Real-Time Software Video Codec with a Fast Adaptive Motion Vector Search

Authors:
Tatsuji Moriyoshi;Hiroshi Shinohara;Takashi Miyazaki;Ichiro Kuroda
Affiliations:
Multimedia Research Laboratories, NEC Corporation, 1-1, Miyazaki 4-chome, Miyamae-ku, Kawasaki 216-8555, Japan;NEC Information Technologies, 4-10, Shiba 4-Chome, Minato-Ku, Tokyo 108-0014, Japan;Multimedia Research Laboratories, NEC Corporation, 1-1, Miyazaki 4-chome, Miyamae-ku, Kawasaki 216-8555, Japan;Multimedia Research Laboratories, NEC Corporation, 1-1, Miyazaki 4-chome, Miyamae-ku, Kawasaki 216-8555, Japan
Venue:
Journal of VLSI Signal Processing Systems - Special issue on signal processing systems design and implementation
Year:
2001

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Abstract

A PC-based real-time software MPEG-4 video codec with a fast adaptive motion vector search is presented. In a fast adaptive motion estimation (ME) technique, the search order is dynamically changed in according with the motion of objects. This technique suppresses load fluctuation in the ME and contributes to the stable real-time work of the software codec. MMX instructions are used to increase the codec speed. On a portable PC, the software video codec supports satisfactory mobile visual communication at 64 kbps and 128 kbps, for example, at QCIF 15 fps. The codec on a 450 MHz PentiumII processor can encode and decode 30 CIF frames in real-time.