Horizontal edge compensation circuit for a digital image process

Details Horizontal edge compensation circuit for a digital image process Horizontal edge compensation circuit for a digital image process

1991-09-12

1994-06-14

Groody, James J.

Television

Image signal processing circuitry specific to television

Transition or edge sharpeners

348616, 348614, 348678, H04N 5208

Patent

active

053215117

ABSTRACT:
A horizontal edge compensation circuit includes a delay circuit for delaying an input luminance signal for a certain time, a waveform converter for differentiating the input luminance signal to take its absolute value, and reshaping the waveform of the signal, a quantization circuit for differentiating again the first differentiated signal, comparing to predetermined reference levels the first differentiated signal obtained by emphasizing a signal having a low level difference and bypassing a signal having a high level difference, and then generating a code signal to quantize the second differentiated signal, a gain controller for selectively multiplying the reshaped signal according to the code signal, and controlling the degree of horizontal edge compensation, and an adder for adding the luminance signal delayed for a certain time in the delay circuit to the horizontal edge compensation signal output from the gain control portion. The circuit reduces transition time of luminance level of a video signal and boosts a signal having a low level difference to emphasize the horizontal edge, thereby improving the resolution of a picture.

REFERENCES:
patent: 4030121 (1977-06-01), Faroudja
patent: 4262304 (1981-04-01), Faroudja
patent: 4263616 (1981-04-01), Lee
patent: 4771192 (1988-09-01), Jackson
patent: 4931858 (1990-06-01), Honjo

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