ADAPTIVE DOWNSAMPLING FOR HIGH-DEFINITION VIDEO CODING

被引:0
|
作者
Dong, Jie [1 ]
Ye, Yan [1 ]
机构
[1] InterDigital Commun, San Diego, CA USA
关键词
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中图分类号
TB8 [摄影技术];
学科分类号
0804 ;
摘要
Previous research has shown that downsampling prior to encoding and upsampling after decoding can improve the rate-distortion (R-D) performance compared with directly coding the original video using standard coding technologies, e.g., JPEG and H.264/AVC, especially at low bit rates. This paper proposes a practical algorithm to find the optimal downsampling ratio that balances the distortions caused by downsampling and coding, thus achieving the overall optimal R-D performance. Given the optimal sampling ratio, dedicated filters for down-and up-sampling are also designed. Simulations show this algorithm improves the R-D performance over a wide range of bit rates, e.g., from 1.0 dB at high bit rates to 2.5 dB at low bit rates.
引用
收藏
页码:2925 / 2928
页数:4
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