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Method for optimizing time domain rate-distortion in low-delay video coding

A rate-distortion optimization and video coding technology, applied in the field of video coding, can solve problems such as rate-distortion optimization without time-domain dependence

Active Publication Date: 2016-08-17
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

Moreover, the low-delay coding structure only gives a fixed hierarchical coding structure, and does not optimize the rate-distortion according to the dynamically changing time-domain dependence. It needs to be re-explored to be applicable to the new generation of standard HEVC, based on time-domain dependence in low-delay video coding rate-distortion optimization

Method used

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  • Method for optimizing time domain rate-distortion in low-delay video coding
  • Method for optimizing time domain rate-distortion in low-delay video coding
  • Method for optimizing time domain rate-distortion in low-delay video coding

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example 1

[0087] Such as figure 2 As shown, the current original frame is divided into non-overlapping 16x16 coding units, each coding unit performs motion estimation in the next original frame to obtain the best matching unit, and the difference is recorded as the motion compensation error D of the original frame OMCP . Get the D of each coding unit in turn OMCP , specifically as In the same way, the D of each coding unit in all frames of the entire sequence is obtained OMCP . At the same time, for the coding unit in the key frame, it is still necessary to find the best matching unit in the next three frames (rPOC is 2, 3, 4) in the next GOP, and obtain the motion compensation error of the original frame, such as

[0088] Such as image 3 As shown, at frame f i The solid line box represents the current coding unit U i , according to the above original frame domain motion estimation, the coding unit U with the strongest correlation with it is obtained i+1 , that is, subject t...

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Abstract

The invention belongs to the technical field of video coding, and particularly relates to a rate-distortion optimizing method based on time domain dependence in low-delay video coding. A circulating group of picture (GOP) structure is adopted, a GOP is formed by every four frames, the frames in the GOPs are allocated to different layers, and the frames in the same layer follow the similar reference frame and QP allocation rule. The time domain dependence of a hierarchical structure in the low-delay video coding is analyzed, a time domain propagation chain shown in picture 2 is established according to the time domain dependence in the low-delay coding, and then rate-distortion optimal modeling of time domain dependence is carried out. A propagation factor omega a and global lagrangian multiplier lambda g are got. Finally, according to the propagation factor omega a, time domain rate-distortion optimizing is achieved only by adjusting the global lagrangian multiplier lambda g.

Description

technical field [0001] The invention belongs to the technical field of video coding, in particular to a rate-distortion optimization method based on time-domain dependence in low-delay video coding. Background technique [0002] In order to comply with the trend of 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. Many new technologies are accepted by HEVC, including quadtree block partitioning, more intra modes, merge modes, and hierarchical coding structures. Among them, the hierarchical coding structure is a reference frame management method coordinated with coding quality adjustment, aiming at real-time coding and decoding, and reducing delay as much as possible. [0003] The rate-distortion optimization technology is committed to minimizing the encoding distortion under the target bit rate limitation. Under the traditional video enco...

Claims

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Application Information

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IPC IPC(8): H04N19/147
CPCH04N19/147
Inventor 朱策高艳博李帅彭强周益民段昶
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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