| 摘要 |
A contour correction circuit includes a delay circuit for delaying an input video signal, a corrected waveform generating circuit for generating a contour correction signal out of the input video signal, a variable amplifier for controlling an amplitude of the contour correction signal, a contour control circuit for outputting a gain control signal for controlling a gain in the variable amplifier,. and a first adding circuit for adding an output signal of the delay circuit to an output of the amplifier. When an amplitude-change in an edge portion of the input video signal is over a given level, the smaller amount of contour is corrected at the larger amplitude change. Therefore, even if a signal of a high contrast ratio is adjacent to a signal of a low contrast ratio, desirable contour corrections can be provided to respective signal components.
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