Inventors:
James W. Young - Phoenix AZ
Donald J. Voss - Phoenix AZ
Assignee:
Motorola, Inc. - Schaumburg IL
International Classification:
H04N 521
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.