Method of improving a digital image

专利名称：Method of improving a digital image发明人：Zia-ur Rahman,Daniel J. Jobson,Glenn A.

Woodell

申请号：US08/654840申请日：19960529公开号：US05991456A公开日：19991123

摘要：A method of improving a digital image is provided. The image is initiallyrepresented by digital data indexed to represent positions on a display. The digital datais indicative of an intensity value I.sub. i (x, y) for each position (x,y) in each i-th spectralband. The intensity value for each position in each i-th spectral band is adjusted togenerate an adjusted intensity value for each position in each i-th spectral band inaccordance with ##EQU1## where S is the number of unique spectral bands included insaid 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 digitalimage, e.g., dynamic range compression, color constancy, and lightness rendition. Theadjusted intensity value for each position in each i-th spectral band is filtered with acommon function and then presented to a display device. For color images, a novel colorrestoration step is added to give the image true-to-life color that closely matches humanobservation.

申请人：SCIENCE AND TECHNOLOGY CORPORATION,THE UNITED STATES OFAMERICA AS REPRESENTED BY THE ADMINISTRATOR OF THE NATIONAL AERONAUTICSAND SPACE ADMINISTRATION

代理人：Peter J. Van Bergen

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