1 November 2001 Online machine vision method for measuring the diameter and straightness of seamless steel pipes
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Optical Engineering, 40(11), (2001). doi:10.1117/1.1412424
Abstract
We present a novel method to measure the diameter and straightness of seamless steel pipes. A pair of line-structured lasers, which locate on different sides of the pipe but are in a common plane, cast on the pipe to create two elliptical arcs. Two CCD cameras capture these two arcs. Major and minor axis radii and spatial 3D coordinates of every corresponding elliptical cross-section center can be calculated through ellipse fitting. A pair of line-structured laser sensors, each of which includes a line-structured laser and a CCD camera, are placed at every sampling cross section of the pipe, and thus the pipe's crosssection diameter and furthermore the straightness of the pipe can be solved. We provide an on-line machine vision method for measuring a seamless steel pipe's diameter and straightness, including the design of the system, the deduction of the mathematical model, and the research of the experimental results.
Changku Sun, Qiang You, Yu Qiu, Shenghua Ye, "Online machine vision method for measuring the diameter and straightness of seamless steel pipes," Optical Engineering 40(11), (1 November 2001). http://dx.doi.org/10.1117/1.1412424
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KEYWORDS
Sensors

Machine vision

Calibration

CCD cameras

Imaging systems

CCD image sensors

Sensor calibration

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