| 摘要 |
A video signal processing apparatus capable of improving signal level while reducing noise component no matter a video signal of what illuminance is input is provided, which apparatus includes a video signal amplifying circuit (1, 2, 4) amplifying an input video signal and outputting a video signal of a predetermined image size in accordance with a gain control coefficient, a frame addition circuit (5, 6) connected to the video signal amplifying circuit (1, 2, 4) for adding outputs of the video signal amplifying circuit (1, 2, 4) by a predetermined number of frames, a first signal level detecting circuit (3) connected to the video signal amplifying circuit (1, 2, 4) and calculating the gain control coefficient and a multiplication coefficient in accordance with an output of the video signal amplifying circuit (1, 2, 4), and a first multiplier (9) connected to the frame addition circuit (5, 6) and the first signal level detecting circuit (3) and receiving as inputs an output of the frame addition circuit (5, 6) and the multiplication coefficient. <IMAGE> |
