American Society of Agricultural and Biological Engineers

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Calibration of Imaging Spectrometry System for Inspection of Contaminated Poultry Carcasses

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  Paper number  013129,  2001 ASAE Annual Meeting. (doi: 10.13031/2013.7432) @2001
Authors:   Kurt C. Lawrence, Bosoon Park, William R. Windham, Chengye Mao
Keywords:   hyperspectral imaging system, imaging spectrometry, spectroscopy, spectrometer, imaging calibration, percent reflectance the word

A method to calibrate a hyperspectral imaging system had been demonstrated. The method consists of a modified geometric control point correction to remove smile and keystone effect from the system and applying both wavelength and distance calibrations to reduce the wavelength and distance errors to less than 1 pixel value. Next, a pixel-by-pixel percent reflectance calibration was performed at all wavelengths with dark current and 99% reflectance calibration-panel measurements, and results were verified with measurements on a certified gradient Spectralon panel with nominal values ranging from 12% to 99%. Results indicate the system is capable of calibrating the hyperspectral system across the entire spectral range of the detector, but errors increase significantly below 420 nm and above 840 nm. Further research should be performed to evaluate the stability of the calibration over time, and techniques must be developed to implement the calibration for real-time analysis.

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