Laboratory spectral calibration and radiometric calibration of hyper-spectral imaging spectrometer

Yu, Xin-guang; Sun, Yanhua; Fang, Aiping; Qi, Weijun; Liu, Caijuan

doi:10.1109/icsai.2014.7009407

Cited by 16 publications

(11 citation statements)

References 7 publications

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“…The second limitation is that of calibration drift. Calibration of such systems is generally performed using known spectral sources such as a xenon, mercury or sodium lamp [31,32]. Spectral features can be identified from instrument output, and these are used to establish the range and resolution of the instrument.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2022

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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.

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Section: Introductionmentioning

confidence: 99%

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

et al. 2022

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“…The goal of radiometric calibration is to correctly convert the raw data from sensor count to spectral radiance so that the measurements are comparable to data from other instruments. As radiometric calibration relies on the wavelength calibration [8], the wavelength calibration must be performed first.…”

Section: Radiometric Calibrationmentioning

confidence: 99%

Real-Time Corrections for a Low-Cost Hyperspectral Instrument

Henriksen

Garrett

Prentice

et al. 2019

2019 10th Workshop on Hyperspectral Imaging and Signal Processing: Evolution in Remote Sensing (WHISPERS)

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The development of a hyperspectral imager (HSI) made from commercial off-the-shelf (COTS) parts enables the use of hyperspectral imaging on smaller low-cost platforms such as cubesats, drones, or other autonomous vehicles. However, HSIs built from COTS parts often suffer from more pronounced optical distortions, such as 'smile' and 'keystone', due to the shifted balance between cost and image quality. In this proceeding, radiometric, spectral, and geometric calibrations of a COTS HSI are presented. Furthermore, the calibrations are used to develop a real-time software-based spectrogram correction. The corrections will enhance the capability of small, autonomous platforms in using hyperspectral imaging.

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“…By changing the wavelength of the monochromatic collimation light each time, the spectral response curve of each channel is acquired (Figure 8). The SRF can be well-approximated by a Gaussian function with appropriate parameters as in Equation (1) [23]. SRF(λ)=A0+A1exp[−(λ−λ0)22σ2] where λ0 is the center wavelength and full width at half maximum (FWHM) is calculated as FWHM=22ln2σ.…”

Section: Laboratory Calibrationmentioning

confidence: 99%

Wide Swath and High Resolution Airborne HyperSpectral Imaging System and Flight Validation

Zhang

Yuan

Wang

et al. 2019

Sensors

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Wide Swath and High Resolution Airborne Pushbroom Hyperspectral Imager (WiSHiRaPHI) is the new-generation airborne hyperspectral imager instrument of China, aimed at acquiring accurate spectral curve of target on the ground with both high spatial resolution and high spectral resolution. The spectral sampling interval of WiSHiRaPHI is 2.4 nm and the spectral resolution is 3.5 nm (FWHM), integrating 256 channels coving from 400 nm to 1000 nm. The instrument has a 40-degree field of view (FOV), 0.125 mrad instantaneous field of view (IFOV) and can work in high spectral resolution mode, high spatial resolution mode and high sensitivity mode for different applications, which can adapt to the Velocity to Height Ratio (VHR) lower than 0.04. The integration has been finished, and several airborne flight validation experiments have been conducted. The results showed the system’s excellent performance and high efficiency.

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Laboratory spectral calibration and radiometric calibration of hyper-spectral imaging spectrometer

Cited by 16 publications

References 7 publications

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

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

Real-Time Corrections for a Low-Cost Hyperspectral Instrument

Wide Swath and High Resolution Airborne HyperSpectral Imaging System and Flight Validation

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