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Proceedings Paper

Quadtree-based transform coding for multispectral image compression
Author(s): Jungwoo Lee
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Paper Abstract

A new multispectral image compression technique based on the KLT and the DCT is proposed. The quadtree for determining the block size and the quantizer for encoding the transform coefficients are jointly optimized in a rate-distortion sense. The problem is solved by a Lagrange multiplier approach. This approach was also used in an optimal MPEG encoding problem by the author. After a quadtree is determined by this approach, the KLT is applied to the spectral axis for each block before the DCT is applied on the spatial domain. The eigenvectors of the autocovariance matrix, the quantization scale, and the quantized transform coefficients for each block are the output of the encoder. The overhead information required in this scheme is the bits for the quadtree representation.

Paper Details

Date Published: 13 March 1996
PDF: 9 pages
Proc. SPIE 2669, Still-Image Compression II, (13 March 1996); doi: 10.1117/12.234763
Show Author Affiliations
Jungwoo Lee, David Sarnoff Research Ctr. (United States)

Published in SPIE Proceedings Vol. 2669:
Still-Image Compression II
Robert L. Stevenson; Alexander I. Drukarev; Thomas R. Gardos, Editor(s)

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