PEARL GRADING METHOD

A pearl grading method, comprising the following steps: (1) determining color types of pearls to be graded; (2) generating a simulated three-dimensional graph of the pearls to be graded; (3) calculating roundness, so as to obtain a roundness grade; (4) calculating the diameter of the simulated three-dimensional graph, so as to obtain a diameter grade; (5) drawing an illumination-wavelength reflection spectrum; (6) changing a detected part, and drawing an illumination-wavelength reflection spectrum again; (7) repeating the step (6) for at least two times; (8) performing weighted average to obtain a correction curve; and (9) comparing the correction curve with each glossiness grade spectrum baseline, so as to determine a glossiness grade according to the spectrum baseline with the highest coincidence degree. The method has the beneficial effects that the method is capable of automatically grading pearls to be graded by means of image identification and spectral analysis technologies, and ...