1. An image processing system comprising: an image acquisition section that consecutively acquires still images; a direction determination section that determines a camera moving direction, the camera moving direction being a moving direction of an imaging section during capture; a slit image generation section that generates slit images based on the consecutively acquired still images; and a panoramic image generation section that performs a synthesis process of the slit images to generate a panoramic image, the direction determination section determining whether the camera moving direction is a first camera moving direction or a second camera moving direction that differs from the first camera moving direction when the imaging section is moved during capture, and the panoramic image generation section determining a synthesis position of a slit image among the slit images based on the camera moving direction when the consecutively acquired still images were captured, and performing the synthesis process of the slit image to generate the panoramic image.