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A Fast Inter Mode Decision Method Applied to H.264 to HEVC Transcoding

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

Inactive Publication Date: 2018-06-05
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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  • A Fast Inter Mode Decision Method Applied to H.264 to HEVC Transcoding
  • A Fast Inter Mode Decision Method Applied to H.264 to HEVC Transcoding
  • A Fast Inter Mode Decision Method Applied to H.264 to HEVC Transcoding

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Embodiment 1

[0083] First, statistics are made on the distribution of prediction modes of CUs with depths of 0 and 1 in HEVC to determine the feasibility of optimizing the mode decision. Such as figure 1 As shown, through statistical analysis, when the QP is 22, for a video sequence with relatively smooth motion, the ratio of the CU optimal mode to Skip mode when the depth is 0 is 25%-45%, and the CU optimal mode is when the depth is 1 The proportion of Skip mode is 30% to 50%. For video sequences with violent motion, the proportion of the Skip mode as the CU optimal mode is only about 20%. As the quantization parameter (QP) increases, the detail processing of video encoding becomes rougher. The proportion of Skip mode determined to be the optimal mode continues to increase. In a video with smooth motion when QP is 37, The proportion of Skip mode is above 70%. Therefore, when the CU depth is 0 and 1, first determine whether the CU is in Skip mode in advance, and then predict the continue...

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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, in particular to a H.264 to HEVC transcoding method based on Fisher linear classifier, which is used for transcoding H.264 / AVC standard video data into HEVC standard video data. Background technique [0002] Two major international organizations, MPEG and ITU, formally released the HEVC new generation digital video codec standard in 2013 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 expands the size of macroblocks from H.264's 16×16 to 64×64, and adopts a quad-tree structure of image division, which can achieve better compression efficiency than H.264 / AVC. At the same time, HEVC also uses a more flexible coding structure to improve coding efficiency. However, due to the need for coding unit (CU), pre...

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Application Information

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