Method and apparatus for detecting fine cracks on cross section of continuous casting slab

Abstract

The invention relates to a method and an apparatus for detecting fine cracks on a cross section of a continuous casting slab. The apparatus comprises a camera, a light source, an image acquisition card and a computer; the camera and the light source are installed above a sample plate of the continuous casting slab at a certain angle; the data output terminal of the camera is connected with the image acquisition card; the data output terminal of the image acquisition card is connected with the data input terminal of the computer; and the computer performs image processing on multiple acquired images, calculates the dimension of a crack defect and outputs a detection result. The detection method comprises: edge detection, Gauss filtering, gradient binarization, clustering, calculation of crack width, comparison between the width and a threshold, artificial intervention, crack defect determination, crack data preservation or non-crack data discarding. The method and the apparatus help to realize precise detection on fine cracks on the cross section of the continuous casting slab, and avoid misjudgment and judgment omission of crack defects on the surface of the continuous casting slab. Based on the detection result, a quality-detection person is capable of timely mastering the internal quality problem of the continuous casting slab and makes correct determination on the quality degrade of the continuous casting slab.

Description

technical field [0001] The invention relates to a material defect detection method and device, in particular to a strip material defect detection method and device. Background technique [0002] At present, the online detection system based on machine vision has been successfully applied to the production lines of various continuous strips such as strip steel, strip aluminum, copper foil, paper, plastic, etc., which can realize real-time and efficient detection of surface defects of these strips. This type of inspection equipment relies on high-speed cameras to take images of materials on the production line, and uses computers to analyze whether there are defects and what kind of defects exist. [0003] The currently developed surface quality detection devices based on machine vision are mostly used in the steel strip surface detection in the steel industry. Cracks often appear inside the continuous casting slab, and most of the cracks are very small, only a few tens of mi...

AI Technical Summary

Problems solved by technology

[0005] In summary, for the detection of micro-crack defects in continuous casting slabs, there is currently no machine vision detection device that can eliminate the interference of false defects and achieve accurate detection.

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