Solid-state image sensing device

A solid-state image sensing device, comprising:

• a plurality of pixels formed on a semiconductor substrate in matrix form, each having a photoelectric conversion element;
• a read-out circuit configured to read out electric signals obtained by the photoelectric conversion element in the plurality of pixels;
• and
• a signal processing unit configured to perform signal processing for the electric signal read out from the read-out circuit,
• wherein the plurality of pixels includes:
• a first pixel configured to lead an incident light of visible light wavelength to the photoelectric conversion element via a transparent film;
• a plurality of second pixels, each having a first color filter with a higher transmittance for a first visible light wavelength region than that for the other visible light wavelength region;
• a plurality of third pixels, each having a second color filter with a higher transmittance for a second visible light wavelength region different from the first visible light wavelength than that for the other visible light wavelength region;
• and
• a plurality of fourth pixels, each having a third color filter with a higher transmittance for a third visible light wavelength region different from the first and second visible light wavelengths than that for the other visible light wavelength region, and
• the signal processing unit performs the signal processing in units of a pixel block having at least the first to fourth pixels, and includes:
• a color acquisition unit configured to acquire a white pixel value corresponding to the first pixel of white color in the pixel block, a first color pixel value corresponding to the second pixel of a first color, a second color pixel value corresponding to the third pixel of a second color and a third color pixel value corresponding to the fourth pixel of a third color;
• an edge judgment unit configured to judge whether an edge is present around the first pixel which is a target pixel for the signal processing in the pixel block;
• a color separation unit configured to calculate color ratios for the first pixel based on the first to third color pixel values around the first pixel, and multiply the calculated color ratios by the white pixel value of the first pixel to color-separate the first pixel and calculate the first to third color pixel values for the first pixel when the edge judgment unit judges that an edge is not present around the target pixel;
• and
• a single color pixel calculation unit configured to calculate a single color pixel value by assuming the first pixel as an other single color except white without calculating the color ratios when the edge judgment unit judges that an edge is present around the target pixel, said other single color used to obtain luminance information.