Image projection systems

Details Image projection systems Image projection systems

2006-02-14

2006-02-14

Wallerson, Mark (Department: 2622)

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

C358S531000, C348S246000, C348S247000, C382S190000, C382S195000, C382S203000

Reexamination Certificate

active

06999205

ABSTRACT:
A method of determining the location of an optical feature in an image projection system, the method comprising:1) projecting a first image of the feature onto a detector with a lens in a first position;2) sensing, with the detector, the position of the first image of the feature;3) projecting a second image of the feature onto a detector with a lens in a second position laterally spaced from the first position;4) sensing, with the detector, the position of the second image of the feature; and5) deducing the location of the defect from the difference between the positions sensed in steps 2) and 4).

REFERENCES:
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patent: 4675533 (1987-06-01), Shimizu
patent: 4691365 (1987-09-01), Nagashima
patent: 4827351 (1989-05-01), Sakamoto
patent: 5015070 (1991-05-01), Montgomery et al.
patent: 5214470 (1993-05-01), Denber
patent: 5967982 (1999-10-01), Barnett

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