An image detection method for surface defects of silicon steel plate under the interference of oil pollution

Abstract

A method for detecting surface defect images of silicon steel plates under the interference of oil pollution, including: using an area array industrial camera to collect surface defect images of silicon steel plates; using visual saliency methods to detect defects on the collected surface defect images of silicon steel plates; using saliency-based line scanning morphology The invention uses a scientific detection method to position and detect the oil stain defect image; the invention excludes the situation where the silicon steel plate is covered by oil stain interference objects from the defect detection. These pseudo-defect interference increases the difficulty of target detection and identification. It solves the problems of cluttered background, covered oil interference and reflective pseudo-defect interference during defect detection; the present invention performs a line scan filling operation on binary images lacking information, which can effectively obtain the oil interference area; this invention The invention uses an edge processing method based on morphological theory to remove oily edges and reflective pseudo-defect edges, avoiding the problem that the subtraction operation cannot effectively eliminate pseudo-edges.

Description

technical field [0001] The invention belongs to the technical field of machine vision and nondestructive testing, and in particular relates to an image detection method for surface defects of a silicon steel plate under the interference of oil pollution. Background technique [0002] Among metal sheets, silicon steel sheets are high-end steel products, and their manufacturing technology and product quality have become one of the important symbols to measure a country's special steel production and technological development level. Silicon steel plate, also known as silicon steel plate, is a silicon-iron soft magnetic alloy with extremely low carbon content, generally containing 0.5-4.5% silicon. It is mainly used to make iron cores of various generators, motors and transformers. At the same time, silicon steel plates are also indispensable and important soft magnetic alloy materials in electronics, electric power and military industries. Since the silicon steel plate is clos...

AI Technical Summary

Problems solved by technology

However, target information may still be covered by disturbances in the obtained defect images. For example, defect targets may be covered by oil stains in the surface images of silicon steel sheets. These pseudo-defect interferences increase the accuracy of target detection and recognition. difficulty

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