US 11,988,610 B2
Detection and grading of the effect of blue fluorescence on diamond appearances
Yun Luo, Carlsbad, CA (US); David Nelson, Carlsbad, CA (US); Troy Ardon, Carlsbad, CA (US); and Christopher M. Breeding, Carlsbad, CA (US)
Assigned to Gemological Institute of America, Inc. (GIA), Carlsbad, CA (US)
Filed by Gemological Institute of America, Inc. (GIA), Carlsbad, CA (US)
Filed on Dec. 17, 2021, as Appl. No. 17/555,241.
Claims priority of provisional application 63/127,125, filed on Dec. 17, 2020.
Prior Publication US 2022/0196565 A1, Jun. 23, 2022
Int. Cl. G01N 21/88 (2006.01); G06T 7/13 (2017.01); G06V 10/141 (2022.01); G06V 10/60 (2022.01); G06V 20/69 (2022.01)
CPC G01N 21/8851 (2013.01) [G01N 21/8806 (2013.01); G06T 7/13 (2017.01); G06V 10/141 (2022.01); G06V 10/60 (2022.01); G06V 20/693 (2022.01); G01N 2021/8835 (2013.01); G01N 2021/8854 (2013.01); G01N 2021/8887 (2013.01); G06T 2207/20224 (2013.01)] 14 Claims
OG exemplary drawing
 
11. A system for analyzing a gemstone, comprising:
a stage configured to support a gemstone for analysis;
a hemispherical cover to the stage, configured to cover the stage,
wherein the hemispherical cover includes a port for a digital camera directed at the stage,
wherein the digital camera is in communication with a computer having a processor and memory;
a fiber optic ring light around the stage inside the hemispherical cover;
a first light controller in communication with the computer and in communication with a dichroic beam splitter wherein the first light controller includes a Ultra Violet (UV) light source and tunable UV adjusters;
a second light controller in communication with the computer and in communication with the dichroic beam splitter wherein the second light controller includes a white light source,
wherein the dichroic beam splitter is configured to direct both UV and white light to the fiber optic ring light;
the computer configured to, receive a digital image from the camera of the gemstone on the stage,
analyze pixels in the digital image of the gemstone with assignment of a brightness value to each pixel in the captured image,
plot a count of each of the brightness values of the pixels in the digital image,
wherein the plot of the count of each of the brightness values includes a dark curve and a light curve,
determine a center of the dark curve in the plot of the count of each of the brightness values of the pixels in the digital image,
determine a center of the light curve in in the plot of the count of each of the brightness values of the pixels in the digital image,
determine a difference between the brightness average of the light curve and the brightness average of the dark curve,
use the difference between the brightness average of the light curve and the brightness average of the dark curve to determine a haziness score to the diamond.