Title :
A compact motion estimator with a simplified vector search strategy maintaining encoded picture quality
Author :
Hayashi, Naoya ; Kitsuki, Toshiaki ; Shiraishi, Takeshi ; Yokoyama, Toshimichi ; Oobuchi, Katsunari ; Ooi, Yasushi ; Ikegami, Seishi ; Tokuda, Norio ; Honma, Hideki ; Tamitani, Ichiro ; Miyazaki, Takashi ; Miyamoto, Yoshihiro ; Ohta, Mutsumi
Author_Institution :
ULSI Syst. Res. Labs., NEC Corp., Kawasaki, Japan
Abstract :
A compact motion estimator employing a simplified two-step full-search strategy has been proposed. In the first step, 2-pel precision motion vectors are obtained using 4-to-1 subsampling with a LPF. In the second step, half-pel precision vectors are obtained. The strategy reduces the number of operations and memory access cycles to 1/11 and 1/2, respectively, while maintaining encoded picture quality within 0.2 dB differences in SNRs. Using this estimator, a bidirectional motion compensation LSI with a -16.0/+15.5 pels search range has been developed for real-time MPEG1 video encoding
Keywords :
digital signal processing chips; large scale integration; motion compensation; motion estimation; search problems; video coding; LPF; LSI; SNR; bidirectional motion compensation; compact motion estimator; encoded picture quality; half-pel precision vectors; real-time MPEG1 video encoding; subsampling; two-pel precision vectors; two-step full-search strategy; Encoding; Information technology; Laboratories; Large scale integration; Motion compensation; Motion control; Motion estimation; National electric code; Sampling methods; Ultra large scale integration;
Conference_Titel :
Custom Integrated Circuits Conference, 1995., Proceedings of the IEEE 1995
Conference_Location :
Santa Clara, CA
Print_ISBN :
0-7803-2584-2
DOI :
10.1109/CICC.1995.518214
