Method and circuit for adaptively enhancing contour components o

Details Method and circuit for adaptively enhancing contour components o Method and circuit for adaptively enhancing contour components o

1997-11-25

2000-11-14

Lee, Thomas D.

Image analysis

Image enhancement or restoration

Edge or contour enhancement

382254, 348606, 348623, 348627, G06K 940

Patent

active

061481165

ABSTRACT:
A contour enhancement method and circuit for adaptively enhancing a contour component of a luminance signal. In the method, a coring operation is performed with respect to the contour component. For the coring operation, a coring value is used which is adjusted according to characteristics of the contour component detected from an input luminance signal. The cored contour component is amplified by a predetermined gain, and the level of the gain-controlled contour component is limited to a predetermined threshold value to output a level-limited contour component. The level-limited contour component is then added to the input luminance signal to become a contour-enhanced luminance signal.

REFERENCES:
patent: 3789133 (1974-01-01), Kline
patent: 4437124 (1984-03-01), Cochran
patent: 4536796 (1995-08-01), Harlan
patent: 4573075 (1986-02-01), Bolger

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