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Calibration and Correction for Non-Uniform Pixel Sensitivity in Digital NIR Imaging

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

Citation:  Paper number  MBSK 06-108,  ASABE/CSBE North Central Intersectional Meeting . (doi: 10.13031/2013.22359) @2006
Authors:   Jason Morrison, Wenbo Wang, Jitendra Paliwal
Keywords:   Near infrared hyperspectral imaging, focal plane arrays, pixel sensitivity

Digital near infrared (NIR) imaging of biological subjects is an increasingly important aspect of food quality inspection and bio-security in general. Digital NIR sensors, usually focal plane arrays, are known to have non-uniform sensitivity from pixel to pixel arising from detector manufacturing issues, operational conditions and design limitations. This study reviews the fundamentals for non-uniform pixel sensitivity and subsequently describes and tests a methodology for correcting such non-uniformities. The methodology assumes linear pixel sensitivity and employs a statistical analysis to distinguish between signal variation and pixel sensitivity. The system used to test the methodology employs a liquid crystal tunable filter (LCTF) based hyperspectral NIR imaging system capable of automatically acquiring a hyperspectral data cube in the 900 - 1700 nm range. Preliminary testing indicates promising results.

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