Image Anomaly Detection Based on Controllable Self-Augmentation

Liujie Hua, Yichao Cao, Yitian Long, Shan You, Xiu Su, Jun Long, Yueyi Luo, Chang Xu

Abstract: Based on data synthesis, anomaly detection (AD) methods often rely on external data for data synthesis. However, most external abnormal data exhibits strong randomness, which may lead to a reduced range of diversity among the synthesized data. In order to achieve a broader diversity in data synthesis, it is necessary to not only have highly diverse data but also to incorporate low-diversity noise data. To enhance the diversity range of the synthesized data, this study proposes a diversity measurement assisted by image self-representation: measuring the distance between noise data and normal data and quantitatively synthesizing diversified data by selecting diverse noise data for synthesis, namely, Diversified Synthesis (DS). Diversified Synthesis introduces patch measurement and a controllable enhancement module to establish controllable diversified enhanced data. The contribution of this study lies in proposing a novel diversified synthesis method, which achieves a broader diversity synthesis through the introduction of image self-representation-assisted diversity measurement and quantitative synthesis. Furthermore, through the self-enhancement data augmentation method, the use of image intrinsic features for enhancement achieves diversity and multi-scale characteristics in the synthesized data, thereby improving the training performance of the discriminative model. This provides an effective optimization solution for comprehensive anomaly detection methods.