Patent ID: 6997563

Claim:
An apparatus, comprising: an image projector to project an image; a set of inherent parameters including a horizontal resolution Wn 0 , a vertical resolution Hn 0 , a depth d, and a vertical offset db; a receiver to receive a vertical tilt angle βv and a horizontal tilt angle βh; and a corrector to compute keystone correction corner points for the image using the set of inherent parameters, the vertical tilt angle βv, and the horizontal tilt angle βh using formulae xp ⁡ [ x , y ] = cos ⁡ [ β ⁢ ⁢ h ] × x 1 + sin ⁡ [ β ⁢ ⁢ v ] × y + cos ⁡ [ β ⁢ ⁢ v ] × sin ⁡ [ β ⁢ ⁢ h ] × x d ⁢ ⁢ and yp ⁡ [ x , y ] = cos ⁡ [ β ⁢ ⁢ v ] × y - sin ⁡ [ β ⁢ ⁢ h ] × sin ⁡ [ β ⁢ ⁢ v ] × x - ( db - Hn 0 2 ) 1 + sin ⁡ [ β ⁢ ⁢ v ] × y + cos ⁡ [ β ⁢ ⁢ v ] × sin ⁡ [ β ⁢ ⁢ h ] × x d 6 + ( db - Hn 0 2 ) , where ⁢ ⁢ x ⁢ ⁢ and ⁢ ⁢ y represent an uncorrected pixel location and xp and yp represent a corrected pixel location.