Patent ID: 8773529
Filing Date: 2014-07-08
Classification: G03B,H04N

Abstract:
1. A projector for imaging an original image on a projection area comprising: projection optics having an adjustable focus for receiving the original image and projecting an image of the original image to provide a projected image on the projection area; a camera device for imaging the projection area and generating a projection area image; a comparison device for comparing the original image as provided to the projection optics with the projection area image and adjusting the focus of the projection optics as a function of the comparison such that the comparison device is configured to determine the position of the projected image of the original image in the projection area image; and wherein the position of the projected image of the original image in the projection area image is used as a measure for determining a projection distance corresponding to a distance between the projector and the projection area and thereby adjusting the focus of the projection optics.