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Proceedings Paper

Research on real-time measurement and grading method for pearl color
Author(s): Feng Zhu; Kaihua Wu; Li Ma; Jilin Zhou
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Paper Abstract

The pearl color and color uniformity are important to its price. The paper presented a new real-time method to measure and grade the pearl color based on optoelectronic techniques. The method uses HSI (Hue, Saturation and Intensity) color model, diffuse reflection illumination, CCD (Charge Couple Device) camera with fine color reproduction and digital image processing technology to realize the parameters of color matrix of pearl color. These parameters, including mean values (h and s), variances (σh and σs) and absolute values of third moments (|th| and |ts|) of H and S, were acquired. Then the industrial control computer acquires the grading signals. The grading devices graded the pearls. The method could measure and grade the pearl on real-time and meet the requirement of grading.

Paper Details

Date Published: 21 November 2007
PDF: 5 pages
Proc. SPIE 6723, 3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 672308 (21 November 2007); doi: 10.1117/12.782703
Show Author Affiliations
Feng Zhu, Hangzhou Dianzi Univ. (China)
Kaihua Wu, Hangzhou Dianzi Univ. (China)
Li Ma, Hangzhou Dianzi Univ. (China)
Jilin Zhou, Hangzhou Dianzi Univ. (China)


Published in SPIE Proceedings Vol. 6723:
3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment
Junhua Pan; James C. Wyant; Hexin Wang, Editor(s)

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