Image analysis – Image enhancement or restoration – Object boundary expansion or contraction
Patent
1997-06-19
1998-11-24
Kelley, Christopher
Image analysis
Image enhancement or restoration
Object boundary expansion or contraction
G06K 944
Patent
active
058419101
ABSTRACT:
The invention provides an image processing method such as line thickness reduction performed for a digital image from an image reading system, which is improved in that regular mask patterns can be determined to realize simplification and increase of the speed of line thickness reduction processing and production of branch-like fine lines upon line thickness reduction based on mask processing is prevented to allow character recognition or graphic recognition to be performed with certainty. Line thickness reduction processing using a plurality of mask patterns of a first type each provided for changing a black picture element protruding at a boundary portion of an area of black picture elements of image data to a white picture element is first performed repetitively, and then, after the image data no more has a black picture element which may be changed to a white picture element using any of the mask patterns of the first type, a plurality of mask patterns of a second type each provided for changing a black picture element of the original image data at the center of the matrix to a white picture element to scoop out a boundary portion of the area of black picture elements of the image data are added to the mask patterns of the first type and line thickness reduction processing is performed repetitively using the mask patterns of the first and second types.
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Fujitsu Limited
Kelley Christopher
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