A coding method for improving intra-frame prediction performance

Abstract

The invention discloses an intraframe prediction performance improvement encoding method. According to the method, prediction sample values are generated by use of mixed four-tap interpolation filtering, including DCT-based interpolation filtering and Gauss interpolation filtering, and for different prediction unit blocks, types of used interpolation filters are determined according to a given threshold; angle prediction mode classification is performed, i.e., intraframe angle prediction modes are classified into three types for carrying out different encoding processing; and boundary prediction sample smooth filtering is performed, i.e., final encoding prediction signals are generated by filtering boundary column or boundary row samples of prediction blocks by use of pixel differences between reference samples. According to the invention, through combination of direction features of intraframe angle prediction and space correlation of the reference samples, the generation process of the prediction signals is optimized, the prediction precision is improved, and better encoding compression performance is obtained.

Description

technical field [0001] The present invention relates to a method in the technical field of video encoding, in particular to an intra-frame prediction performance improvement encoding method implemented on HEVC. Background technique [0002] With the rapid development of Internet technology, video information is widely used in digital TV, video conferencing, network communication and other occasions. It is predicted that video data will account for about 90% of the total network transmission in the future. Video carries a wealth of information. It has the advantages of intuition, efficiency, and accuracy. It has become the most important and effective way for human beings to obtain information. However, video has high redundancy and a large amount of information, which poses great challenges to network transmission and storage devices. Therefore, high-efficiency compression coding must be performed on video data, and then the compressed code stream is transmitted. [0003]...

AI Technical Summary

Problems solved by technology

Although these coding methods can improve the compression efficiency to a certain extent, they do not take into account the directional characteristics of intra-frame coding and the correlation between reference samples.

Images