同济大学电子与信息工程学院 ??上海 ??201804
基金项目:国家自然科学基金(61601200, 61871289)，上海市自然科学基金(18ZR1440600)
详细信息
作者简介:王淑慧：女，1973年生，副研究员，研究方向为视频编码算法及SOC实现
通讯作者:王淑慧 shw@tongji.edu.cn
中图分类号:TN919.8计量
文章访问数:783
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被引次数:0
出版历程
收稿日期:2018-02-06
修回日期:2018-09-14
网络出版日期:2018-09-18
刊出日期:2018-12-01
Design and Implementation for Chroma Extensions Video Coding Based on AVS2 Platform
Shuhui WANG,College of Electronics and Information Engineering, Tongji University, Shanghai 201804, China
Funds:The National Natural Science Foundation of China (61601200, 61871289), Shanghai Natural Science Foundation (18ZR1440600)
摘要
摘要:色度扩展视频编码是当前视频编码领域的一个热点研究课题。该文提出基于AVS2平台的色度扩展视频帧内编码的实现方案。仿444/422编码方案通过将输入图像中的色度分量下采样后，使用原有的420方式进行编码，以实现444/422编码。进一步，该文将帧内预测及环路滤波等编码模块无缝扩展到相应的444/422格式，实现444/422帧内预测编码。实验结果表明，对444格式和422格式序列，在高码率的情况下444/422帧内预测编码与仿444/422编码相比，U/V平均BD-rate的减少分别为31.44%/31.72%和18.85%/19.3%，而Y分量平均BD-rate的增加仅为0.5%。其中422色度帧内预测过程的算法优化减少Y/U/V BD-rate最高可达5.66%。与HEVC RExt编码相比，在低码率时，444/422帧内预测编码取得了更好或相近的编码性能。
关键词:色度扩展视频编码/
色度子采样/
AVS2/
帧内预测
Abstract:Chroma extensions video coding is a hot topic in the field of video coding. Chroma extensions video coding scheme based on AVS2 platform is proposed. The most direct solution is pseudo444/422 coding. In this method, chroma component in the input image is down sampled by averaging adjacent samples. The core coding modules are still 420 coding. Further, this paper seamlessly extends intra prediction and loop filter to the 444/422 chroma format to implement 444/422 intra prediction coding. The experimental results show that compared with pseudo444/422 coding, in the case of high bit rate, the average U/V BD-rate saving is 31.44%/31.72% and 18.85%/19.30% for 444 and 422 test sequences respectively, with negligible increase of Y BD-rate (0.5% on average). The modification of the 422 chroma intra prediction algorithm achieves up to 5.66% Y/U/V BD-rate reduction. 444/422 intra prediction coding provides similar or better coding performance than HEVC RExt coding at low bitrates.
Key words:Chroma extensions video coding/
Chroma subsampling/
AVS2/
Intra prediction
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