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

被引：5
|
作者：
Liu, Fukang [1 ]
Guo, Ying [1 ]
Lv, Shaojie [2 ]
Chen, Guange [3 ]
机构：
[1] China Univ Geosci, Sch Gemmol, Beijing 100083, Peoples R China
[2] China Univ Geosci, Sch Water Resources & Environm, Beijing 100083, Peoples R China
[3] China Univ Geosci, Sch Land Sci & Technol, Beijing 100083, Peoples R China
来源：
MATHEMATICS | 2020年 / 8卷 / 09期
关键词：
entropy method; evaluation; diamond; image processing; QUALITY; GREEN;
D O I：
10.3390/math8091489
中图分类号：
O1 [数学];
学科分类号：
0701 ; 070101 ;
摘要：
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 degrees to 105 degrees rotation at 15 degrees 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.
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收藏
页数：14
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