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-Whnand light intensities Ah1-Ahnin wavelengthsλ1-λnof the respective reflected lights. Correction values Ws1-Wsnare determined based on the light intensities Wh1-Whnand the light intensities Ah1-Ahn. Light intensities Aa1-Aanin a reference pearl having a color tone that is the basis of classification are measured. Light intensities W1-Wnin the white board are measured again. Light intensities A1-Anin a pearl to be discriminated are measured. The light intensities Aa1-Aanand the light intensities A1-Anare corrected based on the correction values Ws1-Wsnand the light intensities W1-Wn, and then mutually compared. COPYRIGHT: (C)2005,JPO&NCIPI