Image contour enhancing apparatus which limits enhancement where

Details Image contour enhancing apparatus which limits enhancement where Image contour enhancing apparatus which limits enhancement where

1994-06-27

1995-07-11

Groody, James J.

Television

Image signal processing circuitry specific to television

Transition or edge sharpeners

348625, H04N 5208

Patent

active

054325633

ABSTRACT:
An image contour enhancing apparatus capable of minimizing excessive enhancement of the image contour in an image area where both a horizontal contour enhancing signal and a vertical contour enhancing signal are generated in overlapping relation. In the image contour enhancing apparatus, an image contour enhancing signal produced by deriving a horizontal contour enhancing signal from a video input signal by a high-pass filter, deriving a vertical contour enhancing signal from the video input signal by another high-pass filter and by adding these contour enhancing signals is added by an adder to the video input signal to improve the sharpness of the image contour, and circuits are provided for making variable the signal level of the image contour enhancing signal in the image area where both the horizontal and vertical contour enhancing signals are generated in overlapping relation.

REFERENCES:
patent: 3946152 (1976-03-01), Illetschko et al.
patent: 4086618 (1978-04-01), Koubek
patent: 4962419 (1990-10-01), Hibbard et al.

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