GRADIENT CHANGE DETECTION SYSTEM, DISPLAY SYSTEM USING SAME, AND PROGRAM FOR MOVING BODY

A display system includes a display processing device (30) that controls display of an image, a posture detection unit (40) that detects a posture change amount in a rotation direction about a left-right direction with respect to a traveling direction of a moving body, a displacement amount calculator (52a), a correction processing device (50) including a correction amount calculator (52b) that calculates a correction amount of a display position of the image based on the posture change amount, and a gradient change detector (52c) that detects a change in a gradient of the traveling path based on the posture change amount or a variation amount in predetermined unit time of the posture change amount. The correction processing device (50) adjusts the correction amount based on a detection result of the gradient change detector (52c).