AR Overlay for 3D Printed Defect Detection
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Solution Overview
Problem
Current methods for detecting defects in 3D printed products, such as over or under-deposition of material, and environmental changes, are either costly due to reliance on advanced machine vision technologies or prone to 'change blindness' in human inspections, making it difficult to accurately identify subtle differences between the manufactured product and its design.
Innovation Solution
A system utilizing augmented reality (AR) technology to project a 3D reference model onto the physical object, allowing human inspectors to rapidly switch between un-augmented and augmented views to identify differences, and an automatic change-detection module to quantify these differences, including color, texture, and structural variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If advanced machine vision technologies and expensive imaging equipment are used to detect defects, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent uses a camera to capture images of the manufactured object and overlays a digital model (copy) of the object onto the captured image. This allows for visual comparison between the manufactured object and its digital twin, enabling defect detection without requiring complex machine vision systems. The overlay technique creates a virtual copy that can be directly compared with the physical object in the image.
2Device complexity
If human inspectors are used to determine whether a manufactured object matches the design, then device complexity is reduced, but measurement precision deteriorates due to change blindness
Solution Approach 1:
The patent introduces an intermediary system that includes a camera, processing unit, and overlay mechanism. This intermediary automatically captures images, processes them, and superimposes the digital model onto the captured image, assisting human inspectors in detecting defects that would otherwise be missed due to change blindness.
Solution Approach 2:
The system creates a visual copy of the manufactured object using a digital model overlaid on the captured image. This copy allows inspectors to easily compare the actual object with its intended design, making subtle defects visible without requiring the inspector to detect them through unaided vision alone.
3Productivity
If rapid switching between un-augmented and augmented views is implemented, then productivity is improved, but ease of operation may deteriorate due to the need to interpret alternating views
Solution Approach 1:
The system implements periodic action by rapidly switching between displaying the captured image alone and displaying the captured image with the digital model overlay. This periodic switching allows inspectors to quickly compare the manufactured object with its design reference, improving inspection speed while maintaining ease of use through intuitive visual comparison.
Data Source
AI summary
One embodiment can provide a system for detecting a difference between a physical object and a reference model corresponding to the physical object. During operation, the system obtains a real-world image of the physical object and generates an augmented reality (AR) image by projecting a three-dimensional overlay generated from the reference model onto the physical object in the real-world image. While generating the AR image, the system aligns a pose of the reference model to a pose of the physical object. The system can detect the difference between the physical object and the reference model based on the generated AR image and the real-world image.