Image analysis – Color image processing
Patent
1996-04-26
1999-06-08
Coles, Edward L.
Image analysis
Color image processing
382165, 382141, 382143, 382151, G06K 900
Patent
active
059110031
ABSTRACT:
An imaging device coupled to a processor generates a number of image signals corresponding to a multicolor pattern of an item in motion. Each of a number of regions of the pattern is correlated to one of a number of reference colors to generate a segmented image of the pattern. The processor models the multicolor pattern by deriving a number of test values from the segmented image representation. Each test value is representative of a corresponding one of the regions and is determined as a function of region size independent of orientation of the multicolor pattern. The test values are compared to reference data to detect a variation of the item. The reference colors may be determined from color pairs with each pair having a first member from a first set of sample colors and a second member from a second set of sample colors. The first member is closer to the second member than any other color of the second set in the color space, and the second member is closer to the first member than any other color of the first set in the color space. An image of the item randomly oriented with respect to a model image is characterized by generating a number of characteristic values within the processor with respect to rotational position about an item image point. A rotationally correlated item image is generated as a function of the characteristic values for evaluation.
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Coles Edward L.
Lee Cheukfan
Pressco Technology Inc.
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