An image processing system comprising: a first light projection unit configured to project, onto an object, a light pattern for specifying a three-dimensional shape; a second light projection unit configured to project, onto the object, substantially uniform light in which illumination energy is substantially uniform in a cross-sectional direction relative to a light projection direction, the second light projection unit projecting the substantially uniform light at substantially the same angle as in projection performed by the first light projection unit; a first light projection control unit configured to control projection of the light pattern onto the object by the first light projection unit; a second light projection control unit configured to control projection of the substantially uniform light onto the object by the second light projection unit; an image capturing unit configured to capture an image of the object; an image capturing control unit configured to control image capturing performed by the image capturing unit; a first captured image recording unit configured to record a first captured image that is captured by the image capturing unit in a state where the first light projection control unit performs control such that the light pattern is projected and the second light projection control unit performs control such that the substantially uniform light is not projected; a second captured image recording unit configured to record a second captured image that is captured by the image capturing unit in a state where the first light projection control unit performs control such that the light pattern is not projected and the second light projection control unit performs control such that the substantially uniform light is projected; a generation unit configured to generate a division image by dividing components of the first captured image by components of the second captured image; and a calculation unit configured to calculate a three-dimensional position on the object with use of the division image, characterized in that an exposure time of the image capturing unit when capturing the second captured image is shorter than an exposure time of the image capturing unit when capturing the first captured image, so as to bring the luminance values of the first captured image and the luminance values of the second captured image closer to each other. a first light projection unit configured to project, onto an object, a light pattern for specifying a three-dimensional shape; a second light projection unit configured to project, onto the object, substantially uniform light in which illumination energy is substantially uniform in a cross-sectional direction relative to a light projection direction, the second light projection unit projecting the substantially uniform light at substantially the same angle as in projection performed by the first light projection unit; a first light projection control unit configured to control projection of the light pattern onto the object by the first light projection unit; a second light projection control unit configured to control projection of the substantially uniform light onto the object by the second light projection unit; an image capturing unit configured to capture an image of the object; an image capturing control unit configured to control image capturing performed by the image capturing unit; a first captured image recording unit configured to record a first captured image that is captured by the image capturing unit in a state where the first light projection control unit performs control such that the light pattern is projected and the second light projection control unit performs control such that the substantially uniform light is not projected; a second captured image recording unit configured to record a second captured image that is captured by the image capturing unit in a state where the first light projection control unit performs control such that the light pattern is not projected and the second light projection control unit performs control such that the substantially uniform light is projected; a generation unit configured to generate a division image by dividing components of the first captured image by components of the second captured image; and a calculation unit configured to calculate a three-dimensional position on the object with use of the division image, characterized in that an exposure time of the image capturing unit when capturing the second captured image is shorter than an exposure time of the image capturing unit when capturing the first captured image, so as to bring the luminance values of the first captured image and the luminance values of the second captured image closer to each other.