Optics: measuring and testing – Position or displacement
Reexamination Certificate
2007-06-28
2010-10-12
Chowdhury, Tarifur (Department: 2886)
Optics: measuring and testing
Position or displacement
C356S404000
Reexamination Certificate
active
07812971
ABSTRACT:
An autofocus system and method that includes a controllable light source having at least two selectively activated substantially monochromatic output wavelengths adapted for illuminating an object; a camera receiving light from said light source reflected from a portion of said object and generating output signals responsive to said received light; a controller connected to said camera and said controllable light source for positioning said camera and sequentially illuminating a first portion of the object with at least two selectively activated substantially monochromatic output wavelengths, moving the camera to a second position and sequentially illuminating a second portion of the object with at least two selectively activated substantially monochromatic output wavelengths; and a data processor connected to said camera and receiving said output signals and for each portion, comparing the output signals associated with each wavelength and determining a focus parameter from said comparison.
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International Search Report and Written Opinion for corresponding International Application No. PCT/US2008/068483.
Jackson Robert L.
Polidor Edward T.
Chowdhury Tarifur
Harter Secrest & Emery LLP
Pajoohi Tara S
Quality Vision International, Inc.
Salai Stephen B.
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