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Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Improved Motion Estimation Using Early Zero-Block Detection | Hindawi Publishing Corporation EURASIP Journal on Image and Video Processing Volume 2008 Article ID 524793 8 pages doi 10.1155 2008 524793 Research Article Improved Motion Estimation Using Early Zero-Block Detection Y. M. Lee Y. J. Tsai and Y. Lin Department of Communication Engineering National Central University Chungli 32054 Taiwan Correspondence should be addressed to Y. M. Lee yuming0727@gmail.com Received 23 December 2007 Revised 13 May 2008 Accepted 24 June 2008 Recommended by Jian Zhang We incorporate the early zero-block detection technique into the UMHexagonS algorithm which has already been adopted in H.264 AVC JM reference software to speed up the motion estimation process. A nearly sufficient condition is derived for early zero-block detection. Although the conventional early zero-block detection method can achieve significant improvement in computation reduction the PSNR loss to whatever extent is not negligible especially for high quantization parameter QP or low bit-rate coding. This paper modifies the UMHexagonS algorithm with the early zero-block detection technique to improve its coding performance. The experimental results reveal that the improved UMHexagonS algorithm greatly reduces computation while maintaining very high coding efficiency. Copyright 2008 Y. M. Lee et al. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. INTRODUCTION The newest international video coding standard H.264 AVC has recently been approved by the ITU-T as recommendation H.264 and by ISO IEC as the international standard MPEG-4 part 10 advanced video coding AVC standard 1 . The emerging H.264 AVC achieves significantly better performance in both PSNR and visual quality at the same bit-rate compared with prior video coding standards such as MPEG4 part 2 and H.263. One important technique is the use of the .
