Image analysis – Histogram processing – For setting a threshold
Patent
1993-10-29
1994-07-12
Mancuso, Joseph
Image analysis
Histogram processing
For setting a threshold
345136, 358447, 348625, G06K 940, G09G 106
Patent
active
053295994
ABSTRACT:
The contour fidelity of reproduction of images is enhanced by matching groups of pixels with templates based on a hierarchical set of patterns. This is accomplished by isolating a symmetrical window of pixels in the image including a central pixel and matching the groups of pixels in the window with hierarchical templates. Enhancement values for the central pixel are provided based on the results of the comparison. Windows are formed so that each pixel in the image is a central pixel for at least one window. The hierarchial set of patterns is developed so that each pattern in the hierarchy is a combination of an extension pattern and the pattern immediately below it in the hierarchy. This significantly reduces the hardware requirements for implementation of the technique. Templates are developed by creating horizontal, vertical, reversed and inverted permutations of each pattern in the set. Correctable pixel locations are identified for each template, and the central pixel receives enhancement values when it is in the correctable location of at least one template. In an microaddressable printer, overscanning and increased clock frequency provide multiple segments for representing each pixel, and spot width compensation allows multiple intensity levels for each segment.
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Curry Douglas N.
Filshtinsky Sofia
St. John Robert P.
Fox David
Jacobs R. Christine
Mancuso Joseph
Xerox Corporation
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