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US 6,148,120 AGranted
Warping of focal images to correct correspondence error
AssigneeCognex Corporation
InventorMichael Sussman
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Abstract
The invention corrects correspondence error among multiple images taken at different focal distances with non-telecentric optical systems, and is particularly useful in focal gradient analysis range imaging systems.
Claims10
A method for obtaining a range image using depth from focal gradient analysis, the method including:
- acquiring a near reflectance image;
- using a focus operator to obtain a near focal image;
- acquiring a farther reflectance image;
- using a focus operator to obtain a farther focal image;
- warping the farther focal image so as to decrease correspondence error of the farther focal image with respect to the near focal image, thereby providing a warped farther focal image;
- and
- range normalizing the near focal image and the warped farther focal image so as to provide a range image.
4 more elements
Dependencies are inferred from the claim text.