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Video transcode method from H264 to HEVC based on region feature analysis

A technology of video transcoding and regional features, applied in the field of video transcoding

Active Publication Date: 2014-01-01
ZHEJIANG UNIV
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Problems solved by technology

[0007] These methods have greatly reduced the computational complexity of the transcoding process, but the transcoding process from H.264 to HEVC needs to be further improved with less quality loss to achieve higher speed

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  • Video transcode method from H264 to HEVC based on region feature analysis
  • Video transcode method from H264 to HEVC based on region feature analysis
  • Video transcode method from H264 to HEVC based on region feature analysis

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Embodiment Construction

[0085] The video transcoding method from H.264 to HEVC based on region feature analysis of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0086] Such as figure 1 As shown, a video transcoding method from H.264 to HEVC based on regional feature analysis includes the following steps:

[0087] (1) input original H.264 video stream, and this video stream is decoded, in the decoding process, extract the macroblock coding bit number of current decoding frame, DCT block entropy coding coefficient and motion vector field;

[0088] As far as the decoding process itself is concerned, the existing technology can be used. Due to the calculation needs in the subsequent process, the present invention emphasizes the acquisition of three types of information, the number of macroblock coding bits, DCT block entropy coding coefficients and motion vector fields.

[0089] (2) Correspond the area covered by the HEVC coding tree unit to eac...

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Abstract

The invention discloses a video transcode method from H264 to HEVC based on region feature analysis. The method comprises the following steps that decoding is carried out on an original H.264 video stream, and macro block encoding bit numbers, macro block encoding modes and motion vector fields of a current decoding frame are extracted; areas covered by HEVC encoding tree units are made to correspond to macro blocks of the current decoding frame, encoding complexity of each area is calculated, and the searching depth range of each HEVC encoding tree unit is determined; motion estimation is carried out on each encoding tree unit level by level according to corresponding searching depth range, and if the mode of a predicted unit is an Inter mode, region feature analysis is carried out, and a division mode is obtained; motion search is carried out on each predicted unit according to various reserved division modes, and the division mode with the smallest rate-distortion and motion vectors are selected to carry out HEVC recoding. According to the method, on the premise that almost the same rate-distortion is kept, transcoding speed is greatly improved.

Description

technical field [0001] The present invention relates to the field of video transcoding, in particular to a video transcoding method from H264 to HEVC based on regional feature analysis. Background technique [0002] With the diversification of different network types, receiving terminals and content expressions, the interaction between different systems and networks has become more and more important. There are huge differences in power consumption requirements and other aspects. In addition, different types of network characteristics are different, users have different transmission bandwidths, and the requirements for time and space resolution of videos are also different. As a result, the same video source requires Simultaneously or synergistically broadcast in radio and television networks, telecommunication networks and communication networks, and seamlessly switch between different network devices. The above requirements force the video code stream to be dynamically ad...

Claims

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Application Information

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IPC IPC(8): H04N7/01H04N19/40H04N19/169
Inventor 陈耀武蒋炜田翔周凡
Owner ZHEJIANG UNIV
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