標題: A Parametric Window Design for OBMC with Variable Block Size Motion Estimates
作者: Chen, Yi-Wen
Wang, Tse-Wei
Tseng, Yu-Cheng
Peng, Wen-Hsiao
Lee, Suh-Yin
資訊工程學系
Department of Computer Science
公開日期: 2009
摘要: This paper addresses the problem of adapting overlapped block motion compensation (OBMC) windows for use with variable blocksize motion estimates. We tackle the problem by using a parametric window design, which expresses, based on a statistical motion model, the optimal weights as a function of the distances between the predicted pixel and its nearby block centers. The formula enables both prediction weights and prediction order to be adapted on a pixel-by-pixel basis. Extensive experiments have been conducted using JM 12.4. Compared with conventional block motion compensation, our scheme shows a bitrate saving of 18%, (5% on average) while maintaining the same or even higher PSNR (0.1 dB). It also provides a competitive advantage to variable block size motion compensation. Additionally, a hybrid of the two techniques achieves a further bitrate reduction of 13%. The result, nevertheless, provides only a lower bound on what is achievable since both motion estimation and mode decision were accomplished without considering OBMC. Further improvement is expected by incorporating iterative methods.
URI: http://hdl.handle.net/11536/17836
ISBN: 978-1-4244-4463-2
期刊: 2009 IEEE INTERNATIONAL WORKSHOP ON MULTIMEDIA SIGNAL PROCESSING (MMSP 2009)
起始頁: 397
結束頁: 401
顯示於類別:會議論文