论文标题

OIAD:全图像异常检测,并进行分解学习

OIAD: One-for-all Image Anomaly Detection with Disentanglement Learning

论文作者

Wang, Shuo, Chen, Tianle, Chen, Shangyu, Rudolph, Carsten, Nepal, Surya, Grobler, Marthie

论文摘要

相对于一组正常数据,异常检测旨在识别具有异常和异常模式的样本。这对于众多领域应用非常重要,例如工业检查,医学成像和安全执法。与现有的异常检测方法相关的两个关键研究挑战:(1)许多方法在低维问题上表现良好,但是高维实例(例如图像)上的性能是有限的; (2)许多方法通常依赖于传统的监督方法和功能的手动工程,而该主题尚未通过现代深度学习方法进行全面探索,即使标签良好的样本有限。在本文中,我们提出了一个仅使用干净样品的分解学习的一对图像异常检测系统(OIAD)。我们的关键见解是,小扰动对潜在表示的影响可以针对正常样本进行界定,而异常图像通常在此类有界的间隔之外,称为结构一致性。我们实施了这个想法,并评估其在异常检测中的性能。我们使用三个数据集的实验表明,OIAD可以在保持较低的错误警报率的同时检测到超过$ 90 \%的异常。它还可以从标记为干净的样品中检测出可疑样品,与人类认为不寻常的样本相吻合。

Anomaly detection aims to recognize samples with anomalous and unusual patterns with respect to a set of normal data. This is significant for numerous domain applications, such as industrial inspection, medical imaging, and security enforcement. There are two key research challenges associated with existing anomaly detection approaches: (1) many approaches perform well on low-dimensional problems however the performance on high-dimensional instances, such as images, is limited; (2) many approaches often rely on traditional supervised approaches and manual engineering of features, while the topic has not been fully explored yet using modern deep learning approaches, even when the well-label samples are limited. In this paper, we propose a One-for-all Image Anomaly Detection system (OIAD) based on disentangled learning using only clean samples. Our key insight is that the impact of small perturbation on the latent representation can be bounded for normal samples while anomaly images are usually outside such bounded intervals, referred to as structure consistency. We implement this idea and evaluate its performance for anomaly detection. Our experiments with three datasets show that OIAD can detect over $90\%$ of anomalies while maintaining a low false alarm rate. It can also detect suspicious samples from samples labeled as clean, coincided with what humans would deem unusual.

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