Optics: image projectors – Distortion compensation
Reexamination Certificate
2006-02-14
2009-10-13
Dowling, William C (Department: 2851)
Optics: image projectors
Distortion compensation
C348S188000
Reexamination Certificate
active
07600875
ABSTRACT:
In a projector, CPU supplies a chart generation circuit with chart display information designating display position and display size of a chart image to be projected on a screen such that it comes within viewable ranges of phase difference sensors. For focus control, CPU sets display position near center of the screen, and designates display size regardless of distance between the projector and screen. For keystone correction, CPU designates display position and display size based on relationship among angular field of view, distance, and viewable ranges of the phase difference sensors. A superimposing circuit generates a video by superimposing a video signal with a chart image signal based on the chart display information. A display device projects the video superimposed by the superimposing circuit on the screen. CPU obtains the distance to the screen based on phase difference between reflection lights obtained by a sensor unit and corrects the video.
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Japanese Office Action dated Mar. 31, 2009 (7 pages), and English translation thereof (8 pages), issued in counterpart Japanese Application Serial No. 2005-038262.
Casio Computer Co. Ltd.
Dowling William C
Frishauf Holtz Goodman & Chick P.C.
Owens Danell L
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