To provide an image processing system that makes it easy to adjust the position and posture of a camera or the like, the image processing system includes an image acquisition unit configured to acquire an image signal formed by an imaging unit that captures an optical image having a low-distortion region and a high-distortion region, a characteristics information acquisition unit configured to acquire characteristics information regarding characteristics of the optical image, and a display signal generation unit configured to form information indicating a boundary between the low-distortion region and the high-distortion region based on the characteristics information acquired by the characteristics information acquisition unit, and generate a display signal for superimposing the information indicating the boundary on the image signal.