Method and apparatus for encoding and decoding based on intra prediction

Abstract

Provided are a method and apparatus for encoding and decoding based on intra prediction. In the method, information regarding a direction of intra prediction of a current block is encoded into one of a plurality of values, depending on whether the directions of intra prediction of neighboring blocks that have been encoded before encoding the current block are identical to one another and whether the direction of intra prediction of the current block is identical to those of the neighboring blocks. Accordingly, it is possible to increase the compression rate of intra prediction encoding with a higher probability.

Description

technical field [0001] The present invention relates to an encoding and decoding method and device based on intra-frame prediction, and more specifically, to such a method and device that use adjacent blocks to improve the probability of predicting the direction of intra-frame prediction , to encode the intra-frame prediction direction of the current block to be encoded, so as to improve the encoding compression rate. Background technique [0002] In video compression methods such as MPEG-1, MPGE-2, and MPEG-4 H.264 / MPEG-4 Advanced Video Coding (AVC), a picture is divided into macroblocks in order to encode the picture. Next, each macroblock is encoded using inter prediction and intra prediction. Then, an optimum encoding mode is selected in consideration of the data size of the encoded macroblock and the degree of degradation of the original macroblock, and the macroblock is encoded in the optimum encoding mode. [0003] In intra prediction, a current block of a current p...

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Problems solved by technology

That is, although the current block 30 uses the same prediction mode as one of the neighboring blocks, information about the prediction direction is not compressed

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