Schaltungen zur Kompensation des horizontalen Randes

摘要

A horizontal edge compensation circuit includes a delay circuit 190 for delaying an input luminance signal for a certain time, a waveform converter 300 for differentiating the input luminance signal to take its absolute value, and reshaping the waveform of the signal, a quantization means 400 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 control portion 500 for selectively multiplying the reshaped signal according to the code signal, thereby controlling the degree of horizontal edge compensation, and an adder 200 for adding the luminance signal delayed for a certain time in the delay circuit 190 to the horizontal edge compensation signal output from the gain control portion 500. 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.