1. A robot system, comprising: a robot having a movable section; an image capture unit provided on the movable section; an output unit that allows the image capture unit to capture a target object and a reference mark and outputs a captured image in which the reference mark is imaged as a locus image; an extraction unit that extracts the locus image from the captured image; an image acquisition unit that performs image transformation on the basis of the extracted locus image by using the point spread function so as to acquire an image after the transformation from the captured image; a computation unit that computes a position of the target object on the basis of the acquired image; and a control unit that controls the robot so as to move the movable section toward the target object in accordance with the computed position.