System for correcting approximate expressions used in...

Details System for correcting approximate expressions used in... System for correcting approximate expressions used in...

2006-09-12

2006-09-12

Perkey, W. B. (Department: 2851)

Optics: image projectors

Distortion compensation

C353S070000, C348S746000

Reexamination Certificate

active

07104653

ABSTRACT:
A computer calculates the shape of a figure after transformation using an approximate expression previously set for correcting a projected image for distortion associated with the shape of a projection surface of a cylindrical screen (an equation representative of a parabola in this case), a variable for horizontal transformation and a variable for vertical transformation which are entered through a user interface for transforming the approximate expression, and/or a variety of parameters required for transformation of image and optical corrections such as the optical center, linearity, amplitude, and position. A projector scales up or down pixels to produce a transformed image from the calculated figure after transformation for projection onto the cylindrical screen.

REFERENCES:
patent: 6431711 (2002-08-01), Pinhanez
patent: 6834965 (2004-12-01), Raskar et al.
patent: 2003/0098957 (2003-05-01), Haldiman
patent: 2004/0184013 (2004-09-01), Raskar et al.
patent: 2001-169211 (2001-06-01), None
patent: 2002-14611 (2002-01-01), None
patent: 2003-85586 (2003-03-01), None
Least Squares Fitting, mathworld.wolfram.com: http://mathworld.wolfram.com/LeastSquaresFitting.html, printed on Mar. 17, 2006.

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