AVS fast mode selection algorithm based on adaptive threshold

A technology of adaptive threshold and mode selection, applied in the field of video coding, to achieve the effect of small correlation and improved coding speed

Inactive Publication Date: 2013-11-06
张新安
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Problems solved by technology

[0007] Aiming at the need for a more efficient fast mode selection algorithm for my country's video coding standard AVS, in order to solve th

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  • AVS fast mode selection algorithm based on adaptive threshold
  • AVS fast mode selection algorithm based on adaptive threshold
  • AVS fast mode selection algorithm based on adaptive threshold

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Embodiment Construction

[0045] The AVS fast mode selection algorithm flow based on the adaptive threshold of the present invention is as attached figure 1 As shown, the P-frame macroblock coding in the fast mode selection algorithm includes the following steps:

[0046] Step 1. Calculate SKIP mode RDCost cost;

[0047] Step 2. Calculate the 16×16 pattern RDCost In the motion vector search process, the first reference frame is searched first to obtain the optimal matching block SAD value, if the value is less than the threshold T 16×16 Then end the search, otherwise, continue to search the second reference frame, find the optimal motion vector, and calculate the corresponding optimal motion vector RDCost cost;

[0048] Step 3. Take SKIP mode and 16×16 mode RDCost cost min_ rd cost , with an adaptive threshold TH_irdcost with TH_mrdcost Compare if min_ rd cost > TH_irdcost and min_ rd cost TH_mrdcost , jump directly to step 6, otherwise go to step 4;

[0049] Step 4. Calculate th...

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Abstract

The invention provides an AVS fast mode selection algorithm based on an adaptive threshold. An early termination criterion is adopted by the algorithm, meanwhile the adaptive threshold is applied in a motion search and mode selection process, and a new fast mode selection criterion is proposed based on the characteristic that correlation among P frames is small in video sequences with B frame codes added. When the optimal block price of a first reference frame is smaller than a threshold, searching is terminated, and otherwise searching is continued to be carried out on a second reference frame. A P frame macro block encryption algorithm flow is shown as an attached figure, steps of a B frame macro block encryption algorithm resembles those of the P frames, yet the judging criterion and the rules of adaptive updating of thresholds in each step are different. Compared with a full search algorithm in AVS standard reference software RM52j, the AVS fast mode selection algorithm based on the adaptive threshold saves calculated amount by 36.9% to 78.6% under the conditions that image quality is ensured and the code rate is barely changed, and coding speed can be improved effectively.

Description

technical field [0001] The invention relates to the technical field of video coding in signal processing, in particular to an AVS fast mode selection algorithm based on an adaptive threshold. Background technique [0002] The digital audio and video industry is one of the three major components of the information industry. my country's digital audio and video industry has a huge scale, but its intellectual property rights are weak. This field has long been monopolized by foreign technical standards such as MPEG-2, MPEG-4 and H.264. The adoption of these standards requires the payment of high patent fees. In order to reduce the patent fee burden of the domestic audio and video industry and enhance the core competitiveness of domestic enterprises, the Ministry of Information Industry approved the establishment of the "Digital Audio and Video Coding Technology Standard Working Group" in June 2002 to engage in the research and development of digital audio and video coding technol...

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Application Information

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IPC IPC(8): H04N7/26H04N7/32
Inventor 张新安
Owner 张新安
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