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 Center of Mass-Based Adaptive Fast Block Motion Estimation | Hindawi Publishing Corporation EURASIP Journal on Image and Video Processing Volume 2007 Article ID 65242 11 pages doi 2007 65242 Research Article Center of Mass-Based Adaptive Fast Block Motion Estimation Huna-Mina Chen1 Po-Huna Chen1 Kuo-Liana Yeh2 Wen-Hsien Fann2 Mon-Chau Shie 2 and Feipei Lai1 3 1 Department of Electrical Engineering National Taiwan University No. 1 Sec. 4 Roosevelt Road Taipei 10617 Taiwan 2 Department of Electronic Engineering National Taiwan University of Science and Technology No. 43 Sec. 4 Keelung Road Taipei 106 Taiwan 3 Department of Computer Science and Information Engineering National Taiwan University No. 1 Sec. 4 Roosevelt Road Taipei 10617 Taiwan Received 13 August 2006 Revised 28 January 2007 Accepted 29 January 2007 Recommended by Yap-Peng Tan This work presents an efficient adaptive algorithm based on center of mass CEM for fast block motion estimation. Binary transform subsampling and horizontal vertical projection techniques are also proposed. As the conventional CEM calculation is computationally intensive binary transform and subsampling approaches are proposed to simplify CEM calculation the binary transform center of mass BITCEM is then derived. The BITCEM motion types are classified by percentage of 0 0 BITCEM motion vectors. Adaptive search patterns are allocated according to the BITCEM moving direction and the BITCEM motion type. Moreover the BITCEM motion vector is utilized as the initial search point for near-still or slow BITCEM motion types. To support the variable block sizes the horizontal vertical projections of a binary transformed macroblock are utilized to determine whether the block requires segmentation. Experimental results indicate that the proposed algorithm is better than the five conventional algorithms that is three-step search TSS newthree-step search N3SS four three-step search 4SS block-based gradient decent search BBGDS and diamond search DS in terms of speed or picture quality for eight .
