Encoding and decoding of color digital image using wavelet and f

Details Encoding and decoding of color digital image using wavelet and f Encoding and decoding of color digital image using wavelet and f

1997-08-26

1999-12-14

Boudreau, Leo H.

Image analysis

Color image processing

Compression of color images

382233, 382249, G06K 936, G06K 946

Patent

active

060027940

ABSTRACT:
Color digital image data is encoded and compressed by a technique which combines the advantages of both wavelet and fractal encoding. The technique produces an encoded image separated by color components which can be efficiently matched to other compressed images in order to identify the image being processed. The encoding technique divides the images at numerous scales produced by wavelet transformations and forms blocks comprising of groups of pixels at each scales. The average modulus values and average angles values of the data in each of the blocks are compared to the next higher scale. Each scale is then encoded for the blocks which have corresponding matching blocks in the adjacent scale. The technique provides the edge retention benefits of wavelet and the compression benefits of fractal encoding and also accelerates the matching process between the scales. A decoding technique which uses a cross scale approximation of wavelet coefficients is used to reconstruct the image.

REFERENCES:
patent: 5144688 (1992-09-01), Bovir et al.
Rinaldo et al, "An improved Wavelet-Fractal coder," Circuits and Systems, 1994 IEEE International Symposium, vol. 3, pp. 113-116.
Mallat et al, "Characterization of Signals from Multiscale Edges", IEEE Transactions on Pattern Analysis and Machine Intelligence, vol. 14, No. 7, Jul. 1992, pp. 710-732.

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