A non-transitory computer readable medium storing an image processing program causing a computer to execute image processing, the image processing program causing the computer to execute: a person storage step of storing a person region that is a region that includes a person detected in a frame image and is smaller than the frame image; an image acquisition step of acquiring the frame image from a moving image; a detection region setting step of setting a detection region that is a region based on the person region stored in the person storage step in the frame image acquired in the image acquisition step; and a person detection step of detecting the person from the detection region set in the detection region setting step.