Dr. Hiroshi Takahashi Profile

Dr. Hiroshi Takahashi

Director at Gemological Institute of America

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Author

Publications (3)

Proceedings Article | 3 October 2022 Presentation + Paper

Automatic jewelry identification and evaluation based on imaging-assisted Raman spectroscopy

Tsung-Han Tsai, Hiroshi Takahashi

Proceedings Volume 12216, 1221609 (2022) https://doi.org/10.1117/12.2631779

KEYWORDS: Diamond, Raman spectroscopy, Spectroscopy, Luminescence, Minerals, Cameras, Imaging spectroscopy, Imaging systems

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Proceedings Article | 3 October 2022 Poster + Paper

Development of UV-Vis-NIR-MIR absorption spectroscopy for gemstone analysis

Zhen Wang, Hiroshi Takahashi

Proceedings Volume 12216, 122160R (2022) https://doi.org/10.1117/12.2624632

KEYWORDS: Absorption, Spectrometers, Light sources, Absorption spectroscopy, Diamond, Corundum, Time metrology, Reflection, FT-IR spectroscopy, Signal detection

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Proceedings Article | 14 September 2016 Paper

Diamond color measurement instrument based on image processing

H. Takahashi, S. Mandal, M. Toosi, J. Zeng, W. Wang

Proceedings Volume 9970, 997015 (2016) https://doi.org/10.1117/12.2235801

KEYWORDS: Diamond, Image processing, Visualization, Light sources, Chemical species, Nitrogen, Absorption, Prototyping, Cameras, Edge detection

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