Provided is an image processing system, including a depth calculating section that calculates a depth of an object from a surface of a body, the object existing inside the body; a light receiving section that receives light from the object; and a substance amount calculating section that calculates an amount of a substance, which generates the light received by the light receiving section, inside the object based on the depth of the object calculated by the depth calculating section and an amount of light received by the light receiving section.