Error tolerance method, device and chip for AVS video decoder

Abstract

The invention provides a fault-tolerant method of an AVS video decoder, which comprises the following steps: the boundary fill of a margin pixel value is performed around a reference frame which is decoded to obtain the reference frame with boundaries and available boundaries upwards and downwards as well as leftwards and rightwards, wherein, only the image contents within the available boundariesare used for video image display; the number of lines which are filled upwards and downwards as well as leftwards and rightwards is determined by the range achieved by motion vectors; the motion vectors, which are processed through AVS decoding corresponding to a macro block to be decoded in a current frame, are acquired; a matching reference macro block is found from the reference frame accordingto the motion vectors; and the reference macro block and a residual-error macro block which is obtained after the macro block to be decoded in a current frame is decoded are toted up, so as to obtain a restructuring macro block of the macro block to be decoded. In the fault-tolerant method, the boundary fill needs to be performed around the reference frame only, the fault-tolerant method can also be found out from the reference frame under the circumstances that the motion vectors go awry, the current frame is restructured, the operation amount of the video decoder is reduced, the memory reso urces are saved, and the decoding efficiency is improved.

Description

technical field [0001] The invention relates to the field of video communication, in particular to an error-tolerant method, device and chip of an AVS video decoder. Background technique [0002] With the development of network applications, video communication via the network has been widely used in instant messaging, chat rooms, mobile TV, etc. In video communication, the image frames in the video are usually encoded as I frames, P frames and B frames For transmission, the I frame is an intra-frame coded frame, which is independently decoded without relying on other frames, and the code is relatively large; the P frame and B frame are inter-frame coded, which depend on its previous I frame or P frame and each macro Only the motion vector information of the block can be decoded, because the P frame and B frame refer to the previous frame and the next frame, eliminating image redundancy, so the code stream is small. The encoded code stream of the video image is sent to the ...

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Problems solved by technology

[0006] However, the disadvantage of using this error-tolerant method is that it is necessary to judge the position of the reference macroblock of each macroblock to be decoded, and when the judgment exceeds a reasonable range, it is necessary to add error tolerance to the code of each macroblock to be decoded code to ensure that it is within a reasonable range of the reference frame, so that a large amount of error-tolerant code will need to be added to the code, which seriously consumes storage resources; at the same time, since each time a macroblock to be decoded is decoded, it is necessary to judge Whether its reference macroblock exceeds the upper, lower, left and right boundaries of the above-mentioned reference frame, that is to say, for each reference macroblock of a macroblock to be decoded, four judgments of up, down, left and right must be carried out, which greatly increases the video decoder. The amount of calculation, thereby reducing the decoding efficiency

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