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28 December 1998 Piecewise linear compression scheme for PC video cameras
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Proceedings Volume 3653, Visual Communications and Image Processing '99; (1998)
Event: Electronic Imaging '99, 1999, San Jose, CA, United States
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.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jun Li and Iskender Agi "Piecewise linear compression scheme for PC video cameras", Proc. SPIE 3653, Visual Communications and Image Processing '99, (28 December 1998);


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