Application of the Entropy Method and Color Difference Formula to the Evaluation of Round Brilliant Cut Diamond Scintillation

Fukang Liu, Ying Guo, Shaojie Lv and Guange Chen
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Fukang Liu: School of Gemmology, China University of Geosciences, Beijing 100083, China
Ying Guo: School of Gemmology, China University of Geosciences, Beijing 100083, China
Shaojie Lv: School of Water Resources and Environment, China University of Geosciences, Beijing 100083, China
Guange Chen: School of Land Science and Technology, China University of Geosciences, Beijing 100083, China

Mathematics, 2020, vol. 8, issue 9, 1-14

Abstract: A modeling approach combining the entropy method and color difference formula is proposed in order to quantitatively evaluate diamond scintillation. The images of 66 diamonds were captured from 0° to 105° rotation at 15° intervals. The color difference of corresponding pixels in adjacent rotation angle images was calculated using a MatLab r2014a program, which indicated the diamond’s color change due to its scintillation. A threshold (10) was determined to divide the color difference into seven color difference intervals, the percentage of which indicated the color-change area. The color difference and the percentage were comprehensively analyzed using the entropy method to evaluate diamond scintillation objectively and quantitatively. Lightness was the main factor affecting the diamond scintillation while chroma and hue also significantly affected it.

Keywords: entropy method; evaluation; diamond; image processing (search for similar items in EconPapers)
JEL-codes: C (search for similar items in EconPapers)
Date: 2020
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