Image analysis – Color image processing – Color correction
Patent
1997-06-19
1999-12-14
Chang, Jon
Image analysis
Color image processing
Color correction
358523, 358525, G06K 900
Patent
active
060027959
ABSTRACT:
The present invention is a method and apparatus for computing color transformations of source images. It performs color transformations using a lookup table and a hashing block for referencing entries in the lookup table. The index generated by the hashing block is dependent on a first color value. A color encoding block is coupled to the lookup table for generating an encoded color value dependent on the first color value. The index produced by the hashing block is further dependent upon response characteristics of the human eye. The hashing block generates indexes referencing widely separated entries in the plurality of entries of the lookup table when first color values have small differences in value. A comparing block is coupled to the lookup table and the color encoding block for comparing the entry of the lookup table and the encoded color value to determine a match. A color calculation block is coupled to the lookup table for generating a second color value dependent on the first color value. The color calculation block generates the second color value when a match does not occur. The second color value is also stored in the entry of the lookup table. When a match does occur, the lookup table outputs the second color value instead of calculating a new second color value. In the preferred embodiment of the present invention, the hashing block comprises a plurality of lookup tables and a logic block coupled to the plurality of lookup tables for generating the index.
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Eames Andrew
Schwarz, Jr. James K.
Chang Jon
Electronics For Imaging, Inc.
Glenn Michael A.
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