1. A projector device, comprising: a projection image generation device that projects an image selected as a projection subject and a calibration image generated by superimposing a predetermined calibration pattern of predetermined configuration upon a part of the image selected as the projection subject upon a projection surface; a photographic device that photographs the projected calibration image; and a calibration control device that repeatedly executes calibration operation for adjusting appearances of the projection images on the projection surface during projection of the projection images, based upon the pattern of predetermined configuration included in the projected calibration image which is acquired by photography by the photographic device, wherein: the projection image generation device projects the calibration image for a predetermined short time period between intervals of time during which the image selected as the projection subject is projected; and the photographic device photographs the projected calibration image in synchronization with projection timing of the calibration image.