Edge enhancement method and apparatus for dot matrix devices

Details Edge enhancement method and apparatus for dot matrix devices Edge enhancement method and apparatus for dot matrix devices

G - Physics

09

G

G09G 5/36 (2006.01) G06K 15/02 (2006.01) G06K 15/12 (2006.01) G06T 5/00 (2006.01) G09G 5/20 (2006.01)

Patent

CA 2052011

Edge enhancement method and apparatus for dot matrix devices 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 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.

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