| 摘要 |
Voltage signals outputted from a CCD are subjected to correlated double sampling processing by a correlated double sampling circuit (CDS), after which digital gain processing is carried out at a gain control amplifier (GCA). A gain difference between G color signals and R/B color signals outputted from the CCD is caused by a difference between a G exposure duration t<SUB>G </SUB>and an R/B exposure duration t<SUB>R/B</SUB>. When the value of a ratio between the t<SUB>G </SUB>and the t<SUB>R/B </SUB>falls below a predetermined value, the GCA applies digital gain for compensating for the gain difference by multiplying respective signal values of R, G and B by gain correction coefficients as follows: (gain compensation coefficient alpha)=(G exposure duration t<SUB>G</SUB>)/(R/B exposure duration t<SUB>R/B</SUB>)=(G exposure duration t<SUB>G</SUB>)/((G exposure duration t<SUB>G</SUB>)+(exposure duration difference Deltat)).
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