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Visual detection method for poses and apertures of coplanar equal-size multi-pore workpieces

A visual inspection and workpiece technology, applied in photogrammetry/video surveying, measuring devices, surveying and navigation, etc., can solve the problems of difficult maintenance, uncontrollable rise in cost, and high cost of visual inspection systems, and achieve high precision. Effect

Active Publication Date: 2020-05-08
ZHEJIANG UNIV
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  • Claims
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AI Technical Summary

Benefits of technology

This technology helps create high-accuracy 3D models for industrial applications such as manufacturing processes or quality control checks. It involves calculating specific values called ellipses that match certain features found within images captured from different angles. These calculations help improve model performance when applied over large areas like machinery production lines.

Problems solved by technology

This patented technical problem addressed in this patents relates to improving the efficient and accurate way that mechanisms inspect objects during manufacture without requiring human labor or costly sensors.

Method used

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  • Visual detection method for poses and apertures of coplanar equal-size multi-pore workpieces
  • Visual detection method for poses and apertures of coplanar equal-size multi-pore workpieces
  • Visual detection method for poses and apertures of coplanar equal-size multi-pore workpieces

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Embodiment Construction

[0052] In order to better understand the present invention, the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0053] Such as figure 2 , the implementation steps of the embodiment of the present invention are described in detail below:

[0054] 1. Two cameras whose optical axes are parallel to each other are placed on the same horizontal plane at intervals. Firstly, the two cameras are calibrated respectively. After the calibration is completed, the two cameras respectively constitute the left and right cameras in the binocular vision measurement system. The surface porous workpiece is placed in the public field of view of the binocular camera, and the coplanar porous workpiece to be tested is as follows: figure 1 As shown, the workpiece can be photographed by both the left camera and the right camera, and the left and right cameras simultaneously photograph the workpiece to obta...

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Abstract

The invention discloses a visual detection method for the poses and apertures of coplanar equal-size multi-pore workpieces. A binocular camera is used for carrying out shooting on a coplanar equal-size multi-pore workpiece and collecting left and right images, carrying out ellipse detection on a circular hole to obtain contour parameters of an ellipse, and calculating a vanishing line of a plane where the surface of the workpiece is located on the image; and acquiring a real projection image point according to the vanishing line; reconstructing space coordinates of the circle center of the circular hole by binocular vision according to the real projection image points, performing least square fitting on the space coordinates of the circle center to obtain a plane where the workpiece surface is located and a posture, and finally acquiring the aperture of the circular hole in the workpiece surface by using an elliptic equation and the plane where the workpiece surface is located. According to the method, the spatial pose and the surface circular hole diameter of the coplanar equal-size multi-pore workpiece are calculated with high precision, and problems that manual measurement is tedious, and complex detection equipment is high in manufacturing cost and difficult to maintain are solved.

Description

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Claims

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Application Information

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Owner ZHEJIANG UNIV
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