H.264 downsizing transcoding method based on texture and motion characteristics

A motion feature and transcoding technology, applied in TV, electrical components, digital video signal modification, etc., can solve problems such as inaccurate motion prediction and inconsistency of macroblock motion

Inactive Publication Date: 2009-12-09
BEIJING UNIV OF TECH
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Problems solved by technology

[0004] The purpose of the present invention is to make full use of the coding information in the input coding code stream, solve the problem of inaccurate motion prediction caused by the inconsi

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  • H.264 downsizing transcoding method based on texture and motion characteristics
  • H.264 downsizing transcoding method based on texture and motion characteristics
  • H.264 downsizing transcoding method based on texture and motion characteristics

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Embodiment Construction

[0044] The present invention provides a H.264 downsizing transcoding method based on texture and motion features, and the detailed steps of its specific embodiment are as follows:

[0045]The test model jm12.2 of H.264 / AVC is adopted, and the experimental platform adopts Visual C++6.0. Firstly, the standard test sequence in CIF format (352×288) is reduced to QCIF format (176×144); secondly, the CIF format video is encoded and decoded on JM12.2, and the encoding information is read and written in the decoding process In the external file of TXT format, obtain coding information by reading the external file when the video after reducing the size is encoded; Then call the method mentioned in the present invention to complete the specific coding work to the reduced-size video. The first 50 frames of each sequence are selected for transcoding, and the coding method adopts intra-frame coding (intra-frame, I frame) for the first frame, and inter-frame coding (inter-frame, P frame) fo...

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Abstract

The invention provides an H.264 downsizing transcoding method based on texture and motion characteristics, and belongs to the technical field of computer digital video transcoding. The invention specifically comprises the following steps: (1) acquiring the coding information input into the H.264 code stream; wherein, the coding information includes an inter-frame coding mode, motion vectors and discrete cosine transformation coefficients; (2) dividing the motion area and the background area according to the image texture characteristics by means of the motion edge detection; (3) adopting the corresponding inter-frame mode according to the motion characteristics of the macro-blocks located in different areas, particularly, reconstructing the motion vectors by the adaptive motion vector re-sampling method or the align-to-worst weighting method according to the motion difference of the macro-blocks located in the motion area, reconstructing the motion vectors of the macro-blocks located in the background area by the align-to-average weighting method, and carrying out the motion search of the macro-blocks located on the edge of the motion object and the internal macro-blocks. Compared with other methods, the method of the invention can not only guarantee the quality of the transcoded video, but also effectively solve the problem of the downsizing transcoding real-time performance.

Description

technical field [0001] The invention belongs to the technical field of computer digital video transcoding, and in particular relates to a method for downscaling and transcoding a video of the H.264 encoding standard based on texture and motion features. Background technique [0002] With the development of video coding technology and network technology, network-based multimedia communication, such as video conferencing, Internet video-on-demand, digital TV, etc., have been widely used in society and people's daily life. The service of clear digital video is favored by people. Due to the diversity of network types (such as Internet networks, telecommunication networks and cellular wireless networks, etc.), the differences in terminal equipment performance (such as display resolution, processing power and storage capabilities, etc.) and video coding standards (MPEG2, MPEG4, H.264 etc.), it is very important to improve the compatibility of video streams between different appli...

Claims

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Application Information

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IPC IPC(8): H04N7/26H04N7/50H04N19/61H04N19/625
Inventor 贾克斌吕卓逸刘鹏宇
Owner BEIJING UNIV OF TECH
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