Quick size reduction transcoding method based on region of interest

Abstract

The invention discloses a quick size reduction transcoding method based on a region of interest, and belongs to the technical field of digital video transcoding of computers. The quick size reduction transcoding method comprises the following steps of: (1) acquiring encoded information from an input H.264 encoded code stream, wherein the encoded information comprises an inter-frame encoding mode, a motion vector and a discrete cosine conversion coefficient; and performing size reduction on a video of a pixel from a common intermediate format (CIF) into a quarter common intermediate format (QCIF), namely 176 pixels *144 pixels; (2) dividing a motion region and a background region by use of motion edge detection according to an image texture characteristic; and (3) adopting corresponding inter-frame modes for macroblocks positioned in different regions according to the motion characteristics of the marcoblocks, performing motion vector reconstruction on the macroblocks positioned in the motion region according to motion differences of the macroblocks by respectively selecting an adaptive motion vector down-sampling method or a most severe weighing method, performing the motion vector reconstruction on the macroblocks positioned in the background region by adopting an average weighing method, and performing motion search on the macroblocks positioned on the edge of and in a motion target. By utilizing the quick size reduction transcoding method, the quality of a transcoded video can be guaranteed, and the instantaneity of size reduction transcoding is realized.

Description

technical field [0001] The invention belongs to the technical field of computer digital video transcoding, and in particular relates to a method for downsizing and transcoding a video of the H.264 encoding standard based on an area of ​​interest. 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, the performance of terminal equipment, such as differences in display resolution, processing power, and storage capacity, and video coding standards, such as MPEG2, MPEG4, H.264, etc. The difference makes it very important to improve the compatibility of video streams in different appl...

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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 inconsistent motion of macroblocks, and propose a region-of-interest-based video with higher transcoding for different motion degrees Quality fast downsizing transcoding method

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