Gemstone Clarity Grading With Multi-Angle Optical Imaging
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Solution Overview
Problem
Traditional gemstone grading methods are manual and subjective, lacking consistency and efficiency in assessing clarity, particularly in terms of surface cleanliness and internal inclusions.
Innovation Solution
A system comprising an image capturing device, illumination arrangements, and a manipulator arm to rotate and position the gemstone for multiple orientations and depths of focus, combined with image processing to objectively grade clarity and cleanliness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual grading by skilled gemologists is used, then expertise and judgment are applied, but consistency and efficiency are lacking
Solution Approach 1:
The patent replaces the manual mechanical grading process with an automated optical imaging system. Multiple illumination arrangements (direct, dark-field, facet illumination) and image capturing devices automatically capture and analyze gemstone characteristics, eliminating human subjectivity and improving grading consistency while significantly increasing throughput efficiency
Solution Approach 2:
The system creates multiple optical copies of the gemstone under different illumination conditions and angles. By capturing images from various perspectives and lighting scenarios, the system builds a comprehensive digital representation that can be analyzed objectively, replacing the need for repeated manual examination
2Measurement precision
If multiple orientations and depths of focus are captured, then comprehensive clarity assessment is achieved, but system complexity increases
Solution Approach 1:
The patent segments the clarity assessment into multiple specialized illumination modes (direct illumination for surface polish, dark-field for internal inclusions, facet illumination for specific facets). Each illumination arrangement targets specific clarity aspects, allowing comprehensive evaluation while organizing complexity into manageable functional modules
Solution Approach 2:
The system adds the dimension of multiple orientations and depths of focus to the imaging process. By rotating the gemstone holder and adjusting focus planes, the system captures clarity information from three-dimensional perspectives, transforming a single-view limitation into multi-dimensional comprehensive assessment
3Reliability
If automated image processing is implemented, then objectivity and repeatability improve, but initial setup and calibration requirements increase
Solution Approach 1:
The system employs multiple adjustable parameters including illumination intensity, angle of incidence, holder rotation angles, and image processing thresholds. These parameters can be optimized and calibrated once during setup, after which the automated system maintains consistent objective grading through repeatable parameter settings across different gemstones
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Provides consistent and efficient grading of gemstone clarity by capturing and processing images from various angles and depths, reducing human error and enhancing accuracy in assessing surface polish and internal inclusions.
Implementation Method 1
an image capturing device disposed to capture images along a line of sight
Implementation Method 2
capture images along a line of sight; selectively control the image capturing device to capture an image of each of the generated plurality of illumination patterns
Implementation Method 3
an illumination sub-system comprising: a direct illumination arrangement, a dark-field illumination arrangement, and a facet illumination arrangement
Implementation Method 4
the direct illumination arrangement comprises a collimated light source, and a light directing arrangement to carry a collimated light beam from the collimated light source to at least one facet of the gemstone
Data Source
AI summary
Systems and methods for grading a gemstone including its clarity are presented. An image capturing device disposed to capture images along a line of sight: a holder to support the gemstone thereon; a manipulator arm, carrying the holder, configured to rotate along a roll axis, and allow for rotation of the holder along a pitch axis: an illumination sub-system comprising a direct illumination arrangement, a dark-field illumination arrangement, and a facet illumination arrangement; and a controller arrangement configured to control the illumination arrangements to generate a plurality of illumination patterns for the gemstone, control the manipulator arm to position the holder for a plurality of orientations of the gemstone, control the image capturing device to capture an image of each of the generated illumination patterns, each of the orientations and each of one or more depths of focus, and process the captured images to grade the gemstone.