Patent ID: 8610778

Claim:
A method for use in calibrating a projector image display towards a display screen, comprising, a) providing the display screen with a plurality of discrete light detection points that are located on or in the display screen to represent and act as sensing points of the display screen to sense light on the display screen, b) projecting at least one image towards the display screen, c) arranging each light detection point or groups thereof to be associated with and physically connected to a light detector; and wherein the method further comprises one of: d) measuring and determining the image pixel or pixels of the projected image which hit the respective detection point on the screen, e) physically shifting the projector by adjusting the physical position of the projector with respect to at least one of: lateral direction, vertical direction, orientation and distance to the screen, by simultaneously correlating measured image pixel information at the detection points with theoretical image pixel information for these detection points until the measurement deviation has been minimised as a consequence of said adjustment; and subsequently fixing the position of the projector; and f) correlating brightness and/or colours in the projected image by comparing measurements at the detection points; and adjusting relevant projection parameters or image parameters correspondingly.