Diamond Clarity Grading via Optical Image Analysis
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Solution Overview
Problem
Current methods for assessing diamond clarity rely on subjective human judgment, leading to inconsistent and unreliable clarity grades due to factors like vision fatigue and variability among gemologists, even with standardized training.
Innovation Solution
A computerized system using an optical image acquisition device, processor module, and output module to acquire and analyze top view images of diamonds with corrected focus depths, detect defects based on pixel brightness changes, apply penalty scores based on defect geometry and location, and assign clarity grades, ensuring consistent and repeatable assessments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If human gemologists assess diamond clarity using standardized training and procedures, then expertise and experience can be utilized, but repeatability and consistency cannot be guaranteed due to subjective human judgment and vision fatigue
Solution Approach 1:
The patent replaces the manual mechanical system of human gemologist assessment with an automated optical imaging system that captures multiple images of the diamond from different angles and depths, processes them through algorithms, and generates clarity grades objectively without human intervention
Solution Approach 2:
The system enables the diamond clarity assessment to be performed autonomously by the machine itself, where the optical system captures images, the processing unit analyzes defects, and the system automatically assigns clarity grades without requiring human gemologist input
2Measurement precision
If multiple images are captured at different focus depths to improve defect detection, then measurement precision increases, but device complexity and processing requirements increase
Solution Approach 1:
The patent divides the diamond assessment into multiple segmented image captures at different focus depths (e.g., 0.5mm, 1.0mm, 1.5mm, 2.0mm), allowing defects at various depths to be detected separately and then integrated for comprehensive clarity grading
Solution Approach 2:
The system adds the depth dimension to traditional 2D imaging by capturing images at multiple focus depths along the Z-axis, transforming a planar assessment into a three-dimensional volumetric analysis of the diamond's internal and external characteristics
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
The system provides a reliable and consistent method for grading diamond clarity, reducing human error and variability, and enabling standardized assessments across different locations and operators, while also reducing training time and costs for gemologists.
Implementation Method 1
acquiring via an optical image acquisition device a plurality of top view images of a diamond with different focus depths corrected with the refractive index of the diamond
Data Source
AI summary
A process operable using a computerized system (300) grades the clarity of a diamond (315, 400) as a function of internal defects within its body (315, 400). The computerized system (300) includes an optical image acquisition device (310), a processor module (320) and an output module (340) operably interconnected together. The process includes the steps of (i) acquiring via an optical image acquisition device (310) a plurality of top view images of a diamond (315, 400); (ii) in a processor module (320), detecting defects within the body of the diamond (315, 400); and (iii) from an output module (340), providing a signal indicative of the clarity grade assigned in (ii).