Patent ID: 11892405
Assignee: GEMOLOGICAL INSTITUTE OF AMERICA, INC. (GIA)
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A method comprising:
obtaining at least a first image and a second image of a sample gemstone from an image capture system, the first image captured under non-UV light and the second image captured under UV light;
generating a fluorescence mask for the second image based on an outline mask determined using the first image and/or a determined fluorescence area of the sample gemstone, wherein the outline mask excludes a portion of the first image outside of determined boundary lines of the sample gemstone in the first image;
converting values for color components in each pixel of at least the second image that are within the fluorescence mask to parameters representing a color characteristic of each pixel;
calculating a first fluorescence score of the sample gemstone based on an average value of parameters of pixels in a defined area in the second and third color pixelated images within the corresponding fluorescence mask;
calculating a second fluorescence score based on pixels within the outline mask; and
assessing a fluorescence characteristic of the sample gemstone based on a comparison of the first fluorescence score and/or the second fluorescence score with fluorescent scores of one or more control gemstones.