Image processing apparatus which determines category to which object in image belongs, method therefor, and object discrimination apparatus

A method for an image processing apparatus, the method comprising:

• imaging a target object using signals in different predetermined wavelength bands in which a spectral transmittance of a specific type of substance, among a plurality of types of substances, on a surface of the target object is different from spectral transmittances of other types of substances of the plurality of types of substances;
• determining locations and sizes of the specific type of substance on the surface of the target object based on a result of calculation using a plurality of images captured by the imaging using the signals in the different wavelength bands;
• and
• discriminating a class to which the target object belongs based on a distribution state of the determined locations and sizes of the specific type of substance on the surface of the target object.

A non-transitory computer-readable storage medium storing a program to cause a computer to perform a method for an image processing apparatus, the method comprising:

• imaging a target object using signals in different predetermined wavelength bands in which a spectral transmittance of a specific type of substance, among a plurality of types of substances, on a surface of the target object is different from spectral transmittances of other types of substances of the plurality of types of substances;
• determining locations and sizes of the specific type of substance on the surface of the target object based on a result of calculation using a plurality of images captured by the imaging using the signals in the different wavelength bands;
• and
• discriminating a class to which the target object belongs based on a distribution state of the determined locations and sizes of the specific type of substance on the surface of the target object.