video f4, to (f3 f4) carries out estimation; Carry out video output f3 this moment, receive simultaneously and store video f5; F3, f4 and f5 form new continuous three frame videos, again to (f4 f5) carries out estimation, and to f3, f4 with the f5 frame is classified and corresponding processing, this hour counter is 2, and continuous three frame videos stop the frame losing operation.
2, receive and store the first frame video f1 and the second frame video f2 earlier, the first frame video f1 and the second frame video f2 are carried out estimation obtain MV
1KIf, MV
1KValue all less than T1, then memory receives and stores the 3rd frame video f3, again the second frame video f2 and the 3rd frame video f3 is carried out estimation and obtains MV
2KIf, MV
2KIn value all greater than T1, and, then be classified as the C class less than T2, promptly the moderate video of motion picture is not handled.Because counter is 3, the video frame number is 3 in the memory, directly exports the first frame video f1, and receiving storage the 4th frame video f4, f2, f3 and f4 form new continuous three frame videos, again to (f3, f4) carry out estimation, and to f2, f3 with the f4 frame is classified and corresponding processing.
3, receive and store the first frame video f1 and the second frame video f2 earlier, the first frame video f1 and the second frame video f2 are carried out estimation obtain MV
1KIf, MV
1KValue all less than T1, then memory receives and stores the 3rd frame video f3, again the second frame video f2 and the 3rd frame video f3 is carried out estimation and obtains MV
2KIf, MV
2KIn value have one greater than T2, then be classified as category-B, i.e. the very big video of motion picture, need carry out interleave and handle, insert the fa2 frame between the second frame video f2 and the 3rd frame video f3, counter adds 1, because this hour counter is 4, the video frame number in the memory is 4; Output and deletion f1 receive and store f4, simultaneously to (f3 f4) carries out estimation; Output and deletion f2 receive and store f5, simultaneously to (f4 f5) carries out estimation; Output and deletion fa2 receive and store f6 simultaneously; F3, f4 and f 5 forms new continuous three frame videos, to f3, f4 with the f5 frame is classified and corresponding processing.
4, receive and store the first frame video f1 and the second frame video f2 earlier, the first frame video f1 and the second frame video f2 are carried out estimation obtain MV
1KIf, MV
1KIn value all greater than T1, and less than T2, then memory receives and stores the 3rd frame video f3, again the second frame video f2 and the 3rd frame video f3 is carried out estimation and obtains MV
2KIf, MV
2KIn value all less than T2 or T1, then be classified as the C class, promptly the moderate video of motion picture is not handled, and directly exports the first frame video f1 and receives storage the 4th frame video f4.F2, f3 and f 4 forms new continuous three frame videos, again to (f3 f4) carries out estimation, and to f2, f3 with the f4 frame is classified and corresponding processing.
5, receive and store the first frame video f1 and the second frame video f2 earlier, the first frame video f1 and the second frame video f2 are carried out estimation obtain MV
1KIf, MV
1KIn value have one greater than T2, then directly between the first frame video f1 and the second frame video f2, insert the fa1 frame, counter adds 1, this hour counter is 3, receives also storage f3, again the second frame video f2 and the 3rd frame video f3 is carried out estimation and obtains MV
2KIf, MV
2KIn the value neither one greater than T2, then do not carry out Video processing, continuous three frame video f1, f2 and f3 are classified as the very big video of motion picture (category-B).Output and deletion f1 and reception and storage f4; F2, f3 and f4 form new continuous three frame videos, again to (f3 f4) carries out estimation, and to f2, f3 with the f4 frame is classified and corresponding processing.
6, receive and store the first frame video f1 and the second frame video f2 earlier, the first frame video f1 and the second frame video f2 are carried out estimation obtain MV
1KIf, MV
1KIn value have one greater than T2, then directly between the first frame video f1 and the second frame video f2, insert the fa1 frame, counter adds 1, this hour counter is 3, receives also storage f3, again the second frame video f2 and the 3rd frame video f3 is carried out estimation and obtains MV
2KIf, MV
2KIn value have one greater than T2, then directly between the first frame video f2 and the second frame video fa3, insert the fa2 frame, the number devices add 1, this hour counter is 5, continuous three frame video f1, f2 and f3 are classified as the very big video of motion picture (category-B).Output and deletion f1 and reception and storage f4, output and deletion fa1 and reception and storage f5; F3, f4 and f 5 forms new continuous three frame videos, again to (f4 f5) carries out estimation, and to f3, f4 with the f5 frame is classified and corresponding processing, at this moment, even belong to the very big video of motion picture (category-B), does not also carry out the interleave operation.
The above only is a better embodiment of the present invention, the present invention is not limited to above-mentioned execution mode, in implementation process, may exist local small step to change, if change of the present invention is not broken away from the spirit and scope of the present invention, and belong within claim of the present invention and the equivalent technologies scope, then the present invention also is intended to comprise these changes and modification.
Claims (7)
1. the method for processing video frequency of a liquid crystal display is characterized in that, it comprises:
1) receives vision signal to be shown, carry out buffer memory;
2) vision signal of buffer memory is classified;
3) sorted vision signal is carried out interleave and frame losing processing;
4) finish the integration of interleave video, frame losing video and original video, keep the frame per second of the vision signal that the frame per second of outputting video signal equals to receive.
2. the method for processing video frequency of liquid crystal display according to claim 1 is characterized in that, described step 2) also comprise:
21) the continuous video that receives is carried out block-based estimation, obtain motion vector MV(f
n, f
N+1) and MV(f
N+1, f
N+2);
22) according to motion vector MV(f
n, f
N+1) and MV(f
N+1, f
N+2), raw video signal is classified;
F wherein
n, f
N+1, and f
N+2Be three continuous frame original videos, n is a natural number.
3. the method for processing video frequency of liquid crystal display according to claim 2 is characterized in that, described step 21) adopt the block-based motion estimation algorithm of full search that the two continuous frames video is carried out block-based estimation, the size of piece is 16x16;
Described step 22) the continuous three frame videos that receive are classified, sorted video comprises the very little video of motion picture, moderate video and the very big video of motion picture of motion picture, and the video that described motion picture is very little is meant MV(f
n, f
N+1) and MV(f
N+1, f
N+2) value all less than threshold values T1; The moderate video of described motion picture is meant MV(f
n, f
N+1) and MV(f
N+1, f
N+2) one of them is worth greater than threshold values T1, less than threshold values T2, another is worth less than T2; The frame of video that described motion picture is very big is meant MV(f
n, f
N+1) and MV(f
N+1, f
N+2) value have one at least greater than threshold values T2, wherein threshold values T1 is less than threshold values T2.
4. the method for processing video frequency of liquid crystal display according to claim 3 is characterized in that, described step 3) is meant: the video that motion picture is moderate is not handled; The very little video of motion picture is carried out frame losing handle, the frame of the centre of continuous three frame videos is removed; The very big video of motion picture is carried out interleave to be handled.
5. the method for processing video frequency of liquid crystal display according to claim 4 is characterized in that, described step 3) adopts based on the interleave technology of bi-directional motion estimation and motion compensation carries out the interleave processing to the very big video of motion picture.
6. the method for processing video frequency of liquid crystal display according to claim 4 is characterized in that, a frame video that is inserted in the very big video of motion picture in the described step 3) no longer participates in estimation, directly output.
7. the method for processing video frequency of liquid crystal display according to claim 6, it is characterized in that, it adopts a counter to carry out receiver, video, interleave and frame losing control, the initial value of counter is made as 0, maximum is by the size decision of memory, the minimum value of counter is 2, to guarantee can to form continuous three frame videos at least in the memory.
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