Method for reducing flicker and circuit therefor

Details Method for reducing flicker and circuit therefor Method for reducing flicker and circuit therefor

1996-12-02

1999-07-27

Harvey, David E.

Television

Image signal processing circuitry specific to television

Noise or undesired signal reduction

348910, H04N 521

Patent

active

059299355

ABSTRACT:
A method and circuit (20) for reducing flicker. Pixel values (Y.sub.0, Y.sub.1, Y.sub.-1) are transmitted to input terminals (23, 21, 22) of the circuit (20). A first difference magnitude is calculated by subtracting the pixel value (Y.sub.0) of a middle pixel from the pixel value (Y.sub.-1) of an upper pixel and taking an absolute value of the result. A second pixel magnitude is calculated by subtracting the pixel value (Y.sub.0) of the middle pixel from the pixel value of a lower pixel and taking an absolute value of the result. A larger of the first and second pixel magnitudes is compared to a user-selected threshold value. The pixel value (Y.sub.0) of the middle pixel is either changed or left unchanged in accordance with the results of the comparison.

REFERENCES:
patent: 4768092 (1988-08-01), Ishikawa
patent: 4799105 (1989-01-01), Mitchell et al.
patent: 5136385 (1992-08-01), Campbell
patent: 5146329 (1992-09-01), Flamm
patent: 5285277 (1994-02-01), Min

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