Method and apparatus for automatic keystone correction

The present invention provides automatic correction of any distortions produced when computer projection displays are misaligned with respect to the projection surface (such as keystoning). Although sophisticated LCD projectors now offer partial solutions to this problem, they require specialized ha...

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Bibliographic Details
Main Authors MULLIN MATTHEW, SUKTHANKAR RAHUL, STOCKTON ROBERT
Format Patent
LanguageEnglish
Published 22.06.2004
Edition7
Subjects
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
PICTORIAL COMMUNICATION, e.g. TELEVISION
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Summary:The present invention provides automatic correction of any distortions produced when computer projection displays are misaligned with respect to the projection surface (such as keystoning). Although sophisticated LCD projectors now offer partial solutions to this problem, they require specialized hardware and time-consuming manual adjustment. The two key concepts in the present invention are: (1) using an uncalibrated camera to observe the projected image; and (2) the image to be displayed is pre-warped so that the distortions induced by the misaligned projection system will exactly undo the distortion. The result is that an arbitrarily mounted projector (in an unknown orientation) still displays a perfectly aligned and rectilinear image.
Bibliography:Application Number: US20000712599