Solid-state image sensor, and imaging system

A solid-state image sensor comprising:

• pixels arranged in a two-dimensional pixel array, where each pixel includes a photoelectric conversion device;
• and
• a filter bank array comprised of a plurality of filter banks overlaying a light incident surface of the two dimensional pixel array, the filter bank array having N×M filter banks where N and M are each integers of 1 or more,
• wherein,
• each filter bank comprises a plurality of filters which are not all selective to a same electromagnetic wavelength,
• each filter bank overlays an array of U×V pixels where U and V are each integers of 2 or more,
• each filter of each filter bank array overlays two or more photoelectric conversion devices,
• each filter bank is identical to every other filter bank in terms of arrangement of the filters,
• for each filter bank, the outputs of the photoelectric conversion devices of that filter bank are combined to provide an electromagnetic spectrum waveform unique to that filter bank with values for a plurality of wavelengths, and
• each filter includes a spectrum function establishing only one electromagnetic wavelength band to be detected by all of the photoelectric conversion devices overlain by the filter and a periodic fine pattern shorter than the electromagnetic wavelength to be detected by the photoelectric conversion devices overlain by the filter, the periodic fine pattern absorbing or passing a specific electromagnetic wave in the electromagnetic wavelength band to be detected by the photoelectric conversion devices overlain by the filter.