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Papers/CFA: Coupled-hypersphere-based Feature Adaptation for Targ...

CFA: Coupled-hypersphere-based Feature Adaptation for Target-Oriented Anomaly Localization

Sungwook Lee, SeungHyun Lee, Byung Cheol Song

2022-06-09Anomaly LocalizationUnsupervised Anomaly DetectionAnomaly DetectionTransfer Learning
PaperPDFCode(official)Code

Abstract

For a long time, anomaly localization has been widely used in industries. Previous studies focused on approximating the distribution of normal features without adaptation to a target dataset. However, since anomaly localization should precisely discriminate normal and abnormal features, the absence of adaptation may make the normality of abnormal features overestimated. Thus, we propose Coupled-hypersphere-based Feature Adaptation (CFA) which accomplishes sophisticated anomaly localization using features adapted to the target dataset. CFA consists of (1) a learnable patch descriptor that learns and embeds target-oriented features and (2) scalable memory bank independent of the size of the target dataset. And, CFA adopts transfer learning to increase the normal feature density so that abnormal features can be clearly distinguished by applying patch descriptor and memory bank to a pre-trained CNN. The proposed method outperforms the previous methods quantitatively and qualitatively. For example, it provides an AUROC score of 99.5% in anomaly detection and 98.5% in anomaly localization of MVTec AD benchmark. In addition, this paper points out the negative effects of biased features of pre-trained CNNs and emphasizes the importance of the adaptation to the target dataset. The code is publicly available at https://github.com/sungwool/CFA_for_anomaly_localization.

Results

TaskDatasetMetricValueModel
Anomaly DetectionMVTec ADDetection AUROC99.3CFA
Anomaly DetectionMVTec ADSegmentation AUROC98.2CFA
Anomaly DetectionVisADetection AUROC92CFA
Anomaly DetectionVisASegmentation AUPRO (until 30% FPR)55.1CFA

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