Image Correction and In Situ Spectral Calibration for Low-Cost, Smartphone Hyperspectral Imaging

Developments in the portability of low-cost hyperspectral imaging instruments translate to significant benefits to agricultural industries and environmental monitoring applications. These advances can be further explicated by removing the need for complex post-processing and calibration. We propose...

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Bibliographic Details
Published in:Remote sensing (Basel, Switzerland) Switzerland), 2022-03, Vol.14 (5), p.1152
Main Authors: Davies, Matthew, Stuart, Mary B., Hobbs, Matthew J., McGonigle, Andrew J. S., Willmott, Jon R.
Format: Article
Language:English
Subjects:
Agricultural economics
Agricultural industry
Bias
Calibration
Cameras
Environmental monitoring
field deployable
hyperspectral
Hyperspectral imaging
Low cost
portable
Quality control
Remote sensing
Scanners
Sensors
smartphone
Smartphones
Spectra
Spectral reflectance
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Summary:Developments in the portability of low-cost hyperspectral imaging instruments translate to significant benefits to agricultural industries and environmental monitoring applications. These advances can be further explicated by removing the need for complex post-processing and calibration. We propose a method for substantially increasing the utility of portable hyperspectral imaging. Vertical and horizontal spatial distortions introduced into images by ‘operator shake’ are corrected by an in-scene reference card with two spatial references. In situ light-source-independent spectral calibration is performed. This is achieved by a comparison of the ground-truth spectral reflectance of an in-scene red–green–blue target to the uncalibrated output of the hyperspectral data. Finally, bias introduced into the hyperspectral images due to the non-flat spectral output of the illumination is removed. This allows for low-skilled operation of a truly handheld, low-cost hyperspectral imager for agriculture, environmental monitoring, or other visible hyperspectral imaging applications.
ISSN:2072-4292
2072-4292
DOI:10.3390/rs14051152