Keystone correction derived from the parameters of projectors

Optics: image projectors – Distortion compensation – For projection axis inclined to screen

Reexamination Certificate

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Reexamination Certificate

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06997563

ABSTRACT:
A projector determines horizontal and vertical tilt angles. Using the tilt angles and the inherent properties of the projector, keystone correction corner points for the image can be computed. The keystone correction corner points can be used to perform keystone correction on the image.

REFERENCES:
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patent: 6367933 (2002-04-01), Chen et al.
patent: 6520547 (2003-02-01), Robinson
patent: 6592228 (2003-07-01), Kawashima et al.
patent: 6611260 (2003-08-01), Greenberg et al.
patent: 6686973 (2004-02-01), Su
patent: 6846081 (2005-01-01), Mochizuki et al.
patent: 2004/0036844 (2004-02-01), Wood et al.

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