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Proceedings Paper

Piecewise linear compression scheme for PC video cameras
Author(s): Jun Li; Iskender Agi
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Paper Abstract

To keep cost low, most of the commercial color camera products for PC video conferencing employ a single CCD or CMOS imager. Usually, a mosaic color filter array is applied to the CCD or CMOS focal plane array image sensor in order to extract color information from the image through post-processing. Thus the output data of each color component is interlaced in every output line from the imager. This paper proposes a new scan- line based image compression technique for PC video conferencing. It takes the advantages of PC's advanced computation power and provides end users the capability of performing image decompression and color interpolation on demand. Without doing any color interpolation before image compression, piecewise linear compression is performed on raw line data. It generates a single control point set for all color components of the same line and packs the control points into a compact format so that a small lookup table for variable-length Huffman encoding can be applied. The simplicity of piecewise-linear approximation and variable- length encoding leads to low-cost ASIC implementation and fast speed image compression solution with improved compression ratio, better color fidelity, and capability to implement decoding in parallel processing.

Paper Details

Date Published: 28 December 1998
PDF: 6 pages
Proc. SPIE 3653, Visual Communications and Image Processing '99, (28 December 1998); doi: 10.1117/12.334616
Show Author Affiliations
Jun Li, Exar Corp. (United States)
Iskender Agi, Exar Corp. (United States)

Published in SPIE Proceedings Vol. 3653:
Visual Communications and Image Processing '99
Kiyoharu Aizawa; Robert L. Stevenson; Ya-Qin Zhang, Editor(s)

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