Imaging device provided with light source that emits pulsed light and image sensor

An imaging apparatus for acquiring spectral separation images comprising:

• an optical filter;
• an image sensor including a first pixel and a second pixel and capturing an image;
• and
• a signal processing circuit that is configured to perform separating the image captured by the image sensor into the spectral separation images using a compressed sensing algorithm, wherein
• the optical filter includes filter regions arrayed two-dimensionally,
• the filter regions include a first region and a second region,
• a wavelength distribution of an optical transmittance of the first region has a first local maximum in a first wavelength band and a second local maximum in a second wavelength band that differs from the first wavelength band,
• a wavelength distribution of an optical transmittance of the second region has a third local maximum in a third wavelength band and a fourth local maximum in a fourth wavelength band that differs from the third wavelength band,
• the third wavelength band differs from both the first wavelength band and the second wavelength band,
• the first pixel receives light of the first wavelength band which has passed through the first region and light of the second wavelength band which has passed through the first region, and
• the second pixel receives light of the third wavelength band which has passed through the second region and light of the fourth wavelength band which has passed through the second region.