Filter array and light detection system

A light detection system comprising:

• a filter array, the filter array including filters that are disposed in a two-dimensional plane and that have transmission spectra different from each other;
• an image sensor that is disposed at a position where the image sensor receives light transmitted through the filters;
• and
• a processing circuit that generates sets of spectral image data corresponding one-to-one to wavelength bands based on data indicating a spatial distribution of the transmission spectra of the filters and image data acquired by the image sensor,
• wherein the filters include
• a first filter that has a transmission spectrum having a first peak group including a first major peak and a second major peak that are adjacent to each other,
• at least one second filter that has a transmission spectrum having a second peak group including a third major peak and a fourth major peak that are adjacent to each other, and
• a third filter that has a transmission spectrum having a fifth major peak and a sixth major peak that are adjacent to each other,
• wherein, of major peaks included in the second peak group, the third major peak has a wavelength that is closest to a wavelength at the first major peak,
• wherein a first interval between the wavelength at the first major peak and a wavelength at the second major peak is different from a second interval between the wavelength at the third major peak and a wavelength at the fourth major peak,
• wherein ΔFSR/σ>0.25, where ΔFSR denotes an absolute value of a difference between the first interval and the second interval and σ denotes a half-width of the first major peak, the half-width of the first major peak representing a wavelength difference between wavelengths corresponding to half of a transmittance at the first major peak,
• wherein the transmission spectrum of the third filter is different from the transmission spectrum of the first filter,
• wherein a third interval between a wavelength at the fifth major peak and a wavelength at the sixth major peak is same as the first interval,
• wherein each of the sets of the spectral image data includes n pixel values in a horizontal direction and m pixel values in a vertical direction,
• wherein a number of the wavelength bands is w, and
• wherein the data indicating the spatial distribution of the transmission spectra of the filters corresponds to H being a matrix of num rows and n×m×w columns.