14 September 2016 Diamond color measurement instrument based on image processing
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Abstract
Gemological Institute of America (GIA) has developed a diamond color measurement instrument that can provide accurate and reproducible color measurement results. The instrument uses uniform illumination by a daylight-approximating light source; observations from a high-resolution color-camera with nearly zero-distortion bi-telecentric lens, and image processing to calculate color parameters of diamonds. Experiments show the instrument can provide reproducible color measurement results and also identify subtle color differences in diamonds with high sensitivity. The experimental setup of the prototype instrument and the image processing method for calculating diamond color parameters are presented in this report.
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H. Takahashi, S. Mandal, M. Toosi, J. Zeng, W. Wang, "Diamond color measurement instrument based on image processing", Proc. SPIE 9970, Optics and Photonics for Information Processing X, 997015 (14 September 2016); doi: 10.1117/12.2235801; https://doi.org/10.1117/12.2235801
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