Digital Optical Comparator Real-Time CAD Overlay
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Solution Overview
Problem
Prior art optical comparators rely heavily on operator skill for aligning parts and reference templates, lack efficient means for orienting them, and do not provide a straightforward method for real-time comparison of digital images with CAD drawings.
Innovation Solution
A digital optical comparator system that captures high-resolution images, corrects for distortion, overlays CAD drawings onto the images in real-time, and allows for automatic alignment using pattern matching software, enabling precise comparison and measurement of parts against specifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual alignment of part and reference template is used, then operator skill can achieve comparison, but alignment time and operational complexity increase significantly
Solution Approach 1:
The patent replaces manual mechanical alignment operations with automated digital image processing. The coordinate transformation system automatically calculates and applies transformations to align the captured part image with the reference template, eliminating the need for manual positioning and reducing alignment time from minutes to seconds.
Solution Approach 2:
The system performs self-alignment through automated feature detection and coordinate transformation. The computer automatically identifies corresponding features between the part image and reference template, calculates transformation parameters, and adjusts the display position without operator intervention, making the alignment process self-service oriented.
2Measurement precision
If physical transparency overlay method is used, then direct visual comparison is possible, but precision and ease of digital measurement are reduced
Solution Approach 1:
The patent replaces physical transparency overlay with digital image overlay on a computer display. The system captures the part image, retrieves the reference template digitally, and superimposes them on a screen with precise pixel-level alignment. This digital approach enables accurate dimensional measurements using software tools while eliminating the need for physical transparencies and manual overlay operations.
3Extent of automation
If coordinate transformation for rotation and translation is implemented, then automatic alignment is achieved, but processing time and computational complexity increase
Solution Approach 1:
The patent implements coordinate transformation algorithms that automatically calculate rotation angles and translation distances needed to align the part image with the reference template. The system uses feature detection to identify corresponding points, computes transformation parameters mathematically, and applies them to adjust the display position, achieving full automation of the alignment process.
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
Enables quick and accurate comparison of parts with CAD drawings, automatically aligning images and highlighting discrepancies, facilitating real-time measurement and verification of dimensional tolerances without the need for manual repositioning of parts.
Implementation Method 1
a light source for illuminating a workpiece and a reference object
Implementation Method 2
a camera for obtaining images of the workpiece and the reference object
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A digital optical comparator has a holder for a part under study. A light source illuminates the part and casts an image of the part onto a camera, which is provided with a lens. The image captured by the camera is displayed on a screen, and a drawing of the part is overlaid on the image of the part. Thus, defects in manufacturing can be easily and readily identified. In addition, a determination of whether the part is manufactured within tolerances can also be visually determined.