Multi-bit image edge enhancement method and apparatus

Details Multi-bit image edge enhancement method and apparatus Multi-bit image edge enhancement method and apparatus

1992-05-29

1995-03-07

Jankus, Almis

395128, 395129, G06F 1562

Patent

active

053965841

ABSTRACT:
Multi-bit image edge enhancement method and apparatus wherein a group of gradient mask matrices are applied to a "current matrix", wherein a TBAP (To Be Adjusted Pixel) is surrounded by neighboring pixels, to determine if the TBAP is at a location where a change of brightness occurs. From this matrix operation, a conclusion is derived as to the existence or non-existence of an edge and the direction of the brightness change. The current matrix and a predetermined number of previously evaluated and yet to be evaluated pixels are then compared to a set of reference bit patterns which depict possible segment changes to be corrected. If the result indicates that the TBAP is on an edge of a changing edge segment, a corresponding code will be generated to modify the TBAP to enhance the smoothness of a segment transition. In the case of an electrophotographic or a gray scale printing machine, the specific code will change either the location or the size of the TBAP; whereas in the case of a monochrome screen display, the specific code will change the intensity of the TBAP.

REFERENCES:
patent: 5029108 (1991-07-01), Lung

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