| 摘要 |
PROBLEM TO BE SOLVED: To provide an image signal processing apparatus capable of obtaining video images of superior image quality. SOLUTION: The image signal processing apparatus is provided with: an AGC circuit 70 for processing a video signal, containing an ineffective video signal period, having a vertical optical black signal and an effective video signal period, having a horizontal optical black signal and an effective video signal and following the ineffective video signal period and amplifying the video signal at an arbitrary gain; a clamping circuit 72 for clamping the reference level of the amplified video signal. The clamping circuit 72 respectively clamps the vertical optical black signal and the horizontal optical black signal by different clamping time constants. COPYRIGHT: (C)2005,JPO&NCIPI
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