Image analysis – Image enhancement or restoration
Patent
1996-05-29
1999-11-23
Lee, Thomas D.
Image analysis
Image enhancement or restoration
382260, 382274, 382279, 358448, 358530, G06K 940
Patent
active
059914564
ABSTRACT:
A method of improving a digital image is provided. The image is initially represented by digital data indexed to represent positions on a display. The digital data is indicative of an intensity value I.sub.i (x,y) for each position (x,y) in each i-th spectral band. The intensity value for each position in each i-th spectral band is adjusted to generate an adjusted intensity value for each position in each i-th spectral band in accordance with ##EQU1## where S is the number of unique spectral bands included in said digital data, W.sub.n is a weighting factor and "*" denotes the convolution operator. Each surround function F.sub.n (x,y) is uniquely scaled to improve an aspect of the digital image, e.g., dynamic range compression, color constancy, and lightness rendition. The adjusted intensity value for each position in each i-th spectral band is filtered with a common function and then presented to a display device. For color images, a novel color restoration step is added to give the image true-to-life color that closely matches human observation.
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Jobson Daniel J.
Rahman Zia-ur
Woodell Glenn A.
Lee Thomas D.
Science and Technology Corporation
The United States of America as represented by the Administrator
Van Bergen Peter J.
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