Method and apparatus for video encoding and decoding

Abstract

The invention provides a method and apparatus for video encoding and decoding. At the coding end, selection of intra-frame prediction mode of the current coding block can be performed in accordance with adjacent blocks, and encoding operation of the current encoding block can be performed by selection of the intra-frame selection mode, wherein, when the limited DC prediction mode is selected as the intra-frame prediction mode, if the current encoding block is in the same macroblock with each adjacent encoding block, the adjacent blocks are available, otherwise, all the adjacent blocks are unavailable; or, if at least one of the encoded adjacent blocks is the intra-frame prediction block, all the adjacent blocks are unavailable; or, all the adjacent blocks are unavailable. Upon parsing andobtaining the intra-frame prediction mode adopted by the current decoding block at the decoding end, decoding operation can be performed according to the intra-frame prediction mode adopted by the current decoding block which is obtained by parsing. By adopting a limited DC prediction mode, the embodiment of the invention is not only capable of ensuring error recovery performance, but also capable of enhancing encoding efficiency of the intra-frame updating macroblock, as well as improving performance of encoding and decoding.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a video codec technology. Background technique [0002] In the video communication system, video data error or packet loss is usually unavoidable. Therefore, it is necessary to adopt corresponding measures to improve the anti-error ability of video data, so that the video information can recover from the error as soon as possible, and provide users with Provide a better subjective experience. [0003] At present, an anti-error code implementation solution provided is an intra-frame refresh method, through corresponding intra-frame refresh, corresponding error recovery can be realized to a certain extent. Such as figure 1 As shown, the P frame is encoded using the inter-frame mode, and the corresponding IR frame is a refresh frame, and part or all of the macroblocks in the IR frame are encoded using the intra-frame coding mode, that is, the intra-frame coding in t...

AI Technical Summary

Problems solved by technology

[0006] In the above-mentioned intra-frame refresh method, if the adjacent macroblock of a certain refreshed macroblock is an inter-predicted macroblock (i.e. P macroblock), since the P macroblock may refer to the previous P frame, the P macroblock will be It is possible to accumulate the corresponding transmission error from the previous reference P frame, and will pass the error to the refresh macroblock (i.e. the I macroblock in the IR frame), so that the refresh macroblock may also be affected by the transmission error, and then Reduced error resilience of the intra refresh method

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