Application of a hyperspectral camera for colorimetric and spectroscopic measurements under natural light on outdoors artistic polychrome surfaces
DOI:
https://doi.org/10.23738/CCSJ.150207Keywords:
Hyperspectral imaging, polychromatic surfaces, natural light, Specim IQ, colorimetric analysisAbstract
The aim of this study is to define the parameters of accuracy of data acquired with the Specim IQ hyperspectral camera for CIE colorimetric measurements of polychrome surfaces in outdoor architectural settings with natural light. Furthermore, the study aims to compare the data obtained by the Specim IQ camera with those acquired by a contact colorimeter (Konica-Minolta CM-700d). CIE colorimetric measurements are generally acquired with dedicated instruments, such as tristimulus method colorimeters and spectrophotometric method, which require contact with the surface and coverage areas on the order of tens of mm2. The characteristics of requiring contact and analyzing very small areas can severely limit the study of artistic polychrome surfaces. This is because it may not always be possible to touch the analyzed surface and the measured areas may not necessarily be representative of a wider area of the same color. To overcome these limitations, one possible alternative is to use imaging techniques to acquire measurements from a distance while covering larger areas of the analyzed artifact. To calculate the colorimetric values as defined by the CIE and to also have the possibility to acquire spectroscopic data it was used the Specim IQ compact hyperspectral camera. This camera acquires 204 bands with a spectral resolution of 7 nm and an acquisition step of 3.5 nm in the 400-1000 nm operating range.
Colorimetric data were initially acquired on eight different color targets and two color palettes using a spectrocolorimeter. Subsequently, outdoor tests were conducted on the same samples under natural light using the Specim IQ hyperspectral camera. As a result, the operating characteristics of the hyperspectral camera for outdoor measurements aimed at studying the color of polychrome surfaces were defined.
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Copyright (c) 2023 Filippo Cherubini, Andrea Casini, Costanza Cucci, Marcello Picollo, Lorenzo Stefani, Maurizio De Vita
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