Video encoding/decoding method

Abstract

A video coding / decoding method based on MPEG-4 standard. In a coefficient prediction algorithm, the coefficient of first row of macro blocks of a image is stored in the memory to predict the second row of macro blocks; and then the data in the memory are updated as the coefficient of the first row of macro blocks, to further predict the third row of macro blocks, until decoding the whole image. In a variable length coding / decoding algorithm, the code words are classified based on the front digital of the code word in the VLC code list, the VLC code list is divided into at least two. In the image stuffing algorithm, the size of the square stuffing region at the four corners of the original image are 16*16 pixels. Each frame of the decoded video files is I-frame or P frame. By amelioration in coefficient forecast, variable length coding and decoding, image stuffing and the like algorithms, the video decoding in the method occupies very small memory, thereby reducing production costs andpower consumption of mp4 products.

Description

technical field [0001] The present invention relates to the field of video coding and decoding. Background technique [0002] MPEG-4 is a relatively popular dynamic image compression coding standard. Using this compression standard, high-quality images can be transmitted in a very narrow bandwidth. At the same time, since the MPEG-4 standard introduces the concept of video objects, encoding is based on objects, so it is interactive. These characteristics have played a role in promoting the application of multimedia. [0003] Most of today's embedded multimedia mp4 playback devices are based on MPEG-4 and its derivatives. When decoding a video file, the CPU of the decoding chip needs to perform a large number of complex operations, which requires a very large memory capacity. Existing multimedia mp4 playback devices generally have a memory capacity of several megabytes. Large memory capacity increases cost overhead, and memory needs to be dynamically refreshed, which is a...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the existing multimedia mp4 playback equipment requires a very large memory capacity, the applicant of the present invention has carried out improvement research, proposed a video encoding and decoding method, and optimized the encoding and decoding algorithm of MPEG-4, thereby greatly reducing Memory usage and device power consumption

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