Encoding and decoding methods and devices for multiple image block division ways

Abstract

The embodiment of the invention provides an encoding method for multiple image block division ways, comprising the following steps of: determining the division way and the division direction of an image block; dividing the image block according to the division way and the division direction to obtain image subblocks sequentially arranged along the horizontal direction or the vertical direction; determining whether the image subblocks are needed to be further divided, and if not, predicating an intra-frame coding object according to the image subblocks to obtain residual data; transforming, quantifying and entropy-decoding the residual data to obtain encoded residual data; and writing the image block division way, the image block division direction, an identifier for indicating whether the image subblocks are needed to be divided and the encoded residual data into a code stream. By using the encoding and decoding methods provided by the embodiment of the invention, better prediction accuracy can be obtained when the pixel value of the image block in the horizontal direction or the vertical direction changes less.

Description

technical field [0001] The invention relates to video codec technology, in particular to a codec method and device for multi-image block division. Background technique [0002] The basic principle of video coding and compression is to use the correlation between space domain, time domain and code words to remove redundancy as much as possible. The current popular approach is to use a block-based hybrid video coding framework to achieve video coding and compression through steps such as prediction, transformation, quantization, and entropy coding. This coding framework has shown a strong vitality, from the earliest MPEG-1 to the latest video coding standard H.264 / AVC, and even the next generation of video coding that is being developed by the JCTVC working group (a joint working group established by MPEG and VECG). The video coding compression standard HEVC still uses this block-based hybrid video coding framework. [0003] Block-based spatial domain predictive coding techn...

AI Technical Summary

Problems solved by technology

[0004] Obviously, the image block division and prediction method in the prior art only divides the image block into four square sub-image blocks, and the sub-image blocks are also individually stored according to the adjacent blocks of the current image block. Block prediction, lack of flexibility, it is difficult to guarantee the accuracy of prediction and the effect of codec

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