A projection system includes an imaging unit, a projector, a distance detector, and a controller. The imaging unit captures an image of an object. The projector generates a projection image based on the captured image to project the projection image onto the object. The distance detector detects a distance to the object. The controller controls operations of the imaging unit and the projector. The controller determines whether the distance detected by the distance detector falls within a predetermined interval range. When the detected distance falls within the predetermined interval range, the controller causes the projector to project the projection image onto the object based on the captured image.
