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 |