Patent ID: 8425050
Filing Date: 2013-04-23
Classification: G03B,H04N

Abstract:
1. A projection display device comprising: a projection section having an optical system capable of zooming a projection image to be projected on a projection surface, and adapted to project an image; a parameter obtaining section adapted to obtain a first parameter corresponding to the projection angle showing a relative posture of the projection display device to the projection surface; a vanishing point calculation section adapted to calculate a position of a vanishing point in displaying the image by projection on the projection surface with the projection angle, based on the first parameter; an actual zoom ratio obtaining section adapted to obtain an actual zoom ratio at which the projection section actually displays the image by projection on the projection surface; a parameter calculating section adapted to correct the first parameter based on a fixed reference zoom ratio and the actual zoom ratio to calculate a second parameter; and a keystone correction section adapted to perform a keystone correction of the image based on the fixed reference zoom ratio and the second parameter.