PEARL DISCRIMINATION METHOD AND COLOR DISCRIMINATION METHOD

摘要

PROBLEM TO BE SOLVED: To provide a pearl discrimination method and a color discrimination method capable of precisely discriminating whether the color tone of a pearl belongs to a predetermined class or not even in case that the light intensity of every wavelength component of a light source differs from discrimination work to discrimination work.;SOLUTION: Visible light is radiated to a white board and a correction pearl to measure light intensities Wh₁-Wh_n and light intensities Ah₁-Ah_n in wavelengths λ₁-λ_n of the respective reflected lights. Correction values Ws₁-Ws_n are determined based on the light intensities Wh₁-Wh_n and the light intensities Ah₁-Ah_n. Light intensities Aa₁-Aa_n in a reference pearl having a color tone that is the basis of classification are measured. Light intensities W₁-W_n in the white board are measured again. Light intensities A₁-A_n in a pearl to be discriminated are measured. The light intensities Aa₁-Aa_n and the light intensities A₁-A_n are corrected based on the correction values Ws₁-Ws_n and the light intensities W₁-W_n, and then mutually compared.;COPYRIGHT: (C)2005,JPO&NCIPI