Imaging device

An imaging device, comprising:

• a light source spectral sensor that includes a plurality of band-pass filters and a plurality of photodiodes, wherein
• a photodiode of the plurality of photodiodes is on a corresponding band-pass filter of the plurality of band-pass filters, and
• the light source spectral sensor is configured to obtain a wavelength spectrum, for light from a light source for illumination of a measurement target, to detect light for each wavelength;
• a multispectral camera that includes a plurality of on-chip filters and a plurality of image sensors, wherein
• an on-chip filter of the plurality of on-chip filters is in a corresponding image sensor of the plurality of image sensors,
• the multispectral camera is configured to perform a wavelength spectral imaging operation of the measurement target, and
• the wavelength spectrum has more wavelengths than a spectrum of the multispectral camera;
• and
• a central processing unit (CPU) configured to:
• calculate spectral reflectance of the measurement target, based on a spectrum detection result and a wavelength spectral image, wherein
• the spectrum detection result is associated with the light source,
• the light source spectral sensor is further configured to obtain the spectrum detection result, and
• the multispectral camera is further configured to capture the wavelength spectral image;
• identify an incidence angle, of the light from the light source for each of portions of the wavelength spectral image, based on information indicating a direction where the light source is located,
• identify a reflection angle of each of the portions of the wavelength spectral image, based on the wavelength spectral image;
• and
• correct the spectral reflectance, for each of the portions of the wavelength spectral image, based on
• direction dependence reflection mode information associated with the measurement target,
• the incidence angle identified for each of the portions of the wavelength spectral image, and
• the reflection angle identified for each of the portions of the wavelength spectral image.