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Sensors 2018, 18(11), 3820;

Computerized Ultrasonic Imaging Inspection: From Shallow to Deep Learning

National Metrology Institute of Japan (NMIJ), National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 2, Tsukuba 305-8568, Japan
Author to whom correspondence should be addressed.
Received: 23 October 2018 / Revised: 2 November 2018 / Accepted: 2 November 2018 / Published: 7 November 2018
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For many decades, ultrasonic imaging inspection has been adopted as a principal method to detect multiple defects, e.g., void and corrosion. However, the data interpretation relies on an inspector’s subjective judgment, thus making the results vulnerable to human error. Nowadays, advanced computer vision techniques reveal new perspectives on the high-level visual understanding of universal tasks. This research aims to develop an efficient automatic ultrasonic image analysis system for nondestructive testing (NDT) using the latest visual information processing technique. To this end, we first established an ultrasonic inspection image dataset containing 6849 ultrasonic scan images with full defect/no-defect annotations. Using the dataset, we performed a comprehensive experimental comparison of various computer vision techniques, including both conventional methods using hand-crafted visual features and the most recent convolutional neural networks (CNN) which generate multiple-layer stacking for representation learning. In the computer vision community, the two groups are referred to as shallow and deep learning, respectively. Experimental results make it clear that the deep learning-enabled system outperformed conventional (shallow) learning schemes by a large margin. We believe this benchmarking could be used as a reference for similar research dealing with automatic defect detection in ultrasonic imaging inspection. View Full-Text
Keywords: nondestructive evaluation; ultrasonic imaging; computer vision; deep learning; local descriptor; convolutional neural networks nondestructive evaluation; ultrasonic imaging; computer vision; deep learning; local descriptor; convolutional neural networks

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Ye, J.; Ito, S.; Toyama, N. Computerized Ultrasonic Imaging Inspection: From Shallow to Deep Learning. Sensors 2018, 18, 3820.

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