Optics: image projectors – Distortion compensation – For projection axis inclined to screen
Reexamination Certificate
2006-11-07
2006-11-07
Perkey, W.B. (Department: 2851)
Optics: image projectors
Distortion compensation
For projection axis inclined to screen
C353S069000, C348S746000, C348S747000, C348S806000
Reexamination Certificate
active
07131732
ABSTRACT:
In a projector to which the present invention is applied, a distance sensor measures distances between the projector and a plurality of points on a screen. An angle calculation unit obtains a formula representing a screen surface, based on plural pieces of distance data representing results of measurement by the distance sensor, and obtains inclination angles θVand θHof the screen with respect to the light axis of a projection light. The angle calculation unit supplies the obtained inclination angles θVand θHto a trapezoidal correction unit. The trapezoidal correction unit performs trapezoidal correction by using the supplied inclination angles θVand θH.
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U.S. Appl. No. 10/866, 299, filed Jun. 10, 2004, Inventor: M. Ogawa; Title: Projector With Tilt-Angle Detecting Capability.
Casio Computer Co. Ltd.
Cruz Magda
Frishauf Holtz Goodman & Chick P.C.
Perkey W.B.
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