Filter array and imaging system

A filter array comprising:

• optical filters that are arranged in two dimensions, wherein
• the optical filters include a first filter and a second filter,
• the first filter includes
• a first multimode filter that has, within a target wavelength range, first peak wavelengths at each of which an optical transmittance is at a local maximum, and
• a first band-limiting filter that restricts transmission of light in a first sub-wavelength range that is a part of the target wavelength range, and
• the second filter includes
• a second multimode filter that has, within the target wavelength range, second peak wavelengths at each of which an optical transmittance is at a local maximum, at least one of the second peak wavelengths being different from the first peak wavelengths, and
• a second band-limiting filter that restricts transmission of light in a second sub-wavelength range that is a part of the target wavelength range and that is different from the first sub-wavelength range,
• first transmitted light that has passed through the first multimode filter and the first band-limiting filter has at least two peak wavelengths in the target wavelength range, and
• second transmitted light that has passed through the second multimode filter and the second band-limiting filter has at least two peak wavelengths in the target wavelength range.