Encoding and decoding method for mapping indexes based on historical motion vectors

Abstract

The invention relates to an encoding / decoding method for mapping indexes based on historical motion vectors. Firstly, a candidate historical motion vector list larger than or equal to a preset numberof historical motion vectors is constructed, therefore, more potential historical motion vectors can be recorded, and the subsequent encoding / decoding efficiency is improved; a candidate historical motion vector list is obtained from the constructed candidate historical motion vector list; historical motion vectors meeting a preset number requirement are selected based on a certain selection rule;a mapping relationship for the selected historical motion vectors one by one is established according to a preset mapping rule; namely, a historical motion vector with a small encoding / decoding bit number is mapped into a smaller index; and thus, the index encoding / decoding range is not expanded, the index entropy encoding / decoding mode is not changed, the effectiveness of index entropy encoding / decoding is fully guaranteed, the bit number consumed by encoding / decoding the motion vector is reduced on the whole, and the efficiency of encoding / decoding the motion vector is further improved.

Description

Technical field: [0001] The invention relates to the technical field of data encoding and decoding, in particular to an encoding and decoding method for mapping indexes based on historical motion vectors. Background technique: [0002] In the new generation of mainstream cloud computing and information processing platforms, directly transmitting the pixel data of the screen image generated in the cloud to the client is a system architecture that requires the least bandwidth for data transmission and has high security. Any video or image captured directly from the screen image display unit of various devices, or the content displayed on the display screen as an information carrier is called a screen image. Screens are everywhere, and an ever-increasing variety of applications generate an intricacies and variety of screen content. Therefore, the ultra-high compression ratio and extremely high-quality data compression technology for screen images, that is, Screen Content Codin...

AI Technical Summary

Problems solved by technology

[0016] In the encoding / decoding scheme based on historical motion vectors given above, a preset number of historical motion vector lists is directly established, and the list is directly used to select the optimal predicted historical motion vector, which may miss many potential historical motions Vector, which will affect the subsequent encoding / decoding efficiency; moreover, only the motion vectors in the list are updated in the order of "first in, first out", without considering other information of the historical motion vector (such as the code unit where the historical motion vector is located) position information and size information), there is room for further optimization in encoding / decoding efficiency

Images