Motion estimation method of video coding
A motion estimation and video coding technology, applied in the field of motion estimation, can solve the problem of unsatisfactory matching effect of small-step block matching algorithm, and achieve the effect of good matching effect, stable performance and fast search speed.
Inactive Publication Date: 2013-11-27
WUHAN UNIV
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[0003] H.264 / AVC uses some classic small-step block matching algorithms, such as three-step method, new three-step method, four-step method, diamond method, hexagon method and other fast search algorithms. These algorithms are only applicable to Small step size search in H.264 / AVC (generally 2); HEVC follows the classic block-based hybrid coding framework, but because a larger coding unit is used to replace the macroblock in H.264 / AVC, This makes it necessary to use a larger search step size (the default is 64) when predicting, so this also makes some classic small-step block matching algorithms not ideal for matching in HEVC
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[0061] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0062] In order to describe the content of the present invention conveniently, some concepts are explained first; in the process of searching for matching points, based on such an assumption: the closer the matching point is to the global optimal point, the smaller the corresponding absolute value of error and SAD , and in the whole pixel search process, it is easy to fall into the local minimum situation, therefore, the model adopted in the sub-pixel motion vector search is not applicable to the whole pixel; and in the sub-pixel motion vector search, the present invention considers that the search The range is small enough, and the local minimum point at this time can be used as the global optimum point.
[0063] please see figure 1 , a specific embodiment of the present invention is a motion estimation method based on HEVC video coding, comp...
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The invention discloses a motion estimation method of video coding. The motion estimation method of video coding comprises the following steps of (1) obtaining an optimal motion vector of an adjacent area according to a motion vector of an adjacent block, carrying out initialized search on parameters, (2) carrying out full-pixel motion vector search to obtain a full-pixel optimal point, (3) carrying out full-pixel threshold value TH judgment on an SAD value corresponding to the full-pixel optimal point, and judging whether sub-pixel motion vector search needs to be carried out on the full-pixel optimal point, wherein when the SAD value is smaller than a TH, the sub-pixel motion vector search does not need to be carried out, the full-pixel optimal point is an overall optimal matching point, and when the SAD value is larger than or equal to the TH, the sub-pixel motion vector search is carried out to obtain a sub-pixel accuracy optimal point; comparing the sub-pixel accuracy optimal point with a full-pixel accuracy optimal point, and using the optimal point with the smaller SAD value as the overall optimal matching point; (4) obtaining an overall optimal motion vector according to an optimal motion vector of the adjacent area and the overall optimal matching point. The motion estimation method of the video coding is high in search speed and stable in performance, and has the good matching effect on video with different motion degrees.
Description
technical field [0001] The invention relates to a motion estimation method in video coding, in particular to a novel fast motion estimation method for video coding. Background technique [0002] At present, the development trend of video applications is becoming more and more obvious in the following directions: 1. High definition, the application format of digital video is fully upgraded from 720P to 1080P; 2. High frame rate, the frame rate of digital video is changed from 30fps to 60fps, 120fps 3. High compression rate, using limited bandwidth to obtain the best video experience. However, the current mainstream video coding standard H.264 / AVC can no longer adapt to this rapid development trend due to its own limitations. On January 25, 2013, the JCT-VC (Joint Collaborative Team on Video Coding, HEVC (High Efficiency Video Coding, High Efficiency Video Coding), developed by the Joint Collaborative Video Coding Group, is a new generation of high-efficiency video coding st...
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IPC IPC(8): H04N7/26
Inventor 肖进胜刘国雄王维张新晨张亚琪江昊易本顺
Owner WUHAN UNIV