Hot-rolled strip steel end part three-dimensional contour measurement method based on double-line structured light

Abstract

The invention belongs to the field of machine vision and particularly relates to a hot-rolled strip steel end three-dimensional contour measurement method based on double-line structured light. The method mainly adopts a double-line structured light method to carry out three-dimensional contour measurement of the shape of an end part of a strip steel which runs at a high speed of 120m / min on a hotrolling production line, and comprises operation steps of 1) establishing a system; 2) camera calibration; 3) light plane calibration; 4) solving three-dimensional space coordinates; 5) image acquisition and preprocessing; 6) processing a light bar image; 7) establishing the triangular relationship; and 8) performing three-dimensional reconstruction to obtain a three-dimensional point cloud chartof the strip steel. The method is advantaged in that the double-line structured light is projected to a plane of the end part of the strip steel, an intersection point of a line structured light andan edge of the strip steel is detected through image processing, a point is converted from a two-dimensional coordinate system to a three-dimensional coordinate system according to the structured light triangulation theory, the shape of the end part of the strip steel is obtained, and width of the strip steel is calculated.

Description

technical field [0001] The invention belongs to the field of machine vision, and in particular relates to a method for measuring the three-dimensional profile of the end of a hot-rolled strip steel based on two-line structured light. Background technique [0002] In the hot rolling production process, after the hot-rolled strip steel billet is rolled by the rough rolling mill, due to the uneven pressure generated by the rough rolling rolls on the strip steel, the head and tail of the strip steel are prone to deformation and elongation. In order to ensure subsequent production The stability of the strip needs to be cut off before entering the finishing mill. [0003] Due to the harsh environment of the hot-rolled strip steel production line, during the optimized shearing process of the hot-rolled steel strip, traditional off-line and manual methods are used for sampling inspection of the end of the strip steel. The production status cannot be corresponded in time, the status...

AI Technical Summary

Problems solved by technology

The above methods only use monocular vision or binocular vision to detect the end of the strip, and cannot measure the width of the strip under conditions of thickness variation, vibration, and inclination, and obtain complete three-dimensional information on the shape of the end of the strip.

The patent "a method for measuring the width of a hot-rolled strip with three-line structured light machine vision" uses binocular vision combined with a three-line structured light method to measure the width of the strip, but for edges with rounded corners, the edge points in the binocular camera are different. Matching, which has a great influence on the error of width measurement

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