Title :
Multiresolution displacement fields for motion compensated video coding
Author :
Subramanian, Pattabiraman ; Bi, Hao ; Chan, Wai-Yip
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., Illinois Univ., Chicago, IL, USA
Abstract :
In motion compensated video coding, the rate-distortion efficiency of coding the motion information becomes increasingly critical as the overall bit rate of the coder drops. The efficiency can be improved by allocating bits to regions of the displacement field in accordance with the significance of each region. This forms the motivating factor to use multiresolution displacement fields, specifically nonuniformly sampled displacement fields. In this paper we examine two methods of constructing and coding multiresolution displacement fields. We propose a novel fast search scheme which combines the advantages of both methods, but with little sacrifice of performance. We compare these methods in terms of their rate-distortion performance, computational complexity, and motion compensation quality at very low bit rates.
Keywords :
computational complexity; image resolution; image sampling; image segmentation; motion compensation; motion estimation; rate distortion theory; video coding; computational complexity; fast Lagrangian search scheme; hierarchical motion estimation; motion compensated video coding; motion compensation quality; multiresolution displacement fields; nonuniformly sampled displacement fields; rate-distortion efficiency; very low bit rate coding; Bismuth; Bit rate; Motion compensation; Motion estimation; PSNR; Rate-distortion; Sampling methods; Signal resolution; Video coding; Voltage control;
Conference_Titel :
Signals, Systems and Computers, 1996. Conference Record of the Thirtieth Asilomar Conference on
Conference_Location :
Pacific Grove, CA, USA
Print_ISBN :
0-8186-7646-9
DOI :
10.1109/ACSSC.1996.599152