3D CAD Inspection Alignment for Accurate Defect Positioning
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Solution Overview
Problem
Existing methods for determining defect dimensions on three-dimensional CAD models face accuracy issues due to low coordinate transformation freedom when aligning two-dimensional photographed images with three-dimensional CAD models, leading to deviations in defect positioning.
Innovation Solution
An inspection assistance system that includes a shape recognition unit, defect detection unit, coordinate transformation parameter estimation, three-dimensional CAD model position change, and depiction unit to align and depict defects accurately on three-dimensional CAD models using coordinate transformation parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If coordinate transformation is performed by comparing reference portions between two-dimensional photographed image and three-dimensional CAD model, then defect positioning is enabled, but positioning accuracy deteriorates when position and direction of inspection target object significantly differ from CAD model settings
Solution Approach 1:
The system performs preliminary coordinate transformation parameter estimation by comparing reference portions between the two-dimensional photographed image and three-dimensional CAD model before defect detection. This preliminary alignment enables subsequent accurate defect positioning even when the inspection target object's position and direction significantly differ from the CAD model settings, resolving the contradiction between positioning enablement and accuracy under varying conditions
2Measurement precision
If manual alignment operation is required to achieve accurate coordinate transformation, then positioning accuracy is improved, but operation simplicity deteriorates
Solution Approach 1:
The system automatically estimates coordinate transformation parameters by comparing reference portions extracted from the two-dimensional photographed image with those from the three-dimensional CAD model. This self-service approach eliminates the need for manual alignment operations while maintaining high positioning accuracy, as the system autonomously performs the coordinate transformation alignment process
Data Source
AI summary
An inspection assistance system includes an identification shape unit, a defect detection unit, a coordinate transformation parameter estimation unit, a three-dimensional CAD model position change unit, a two-dimensional simulated image extraction unit, and a depiction unit. The identification shape unit recognizes a shape of an inspection target object based on a two-dimensional photographed image captured by an imaging device. The defect detection unit detects a defect of the inspection target object included in the two-dimensional photographed image. Based on the recognized shape and a three-dimensional CAD model, the coordinate transformation parameter estimation unit estimates a coordinate transformation parameter to transform a first coordinate system corresponding to the three-dimensional CAD model into a second coordinate system corresponding to a viewpoint of the imaging device that captured the two-dimensional photographed image. The three-dimensional CAD model position change unit modifies a position and a direction of viewpoint information of the three-dimensional CAD model.