Robust field of view distortion calibration

Details Robust field of view distortion calibration Robust field of view distortion calibration

2006-03-31

2010-02-02

Chan, Jason (Department: 2622)

Television

Monitoring, testing, or measuring

Testing of camera

C348S188000, C348S207100, C348S208990, C348S208700, C348S335000, C348S086000, C348S087000, C382S291000, C358S003260

Reexamination Certificate

active

07656425

ABSTRACT:
A method characterizes field of view (FOV) distortion and may correct machine vision measurements accordingly. A plurality of distorted images are acquired, with the same calibration target at a plurality of spaced-apart locations within the FOV. The method analyzes the images and determines distortion parameters that can correct the distortions in the images such that features included in the calibration target pattern achieve a sufficient or optimum degree of congruence between the various images. Distortion parameters may be determined for each optical configuration (e.g., lens combination, magnification, etc.) that is used by a machine vision inspection system. The distortion parameters may then be used to correct FOV distortion errors in subsequent inspection and measurement operations.

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