PURPOSE: To extend the dynamic range by reducing a transmission rate of a color filter having a maximum transmission rate so that an output signal is nearly equal to that of other color filters.
CONSTITUTION: Let an output signal component depending on a spectral characteristic in a range from 400nm to 500nm when a reference white level is picked up to be (b), an output signal component depending on a spectral characteristic in a range from 500nm to 600nm to be (2g) with respect to pixels of a Cy filter, and let an output signal component depending on a spectral characteristic in a range from 600nm to 700nm to be (r) with respect to pixels of a Ye filter. Then an output signal Go of picture elements of a G filter is 2g, an output signal Cyo of pixels of a Cy filter is b+2g, and an output signal Yeo of pixels of a Ye filter is 2g+r. Furthermore, the spectral characteristic of a W filter is formed so that an output signal Wo of pixels of the Y filter is 3(b+2g+r)/4. That is, the spectral characteristic of the color filter of a conventional solid- state image pickup element is multiplied by 3/4.
YONEYAMA MASAYUKI
TANIZOE YUKIHIRO
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