Interframe rapid video transcoding method applied to from H. 264 to HEVC

A fast video transcoding technology, applied in the field of H.264 to HEVC transcoding, can solve problems such as loss, monotonous motion information, and accelerated BD-rate

Inactive Publication Date: 2017-06-23
TONGJI UNIV
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[0007] Document 2 (see Peixoto, E., Izquierdo, E., "A complexity-scalable transcoder from H.264/AVC to the new HEVC codec," Image Processing (ICIP), 2012 19th IEEEInternational Conference on, pp.737-740, Sept.30 2012-Oct.3 2012.) proposed a motion vector-based transcoding algorithm,...

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  • Interframe rapid video transcoding method applied to from H. 264 to HEVC
  • Interframe rapid video transcoding method applied to from H. 264 to HEVC
  • Interframe rapid video transcoding method applied to from H. 264 to HEVC

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[0047] According to the H.264 bitstream information and HEVC inter-coding information, for the inter-coding part of the H.264 to HEVC transcoder, a fast mode decision and motion estimation method is adopted. For a CU with a depth of 0 and 1 layer, combine the information obtained by H.264 code stream decoding and HEVC coding information to obtain 2N×2N advance decision threshold and asymmetric partition (Asymmetric Motion Partition, AMP) decision threshold, and then determine the PU search Happening. First, the 2N×2N mode decision is made on the CU according to the 2N×2N judgment threshold, and then it is predicted whether the PU is directly judged as the 2N×2N mode, and then it is judged whether it is necessary to search for the AMP mode according to the AMP judgment threshold. For a CU with a depth of 2, mapping is performed according to the bitstream information of H.264 to determine whether to enter the depth 3 for encoding. For the motion estimation part, H.264 decoding i...

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Abstract

The invention provides an interframe rapid video transcoding method applied to from H. 264 to HEVC. According to H. 264 code stream information and HEVC interframe coding information, for the interframe coding part in an H. 264 to the HEVC transcoder, a fast mode decision and motion estimation method is adopted. With regard to a CU with the depth of 0, 1 layers, combined with H. 264 code stream decoded information and HEVC coded information, a 2N * 2N in-advance determination threshold and an asymmetric motion partition (AMP) determination threshold are obtained, and then the search condition of its PU is determined. For the motion estimation part, the motion vector search range and the motion vector search precision are determined through the H. 264 decoding information. The motion vector search precision is divided into three parts of the integer pixel precision, the sub-pixel precision and the zero motion vector. The method can greatly reduce the computation complexity of interframe coding in the transcoding process from H. 264 to HEVC.

Description

Technical field [0001] The present invention relates to the transcoding of video data, and specifically refers to a H.264 to HEVC transcoding method based on statistical analysis, which is used for transcoding video data of the H.264 / AVC standard into video data of the HEVC standard. Background technique [0002] Two major international organizations, MPEG and ITU, officially 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 still uses the prediction plus transform hybrid coding framework of previous generations of coding standards. Unlike H.264, HEVC expands the size of the coding block. In H.264, the size of the coding block is from 4×4 to 16×16, while HEVC expands the block size to 4×4 to 128×128 to cope with high-re...

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Application Information

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IPC IPC(8): H04N19/40H04N19/52H04N19/176H04N19/109
CPCH04N19/109H04N19/176H04N19/40H04N19/52
Inventor 张冬冬童杰
Owner TONGJI UNIV
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