1. 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 process 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 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 with respect to a first visible light wavelength band in a visible light wavelength band, as compared with the other visible light wavelength band; a plurality of third pixels, each having a second color filter having a higher transmissivity with respect to a second visible light wavelength band different from the first visible light wavelength band in a visible light wavelength band, as compared with the other visible light wavelength band; and a plurality of fourth pixels, each having a third color filter having a higher transmissivity with respect to a third visible light wavelength band different from the first and second visible light wavelength bands in a visible light wavelength band, as compared with the other visible light wavelength band, wherein the signal processing section includes: a color acquisition section configured to acquire a first color data value C 1 , a second color data value C 2 , a third color data value C 3 and a white color data value W in a target pixel block including a plurality of pixels to perform signal process; a first judgment section configured to determine whether or not the white data value W in the target pixel block is smaller than a predetermined first set value; and a white color correction section configured to perform correction processing of the white color data value W in the target pixel block based on the following Expression (1) when the judgment result of the first judgment section is NO, and to output the white data value W by itself without performing the correction processing based on the Expression (1) when the judgment result of the first determination section is YES; 
 W′=S 1 C 1 +S 2 C 2 +S 3 C 3 (1) where each of S 1 , S 2 , and S 3 is a coefficient that is determined based on a color balance.