A method and system for measuring the thickness of multi-size workpieces based on machine vision

Abstract

The invention discloses a multi-size workpiece thickness measuring method and system based on machine vision, and belongs to the field of machine vision detection and measurement. A CCD (Charge Coupled Device) camera and a laser scanner are adopted as image acquisition equipment and are unified under the same world coordinate system. The CCD camera shoots an image of a workpiece entering the shooting area on a conveying belt and transmits the image to a terminal, a minimum enclosing rectangle of the workpiece and a vertex of the minimum enclosing rectangle of the workpiece are calculated, andthe terminal judges the position and the area of the workpiece according to the vertex coordinate of the minimum enclosing rectangle. The workpiece position information is used for adjusting the position of a scanner and the area of the workpiece is used for judging the working mode of the camera. And the terminal generates a 3D global contour map of the workpiece according to the image information acquired by the laser scanner to obtain the thickness of the workpiece. According to the method, manual participation is reduced, labor cost is saved, the thicknesses of workpieces of different sizes can be measured in the same measuring system, a rigid target object or a non-rigid target object can be measured, and the automation degree of detection is improved.

Description

technical field [0001] The invention belongs to the field of machine vision detection and measurement, in particular to a method and system for measuring the thickness of multi-size workpieces based on machine vision. Background technique [0002] In the rapid development of modern industrial automation, the detection of the geometric dimensions of the workpiece, especially the measurement of the thickness of the workpiece, has higher and higher requirements for accuracy and efficiency, and the workpieces to be tested have problems of different sizes and complex surface texture structures. There are higher requirements for the rapidity, robustness and automation of the measurement method. [0003] Nowadays, the three-dimensional dimension measurement technology of semi-finished or finished workpieces on the production line is mainly divided into contact detection and non-contact detection. Contact detection methods mainly include coordinate measuring machines, tomography, e...

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Problems solved by technology

[0004] Technical problem: In order to overcome the problems of easy damage to the workpiece, low measurement efficiency, low measurement accuracy, and inflexible measurement in the face of complex and variable workpiece sizes in the traditional three-dimensional dimension measurement method, this patent provides a machine vision-based The method and system for measuring the thickness of multi-size workpieces can measure rigid and non-rigid workpieces. It is a measurement system that can meet the precise measurement of the thickness of workpieces of different sizes and has high flexibility.

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