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Proceedings Paper

Adaptive color subsampling of images
Author(s): Anil M. Murching; John W. Woods
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Paper Abstract

New methods for the subsampling of color images are presented. A block-based orthogonalizing transform is used to represent the RGB image in an efficient domain. This transformation offers substantial advantages when preceded by a segmentation of the image based on chrominance content. An adaptive scheme, based on a threshold test on the local variance, is proposed for subsampling the resulting chrominance-related components. The proposed subsampling scheme outperforms conventional methods based on transforms such as the YCRCB, in terms of an improved quality versus sample-rate (or bit-rate) trade-off. It is possible to achieve 4:4:4 quality at near 4:2:0 rates. A block-based strategy to code the resulting color image components is also presented, which is based on the JPEG Baseline method.

Paper Details

Date Published: 22 October 1993
PDF: 9 pages
Proc. SPIE 2094, Visual Communications and Image Processing '93, (22 October 1993); doi: 10.1117/12.157876
Show Author Affiliations
Anil M. Murching, Rensselaer Polytechnic Institute (United States)
John W. Woods, Rensselaer Polytechnic Institute (United States)


Published in SPIE Proceedings Vol. 2094:
Visual Communications and Image Processing '93
Barry G. Haskell; Hsueh-Ming Hang, Editor(s)

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