Optics: image projectors – Distortion compensation – For projection axis inclined to screen
Reexamination Certificate
2007-12-04
2007-12-04
Dowling, William C. (Department: 2851)
Optics: image projectors
Distortion compensation
For projection axis inclined to screen
Reexamination Certificate
active
10899643
ABSTRACT:
A trapezoidal correction unit included in a projector positions a quadrangle p′q′r′s′ after correction within a quadrangle pqrs before correction, by using inclination angles v and h. In this case, the trapezoidal correction unit performs correction in a manner that the quadrangle p′q′r′s′ establishes symmetry with respect to a vertical line including a light axis point k which is an intersection of a light axis and a screen, and a part or the all of the bottom side of the quadrangle p′q′r′s′ contacts or is positioned near a part or the all of the bottom side of the quadrangle pqrs. The trapezoidal correction unit sets the size of the quadrangle p′q′r′s′ in a manner that the area of the quadrangle p′q′r′s′ becomes the largest. The trapezoidal correction unit projectively transforms the quadrangle pqrs before correction represented by an input image signal into the quadrangle p′q′r′s′ after correction temporally continuously.
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Casio Computer Co. Ltd.
Dowling William C.
Frishauf Holtz Goodman & Chick P.C.
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