Classification of the Surface Technological Defects in Rolled Metal Products with the Help of a Deep Neural Network

We develop and study an automated method for the detection and classification of three types of technological defects in rolled metal products. The method is based on the ResNet50 neural network classifier, which makes it possible to recognize three classes of defects in the images of flat surfaces with a total accuracy of 95.8% on the basis of the analysis of experimental data with unbalanced numbers of images of different types. To train the classifier, we used about 88,000 images. It is shown that the application of the model developed on the basis of the ResNet50 neural network guarantees its excellent productivity, high quality of recognition, high speed, and high accuracy, which turns the proposed classifier into an effective tool for the solution of problems of engineering diagnostics and nondestructive testing aimed at the classification of defects on the surfaces of rolled metal products.