Solid-state image sensor

A solid-state image sensor, comprising:

• a plurality of pixels which are formed in matrix form on a semiconductor substrate, each pixel having a photoelectric converting element which outputs an electric signal obtained by photoelectric conversion;
• a read-out circuit configured to read out the electric signals outputted from the plurality of pixels;
• and
• a signal processing section configured to perform signal processing with respect to the electric signals read out from the read-out circuit,
• wherein the plurality of pixels includes:
• a plurality of first pixels which leads incident light of a visible light wavelength band to a corresponding photoelectric conversion element via a transparent layer;
• a plurality of second pixels, each having a first color filter having a higher transmissivity in a first visible light wavelength band within the visible light wavelength band, as compared to a transmissivity in a first remaining portion of the visible light wavelength band outside the first visible wavelength band;
• a plurality of third pixels, each having a second color filter having a higher transmissivity in a second visible light wavelength band, different from the first visible light wavelength band, within the visible light wavelength band, as compared to a transmissivity in a second remaining portion of the visible light wavelength band outside the second visible wavelength band;
• and
• a plurality of fourth pixels, each having a third color filter having a higher transmissivity in a third visible light wavelength band, different from the first and second visible light wavelength bands, within the visible light wavelength band, as compared to a third remaining portion of the visible light wavelength band outside the third visible wavelength band,
• wherein the signal processing section includes:
• a color acquisition section configured to acquire a first color data value C1, a second color data value C2, a third color data value C3 and a white color data value W in a target pixel block including a plurality of pixels to perform signal process;
• a color separation processing section configured to separate the white data value into a plurality of colors based on the following Expressions (2) to (4) to generate the first color data value C1w of a first color, the second color data value C2w of a second color and the third color data value C3w of a third color;
• C1W←W·K1 (2)
• C2W←W·K2 (3)
• C3W←W·K3 (4)
• where K1, K2, and K3 indicate color ratios, and are determined by the color data values C1, C2 and C3.