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1. (WO2014205730) AVS VIDEO COMPRESSING AND CODING METHOD, AND CODER

Pub. No.:    WO/2014/205730    International Application No.:    PCT/CN2013/078148
Publication Date: Thu Jan 01 00:59:59 CET 2015 International Filing Date: Fri Jun 28 01:59:59 CEST 2013
IPC: H04N 19/00
Applicants: PEKING UNIVERSITY SHENZHEN GRADUATE SCHOOL
北京大学深圳研究生院
Inventors: WANG, Zhenyu
王振宇
WANG, Ronggang
王荣刚
GAO, Wen
高文
WANG, Wenmin
王文敏
DONG, Shengfu
董胜富
LI, Ying
李英
Title: AVS VIDEO COMPRESSING AND CODING METHOD, AND CODER
Abstract:
Disclosed are an AVS video compressing and coding method, and a coder. An initial weight and quantization coefficient of each frequency band in a quantization matrix is adjusted by mainly using a calculated average brightness value of an image to be coded and an average transform coefficient of each frequency band, so as to obtain a quantized final weight and quantization coefficient; and transform coefficients of different frequency points obtained by means of transforms are quantized in different steps by using the quantization matrix formed by the quantized final weight and quantization coefficients. In this way, attributes of an image to be coded are fully considered in a quantization process, and the weight and quantization coefficients in the quantization matrix is adaptively adjusted, thereby effectively reducing the coding rate while the video coding quality is ensured.