Arnaud Bougaham
Time: 16h30 - 17h00 (session 2)
Title: Anomaly Detection Applied to Industrial and Medical Images : Robustness, Modularity and Transferability.
Abstract: "The industrial sector evolved with technologies over the decades, culminating in the current era of Industry 4.0. This new paradigm incorporates a range of technologies, including machine learning, and decision systems, with a primary objective of optimizing the factory productivity. Automatic visual inspection is a common approach for anomaly detection to reach this objective. It allows a product image to be judged by an algorithm that asks an operator to confirm any detected anomaly. Traditional algorithms compare images to a golden sample, but they suffer from practical drawbacks, such as a high false positive rate that leads to unnecessary manual checks or human misjudgment. This talk aims to show how deep learning techniques, designed to tackle this problem, are developed at the research side, and deployed at the engineering side, in an automotive electronic production site. High resolution images are controlled, through a Vector Quantized GAN based strategy, so that the reconstructed image shows the normal version of the product. After a collection of metrics on the residual image and other statistics, a neural network (optimized to reach the highest true positive rate, with a customized loss function) classifies the image as normal or abnormal. The method is transferred to medical diagnostic (ovarian cancer segmentation, coma receiptivity analysis, lymphoma evolution monitoring), showing how the insights could be shared across domains."
Arnaud Bougaham obtained a master's degree in electronics and telecommunications at the Polytechnic University of Valenciennes (France) and Barcelona (Spain) as an Erasmus student. In 2008, he joined AISIN-Europe in Mons (Belgium), as a test engineer specialized in electronic manufacturing for the automotive industry. In 2019, he became a digital transformation actor of the production center, taking on responsibilities in the operational technologies department. In this context, he started a PhD thesis in 2020, through a collaboration with AISIN-Europe and the University of Namur (Belgium). He specialized in the development of generative models designed to satisfy quality constraints, for industrial and medical imaging applications. His area of expertise is anomaly detection driven by unsupervised learning techniques (GAN), for critical applications and through an approximated partial AUC loss function.