Adaptive anti-flicker method for VGA to TV data conversion

Details Adaptive anti-flicker method for VGA to TV data conversion Adaptive anti-flicker method for VGA to TV data conversion

1997-01-23

1999-04-13

Flynn, Nathan

Television

Format conversion

Field rate type flicker compensating

348622, 348625, H04N 701, H04N 521

Patent

active

058943307

ABSTRACT:
An adaptive anti-flicker data conversion system for converting picture data in a video graphic adapter for displaying on a television. The conversion system reduces flickers adaptively according to the luminance of a pixel and neighboring pixels one line above and below. Contrast difference and mean value are defined based on the luminance of three neighboring pixels. A contrast ratio is computed by dividing the contrast difference by the mean value. Three threshold values are defined for examining the contrast ratio and selecting an appropriate anti-flicker filter. Pixels having higher contrast ratio are processed with filters having stronger anti-flicker effect. The adaptive anti-flicker method reduces flickers without blurring every pixel in the picture data.

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patent: 5510843 (1996-04-01), Keene et al.
patent: 5642170 (1997-06-01), Hackett et al.
patent: 5708480 (1998-01-01), Bramba et al.
patent: 5742349 (1998-04-01), Choi et al.
patent: 5754246 (1998-05-01), Flannaghan

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