Television – Image signal processing circuitry specific to television – Transition or edge sharpeners
Patent
1993-08-02
1995-11-21
Groody, James J.
Television
Image signal processing circuitry specific to television
Transition or edge sharpeners
348627, 382266, H04N 521
Patent
active
054692253
ABSTRACT:
An apparatus and a method for enhancing a transient edge of a video signal. The enhancement apparatus comprises a transient edge detecting circuit for first degree-differentiating the video signal inputted therein, comparing an absolute value of the first degree-differentiated video signal with a reference value and detecting the transient edge of the video signal in accordance with the compared result, a transient edge dividing circuit for second degree and third degree-differentiating the absolute value of the first degree-differentiated video signal and outputting the resultant transient edge divide signal, a transient edge interpolating circuit for interpolating a value which is obtained by weighting and averaging start and end pixel values of the transient edge based on a transient edge detection signal from the transient edge detecting circuit into the transient edge of the inputted video signal in an interpolation interval and for replacing start and end pixel values of the transient edge of the inputted video signal with the start and end pixel values of the transient edge based on the transient edge detection signal in a replacement interval, and a mixing circuit for outputting the inputted video signal in a non-transient edge interval and the interpolated or replaced video signal in a transient edge interval.
REFERENCES:
patent: 4758891 (1988-07-01), Hitchcock et al.
patent: 4780623 (1988-10-01), Yagi
patent: 4918528 (1990-04-01), Oohashi
patent: 5023919 (1991-06-01), Wataya
patent: 5146319 (1992-09-01), Engel et al.
patent: 5237625 (1993-08-01), Yamashita et al.
Goldstar Co. Ltd.
Groody James J.
Lee Michael H.
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