Image compression method and apparatus employing principal compo

Details Image compression method and apparatus employing principal compo Image compression method and apparatus employing principal compo

1991-03-06

1994-04-05

Moore, David K.

Image analysis

Histogram processing

For setting a threshold

382 17, G06K 936

Patent

active

053012410

ABSTRACT:
A method and apparatus for compressing digital data defining the colour component content of pixels of a coloured image, the apparatus comprises a processor (1) for performing a principal component analysis on each of a number of non-overlapping blocks of pixels making up the image to determine the principal component vectors corresponding to the block; for rounding the principal component vectors to a fixed set of intervals; for transforming the original pixel data into the colour space defined by the rounded principal component vectors; for performing a compression algorithm on the transformed pixel data; and for performing a separate compression algorithm on the rounded principal component vector values.

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Ali Hababi & Guner S. Robinson, "A Survey of Digital Picture Coding", Computer, May 1974, pp. 22-33.
"Electronic Hardware Implementation of the Principal Components Transformation for Multichannel Image Data", A. A. D. Canas, IEE Proceedings, vol. 131, pp. 761-768, No. 7, Dec. 1984.
"Adaptive Transform Coding of Four-Color Printed Imaged", M. Gilge, IEEE, pp. 1374-1377, 1987 International Conference on Acoustics, Speech, and Signal Processing, Apr. 6-9, 1987, Dallas, Texas.
"Bandwidth Compression of Images Using Transform Techniques", T. A. Soame, G.E.C. Journal of Science and Technology, vol. 48 (1982), No. 1, pp. 17-23, Rugby, Great Britain.
"Transform Picture Coding", P. Wintz, Proceedings of the IEEE, vol. 60, No. 7, Jul. 1971, pp. 809-820.
"IEEE Transactions on Acoustics, Speech and Signal Processing", vol. ASSP-32 (1984) Feb., No. 1, New York, pp. 173-177.

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