PROJECTION SYSTEM, CONTROL PROGRAM, CONTROL DEVICE, AND CONTROL METHOD

PROBLEM TO BE SOLVED: To improve the detection accuracy of a user operation to a projection device.SOLUTION: A projection part projects a projection image onto a projection surface. An imaging part images an imaging area, to generate a captured image. An image detection part detects a coincident image indicating an image in the projection image which is coincident with an operation target image. A first coordinate calculation part calculates a first coordinate for specifying the position of the imaging area with respect to the projection image. A second coordinate calculation part calculates a second coordinate for specifying the position of the coincident image with respect to the projection image. A movement information calculation part calculates movement information for moving the imaging area, from the first coordinate and the second coordinate. An imaging control part controls imaging by the imaging part, so as to move the imaging area, according to the movement information. An operation detection part detects the user operation to the coincident image. A projection control part generates the projection image and controls projection by the projection part.