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Article

Measurement of Gem Colour Using a Computer Vision System: A Case Study with Jadeite-Jade

School of Gemmology, China University of Geosciences (Beijing), Beijing 100083, China
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Academic Editors: Lluís Casas and Roberta Di Febo
Minerals 2021, 11(8), 791; https://doi.org/10.3390/min11080791
Received: 18 June 2021 / Revised: 14 July 2021 / Accepted: 17 July 2021 / Published: 22 July 2021
(This article belongs to the Special Issue Colours in Minerals and Rocks)
This paper introduces computer vision systems (CVSs), which provides a new method to measure gem colour, and compares CVS and colourimeter (CM) measurements of jadeite-jade colour in the CIELAB space. The feasibility of using CVS for jadeite-jade colour measurement was verified by an expert group test and a reasonable regression model in an experiment involving 111 samples covering almost all jadeite-jade colours. In the expert group test, more than 93.33% of CVS images are considered to have high similarities with real objects. Comparing L*, a*, b*, C*, h, and ∆E* (greater than 10) from CVS and CM tests indicate that significant visual differences exist between the measured colours. For a*, b*, and h, the R2 of the regression model for CVS and CM was 90.2% or more. CVS readings can be used to predict the colour value measured by CM, which means that CVS technology can become a practical tool to detect the colour of jadeite-jade. View Full-Text
Keywords: colour; computer vision system; colourimeter; jadeite-jade colour; computer vision system; colourimeter; jadeite-jade
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MDPI and ACS Style

Zhang, S.; Guo, Y. Measurement of Gem Colour Using a Computer Vision System: A Case Study with Jadeite-Jade. Minerals 2021, 11, 791. https://doi.org/10.3390/min11080791

AMA Style

Zhang S, Guo Y. Measurement of Gem Colour Using a Computer Vision System: A Case Study with Jadeite-Jade. Minerals. 2021; 11(8):791. https://doi.org/10.3390/min11080791

Chicago/Turabian Style

Zhang, Sufei, and Ying Guo. 2021. "Measurement of Gem Colour Using a Computer Vision System: A Case Study with Jadeite-Jade" Minerals 11, no. 8: 791. https://doi.org/10.3390/min11080791

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