Signal processing circuit for image sensor

Details Signal processing circuit for image sensor Signal processing circuit for image sensor

H - Electricity

04

N

350/47

H04N 5/14 (2006.01) H04N 5/18 (2006.01)

Patent

CA 1202411

ABSTRACT OF THE DISCLOSURE There is disclosed a signal processing circuit for an image sensor. This circuit comprises: an image sensor having an optical black level detecting portion (i.e., an optical black); a buffer circuit for receiving an output signal from the image sensor; a clamping circuit for receiving an output from the buffer circuit; and a low-pass filter provided between the buffer circuit and the clamping circuit. This low-pass filter is made operative by a switching circuit in the interval responsive to the black level detecting portion in the output signal of the image sensor, while it is made inoperative in the interval responsive to the image pickup signal detecting portion. According to this circuit, the black level drift can be followed, thereby preventing the appearance of line noise on the screen without being influenced by the sag component due to the AC coupling.

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