Video encoding method and decoding method as well as encoding and decoding device

Abstract

The invention relates to a video encoding method and decoding method as well as an encoding and decoding device. The encoding method comprises the following steps of: generating a double predicting mark symbol for an encoding block; generating the double predicting mark symbol for at least one sub-block of the encoding block when the encoding block needs to carry out double prediction, wherein the double predicting mark symbol of the sub-block is used for indicating whether the sub-block carries out the double prediction or not; predicting according to the double predicting mark symbol of theencoding block and the double predicting mark symbol of at least one sub-block of the encoding block to acquire a predicting image; and acquiring a predicting residual error according to the predicting image and encoding the predicting residual error. A unit which is subjected to the double prediction and marked by the double predicting mark symbol is thinned to be a sub-block grade so as to improve the encoding efficiency.

Description

technical field [0001] The present invention relates to the technical field of video coding and decoding, in particular to a video coding method, a decoding method, and a coding and decoding device. Background technique [0002] There are a lot of redundant information in the video signal, which can be divided into spatial redundant information, temporal redundant information, data redundant information and visual redundant information. [0003] Video compression technology is generally based on a block-based traditional hybrid coding (Hybrid Coding) framework that integrates predictive coding, transform coding, and entropy coding. [0004] The predictive coding in the traditional video hybrid coding framework divides the coded frame into coding units, performs predictive coding on the coding units, obtains the predicted value, and obtains the difference between the predicted value and the value to be coded, which is the residual data, and binary data on the residual data O...

AI Technical Summary

Problems solved by technology

[0007] In the process of realizing the present invention, the inventors found that the prior art has at least the following defects: the action unit of double prediction is a macroblock, that is, for a macroblock, all its sub-blocks either use double prediction or do not use double prediction Double prediction, the flexibility of double prediction is poor, and the encoding and decoding efficiency is not high

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