Optical distortion calibration for electro-optical sensors

Details Optical distortion calibration for electro-optical sensors Optical distortion calibration for electro-optical sensors

2011-04-05

2011-04-05

Nghiem, Michael P (Department: 2857)

Data processing: measuring, calibrating, or testing

Calibration or correction system

Position measurement

C702S094000, C702S104000

Reexamination Certificate

active

07920982

ABSTRACT:
Optical distortion calibration for an Electro-Optical sensor in a chamber eliminates calibration of the mirror controller and allows for calibration while the target is in motion across the FOV thus providing a more efficient and accurate calibration. A target pattern is projected through sensor optics with line of sight motion across the sensor FOV to generate a sequence of frames. Knowing that the true distances between the same targets remain constant with line of sight motion across the sensor's FOV, coefficients of a function F representative of the non-linear distortion in the sensor optics are fit from observed target positions in a subset of frames to true line of sight so that distances between targets are preserved as the pattern moves across the FOV. The coefficients are stored as calibration terms with the sensor.

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