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

Minerals

Sufei Zhang¹  Ying Guo¹ 

[1] School of Gemmology, China University of Geosciences (Beijing), Beijing 100083, China;

关键词: colour;    computer vision system;    colourimeter;    jadeite-jade;   

DOI  :  10.3390/min11080791

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown