Contour emphasizing circuit

Details Contour emphasizing circuit Contour emphasizing circuit

2008-01-22

2008-01-22

Hsia, Sherrie (Department: 2622)

Television

Image signal processing circuitry specific to television

Transition or edge sharpeners

C348S630000

Reexamination Certificate

active

07321401

ABSTRACT:
A contour emphasizing circuit which comprises a contour pick-up unit10for picking up a contour component HE from an input luminance signal Y, a level judging unit15for judging the luminance level of the input luminance signal Y, a coefficient control unit17for changing the coefficient in a plurality of steps depending upon a judgment signal and multiplying the contour component HE by the coefficient to output the product, and an adder14for adding the contour component outputted from the coefficient control unit17to the input luminance signal Y to output an emphasized-contour luminance signal. The coefficient to be multiplied by the contour component HE is changed in a plurality of steps depending upon the luminance level of the input luminance signal Y, and the contour component HE to be added to the input luminance signal Y is controlled to have a magnitude appropriate to the luminance level of the input luminance signal Y. As a result, the contour is emphasized according to the luminance level of the input luminance signal Y without causing excessive contour emphasis by adding a large contour component to a dark image of a small luminance level, thus preventing formation of unnatural images.

REFERENCES:
patent: 5303047 (1994-04-01), Yoshida
patent: 5923213 (1999-07-01), Darthenay et al.
patent: 2 260 621 (1973-06-01), None

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