G - Physics – 01 – N
Patent
G - Physics
01
N
G01N 21/87 (2006.01) G01N 21/00 (2006.01)
Patent
CA 2681968
An apparatus (10) for assessment, evaluation and grading of gemstones has a stage (11 ) upon which a gemstone may be supported, the stage being enclosed in a housing (15) that is impervious to light. At least one light source (14) located in the housing is adapted to project incident light onto the gemstone. There are means for rotating and tilting the stage so as to vary the orientation of the gemstone to the incident light. A digital camera (16) is located in the housing adjacent the or each light source and is adapted to take images of the gemstone based on reflection and/or refraction of the incident light. There are also information processing means for calibrating and analysing the images, with the information processing means being programmed with an instruction set for colour calibrating the images and then analysing the colour calibrated images by segmentation and histogram measurement.
L'invention porte sur un appareil (10) d'examen, d'évaluation et de classification de pierres précieuses, comportant: un plateau (11) où repose une pierre, placé dans un logement (15) imperméable à la lumière où au moins une source de lumière (14) projette de la lumière incidente sur la pierre; un moyen permettant de faire tourner et d'incliner le plateau pour modifier l'orientation de la pierre précieuse par rapport à la lumière incidente; une caméra numérique (16) placée dans le logement et voisine de la ou des sources de lumière et prenant des images de la pierre en se basant sur la réflexion et-ou la réfraction de la lumière incidente; un moyen informatique d'étalonnage et d'analyse des images, programmé par un jeu d'instructions et effectuant l'étalonnage des couleurs des images, puis analysant les images étalonnées par segmentation et mesure d'histogrammes.
Bischof Leanne
Hilsenstein Volker
Hornabrook Angus Nelson
Hornabrook Graham Alfred
Imrie Robert George
Cameron Ip
Opal Producers Australia Limited
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