A 41 mW VGA@30 fps Quadtree Video Encoder for Video Surveillance Systems

Qin LIU  Seiichiro HIRATSUKA  Kazunori SHIMIZU  Shinsuke USHIKI  Satoshi GOTO  Takeshi IKENAGA  

IEICE TRANSACTIONS on Electronics   Vol.E91-C   No.4   pp.449-456
Publication Date: 2008/04/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e91-c.4.449
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Advanced Technologies in Digital LSIs and Memories)
video surveillance system,  motion estimation,  ME-MC processor,  quadtree,  low power consumption,  

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Video surveillance systems have a huge market, as indicated by the number of installed cameras, particularly for low-power systems. In this paper, we propose a low-power quadtree video encoder for video surveillance systems. It features a low-complexity motion estimation algorithm, an application-specific ME-MC processor, a dedicated quadtree encoder engine and a processor control-based clock-gating technique. A chip capable of encoding 30 fps VGA (640480) at 80 MHz is fabricated using 0.18 µm CMOS technology. A total of 153 K gates with 558 kbits SRAM have been integrated into a 5.0 mm3.5 mm die. The power consumption is 40.87 mW at 80 MHz for VGA at 30 fps and 1.97 mW at 3.3 MHz for QCIF at 15 fps.