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Fast inter-frame mode decision methods applied to transcoding from H.264 to HEVC

A technology of inter-frame mode and decision-making method, applied in the field of transcoding from H.264 to HEVC, which can solve the problems of large increase in BD-rate and insufficient consideration

Inactive Publication Date: 2016-03-23
TONGJI UNIV
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Problems solved by technology

Since the Skip mode has a high proportion in the optimal mode without CU division, this method does not fully consider the selection of Skip-related features, so the increase in BD-rate is relatively large

Method used

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  • Fast inter-frame mode decision methods applied to transcoding from H.264 to HEVC
  • Fast inter-frame mode decision methods applied to transcoding from H.264 to HEVC
  • Fast inter-frame mode decision methods applied to transcoding from H.264 to HEVC

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Embodiment 1

[0083] First, statistics are made on the prediction mode distribution of CUs with depths 0 and 1 in HEVC to judge the feasibility of mode decision optimization. Such as figure 1 As shown, through statistical analysis, when the QP is 22, for video sequences with relatively gentle motion, when the depth is 0, the proportion of the CU optimal mode is Skip mode is 25% to 45%, and when the depth is 1, the CU optimal mode is The proportion of Skip mode is 30% to 50%. But for video sequences with intense motion, the proportion of CU optimal mode is Skip mode is only about 20%. With the increase of the quantization parameter (QuantizationParameter, QP), the detail processing of video encoding also becomes rough, and the proportion of Skip mode determined to be the optimal mode is increasing. In the video with gentle motion when QP is 37, Skip The proportions of the patterns are above 70%. Therefore, when the CU depth is 0 and 1, first judge whether the CU is in Skip mode in advance...

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Abstract

Different fast inter-frame mode decision methods applied to transcoding from H.264 to HEVC are adopted for coding units (CUs) of different HEVC depths respectively according to H.264 code stream information and prediction mode information of different depths of the HEVC inter-frame CUs. For CUs of which the depths are 0 and 1, information obtained by decoding an H.264 code stream is processed with a classifier, and decision threshold values used for Skip mode judgement and CU division respectively are calculated. First, Skip mode judgement of a CU is carried out in advance according to the Skip mode judgement threshold value, and then whether the CU is required to be divided into sub-CUs or not is predicted. The methods combine the statistical characteristic of CU division and distribution and the H.264 code stream information, so as to judge a Skip mode in advance, and effectively predict whether CU division is required to be stopped or continued. Therefore, a quadtree can be pruned effectively and unnecessary coding branches are skipped. The methods can remarkably lower the calculation complexity of inter-frame coding during transcoding from H.264 to HEVC.

Description

technical field [0001] The present invention relates to the transcoding of video data, and specifically refers to a method for transcoding H.264 to HEVC based on a Fisher linear classifier, which is used for transcoding video data of the H.264 / AVC standard into video data of the HEVC standard. Background technique [0002] In 2013, two major international organizations, MPEG and ITU, officially released the HEVC next-generation digital video codec standard to adapt to the development of high-quality video applications. HEVC uses advanced technology to improve the relationship between code stream, coding quality, delay and algorithm complexity, effectively improving video coding efficiency. HEVC extends the size of macroblocks from H.264's 16×16 to 64×64, and adopts a quadtree structure image division method, which can obtain better compression efficiency than H.264 / AVC. At the same time, HEVC also adopts a more flexible coding structure to improve coding efficiency, but sin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/40H04N19/109
Inventor 张冬冬童杰
Owner TONGJI UNIV
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