VLSI-Oriented Motion Estimation Using a Steepest Descent Method in Mobile Video Coding
Masayuki Miyama, Junichi Miyakoshi, Kousuke Imamura, Hideo Hashimoto, Masahiko Yoshimoto · IEICE Transactions on Electronics · 2004
SUMMARY This paper describes a VLSI-oriented motion estimation algorithm using a steepest descent method (SDM) applied to MPEG-4 visual communication with a mobile terminal. The SDM algorithm is optimized for QCIF or CIF resolution video and VLSI implementation. The SDM combined with a subblock search method is developed to enhance picture quality. Simulation results show that a mean PSNR drop of the SDM algorithm processing QCIF 15 fps resolution video in comparison with a full search algorithm is −0.17 dB. Power consumption of a VLSI based on the SDM algorithm assuming 0.18 µm CMOS technology is estimated at 2 mW. The VLSI attains higher picture quality than that based on the other fast motion estimation algorithm, and is applicable to mobile