Method of filtering images using image compressibility to determ

Details Method of filtering images using image compressibility to determ Method of filtering images using image compressibility to determ

1998-04-07

2000-01-18

Lee, Thomas D.

Image analysis

Image enhancement or restoration

Image filter

382261, H04B 166

Patent

active

060163666

ABSTRACT:
A method of filtering an image to reduce noise. The image is divided into subimages or "blocks". An optimum value of a threshold parameter is determined by repeatedly applying a Singular Value Decomposition ("SVD") transform to one of the blocks for various values of the threshold parameter and then using a lossless compression algorithm to determine the compressed size of the various transforms. The optimum threshold parameter is determined by finding the maximum of the second derivative of the compressed size with respect to the log of the threshold parameter. The SVD transform is then applied to all the blocks using the optimum value of the threshold parameter, and the transformed blocks are then recombined to provide the filtered image.

REFERENCES:
patent: 4802110 (1989-01-01), Richards et al.
patent: 5010504 (1991-04-01), Lee et al.
patent: 5400371 (1995-03-01), Natarajan
patent: 5561723 (1996-10-01), DesJardins et al.
patent: 5787209 (1998-07-01), Konstantinides et al.

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