Photography – Having variable focal length of camera objective – Having focus operation
Reexamination Certificate
2010-03-04
2011-11-22
Mahoney, Christ (Department: 2862)
Photography
Having variable focal length of camera objective
Having focus operation
C348S356000
Reexamination Certificate
active
08064761
ABSTRACT:
An image is focused onto an image sensor array by efficient movement of an adjustable focus lens by a lens focus motor. A minimum of three focus positions is required to determine an estimated best focus position of the lens focus motor. After which a sweep of the focus positions surrounding the estimated best focus position is performed to verify and determine the best actual focus position of the lens focus motor. A sharpness value of the image being focused comprising a Sobel edge detection or other detections means provide sharpness data to evaluate image sharpness at various lens focus motor positions.
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Co-Pending, U.S. Appl. No. 12/660,560, filed Mar. 1, 2010, “A Method to Perform Sobel Calculations and Normalization for Auto-focus in a Digital Camera,” assigned to the same assignee as the current invention.
Ackerman Stephen B.
Chang Fang-Chi
Digital Imaging Systems GmbH
Mahoney Christ
Saile Ackerman LLC
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