Decision-making method and device for intra-frame prediction mode of high efficiency video coding

Abstract

The invention discloses a decision-making method and a decision-making method device for intra-frame prediction modes of high efficiency video coding. The decision-making method comprises the steps of: dividing directivity prediction modes of a current PU block into M direction mode groups according to corresponding serial number of the modes, and adopting a dichotomy to find out an optimal intra-frame prediction mode based on Hadamard transform at minimal rate distortion cost in each direction mode group; carrying out rough mode decision based on Hadamard transform on a mode 0, a mode 1, one or more most-likely prediction modes and the optimal intra-frame prediction mode in each direction mode group, and selecting the N intra-frame prediction modes based on Hadamard transform at minimal rate distortion cost to be added into a screening list; and carrying out rate distortion optimization calculation on the intra-frame prediction modes contained in the screening list, and selecting one of the optimal intra-frame prediction modes for predicting the current PU block. Compared with the prior art, the decision-making method and the decision-making method device can increase the intra-frame prediction encoding speed by 20% without changing video compression quality.

Description

technical field [0001] The present application relates to the field of video coding, and in particular to a method and device for determining an intra prediction mode of High Efficiency Video Coding (HEVC). Background technique [0002] In recent years, with the development of the Internet and hardware devices, the cost of video production has become lower and lower, and the demand for video sharing and access has been increasing. The resolution of video is getting bigger and bigger, high-definition video (resolution is 1920×1080, denoted as 1080p) and even ultra-high-definition video (resolution is 3840×2160, denoted as 4K) is being produced, disseminated and played more and more . However, neither MPEG-2 (Moving Picture Experts Group 2, Moving Picture Experts Group Series Standard 2) nor H.264 / AVC (Advanced Video Coding, Advanced Video Coding) are designed for this high-resolution video, This puts forward new requirements and challenges for video compression technology. ...

AI Technical Summary

Problems solved by technology

[0007] There are 35 intra-frame prediction modes in HEVC. If a Rate Distortion Optimization (RDO) operation is performed for each intra-frame prediction mode, that is, a prediction and transformation is performed for each intra-frame prediction mode. , quantization, entropy coding, inverse quantization, inverse transformation and distortion processing, will increase the computational complexity of the encoder geometrically

Images