一种多色度格式级联编码的AVS2全色度图像编码算法  

A multi-chroma format cascaded coding method for full-chroma image in AVS2

作　　者：赵利平[1] 林涛[2] 周开伦[2] 胡珂立[1] 林春梅[1] ZHAO Liping;LIN Tao;ZHOU Kailun;HU Keli;LIN Chunmei(Department of Computer Science and Engineering, Shaoxing University, Shaoxing 312000, China;Institute ofVLSI, Tongji University, Shanghai 200092, China)

机构地区：[1]绍兴文理学院计算机科学与工程系,浙江绍兴312000 [2]同济大学超大规模集成电路研究所,上海200092

出　　处：《电信科学》2018年第4期57-67,共11页Telecommunications Science

基　　金：国家自然科学基金资助项目(No.61601200;No.61603258)~~

摘　　要：在我国最新的第二代数字音视频编解码算法标准(AVS2)的基础上,提出了一种多色度格式级联编码(MCFCC)的全色度(4:4:4采样格式)图像编码算法。MCFCC算法首先对4:4:4采样格式的图像进行色度下采样转换成4:2:0采样格式的图像,然后进行4:2:0采样格式的帧内预测、变换、量化、反量化、反变换、熵编码和在率—失真最优化过程中使用带权重的4:4:4采样格式的失真计算方案,最后将其上采样为4:4:4采样格式的预测补偿图像并采用4:4:4采样格式的环内滤波补偿算法。实验结果表明:对于全色度自然图像,MCFCC算法在低编码复杂度和低实现成本(完全复用4:2:0编解码模块)的前提下,综合编码效率进一步提高。In the second generation of audio video coding standard（AVS2）, a multi-chroma format cascaded coding method（MCFCC） for full-chroma（4：4：4 sampling format） images coding was proposed. The MCFCC algorithm firstly converts the 4：4：4 sampling format image into 4：2：0 sampling format image, then the 4：2：0 sampling format image was processed by 4：2：0 sampling format intra prediction, transform, quantization, inverse quantization, inverse transform, entropy coding and a weighted 4：4：4 sampling format distortion calculation method in the rate-distortion optimization process, finally 4：4：4 sampling format in-loop filtering and offset algorithms were applied to the 4：4：4 sampling format image after up sampling. The experimental results show that, for full-chroma natural images, the MCFCC algorithm achieves higher coding efficiency at very low additional encoding complexity and very low additional design and implementation cost.

关 键 词：图像编码 AVS2 全色度 色度重采样 环内滤波 

分 类 号：TP919.81[自动化与计算机技术]