Method for layering time domain rate-distortion optimization in random access video coding

Abstract

The invention belongs to the technical field of video coding, and particularly relates to a method for layering time domain rate-distortion optimization in random access video coding. A cyclic group of picture (GOP) structure is adopted, every eight frames form one GOP and are distributed to different layers, frames on the same layer abide by similar reference frame and QP distribution rules, as shown in figure 1, the coding sequence of frames is represented by EOC, and the playing sequence / time sequence of frames is represented by POC. Time domain dependency on the same layer and different layers among coding units in random access coding is analyzed, nested layering time domain propagation chains are established according to time domain dependency in random access coding, as shown in figure 3, and then layering time domain dependency rate-distortion optimal modeling is conducted and propagation factor kv and global lagrangian multiplier lambda g are obtained. Finally, according to the propagation factor kv, time domain rate-distortion optimization is achieved by adjusting the global lagrangian multiplier lambda g.

Description

technical field [0001] The invention belongs to the technical field of video coding, and in particular relates to a hierarchical time-domain rate-distortion optimization method in random access video coding. Background technique [0002] In order to cope with high-definition video, a new generation of video coding standard HEVC was formulated in early 2013, which has nearly doubled the performance of the previous generation standard H.264 / AVC. In video codecs, rate-distortion optimization technology is an important part of significantly improving coding efficiency. Traditionally, each coding unit is optimized independently. However, due to the widespread use of intra-frame and inter-frame prediction, there is a dependency between each coding unit. Specifically, the current coding unit U x The quality of the coding will affect the next coding unit U in the space or time domain x+1 , so joint optimization is considered, defined as global rate-distortion optimization. At pre...

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Problems solved by technology

At present, many documents explore global rate-distortion optimization, such as the document "E.H.Yang and X.Yu, "Rate Distortion Optimization for H.264Interframe Coding: A General Framework and Algorithms", IEEE Trans.Image Processing, vol.16, no. 7, pp.1774-1784, July.2007", this document uses a dynamic programming method, which is complex and cannot be realized in real time, but this method proves from the side that joint optimization can improve coding performance

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