System and method for correcting luminance non-uniformity of...

Details System and method for correcting luminance non-uniformity of... System and method for correcting luminance non-uniformity of...

2006-03-28

2006-03-28

Perkey, W. B. (Department: 2851)

Optics: image projectors

Distortion compensation

C353S121000, C353S122000, C348S744000, C345S698000, C345S596000, C358S003130, C382S275000

Reexamination Certificate

active

07018050

ABSTRACT:
A system and method corrects luminance non-uniformity caused by images being obliquely projected onto a screen. A camera is used to record the geometry of the obliquely displayed image. Utilizing this recorded geometry, a homography is then derived that maps pixels between the projector's coordinate system and the screen's coordinate system. Utilizing the homography, the projector pixel that attends to the largest projected area on the screen is identified. Next, the ratio of each pixel's projected area to the largest projected area is computed. These ratios are then organized into an attenuation array that is used to produce “corrected” luminance information from input image data. The projector is then driven with the “corrected” luminance information.

REFERENCES:
patent: 6483537 (2002-11-01), Mayer et al.
patent: 6520647 (2003-02-01), Raskar
patent: 6816187 (2004-11-01), Iwai et al.
patent: 6817721 (2004-11-01), Ulichney et al.
patent: 6921172 (2005-07-01), Ulichney et al.
patent: 2004/0061838 (2004-04-01), Mochizuki et al.
patent: 2004/0141157 (2004-07-01), Ramachandran et al.

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