Combining GANs and AutoEncoders for Efficient Anomaly Detection

11/16/2020

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by   Fabio Carrara, et al.

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Consiglio Nazionale delle Ricerche

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118

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In this work, we propose CBiGAN – a novel method for anomaly detection in images, where a consistency constraint is introduced as a regularization term in both the encoder and decoder of a BiGAN. Our model exhibits fairly good modeling power and reconstruction consistency capability. We evaluate the proposed method on MVTec AD – a real-world benchmark for unsupervised anomaly detection on high-resolution images – and compare against standard baselines and state-of-the-art approaches. Experiments show that the proposed method improves the performance of BiGAN formulations by a large margin and performs comparably to expensive state-of-the-art iterative methods while reducing the computational cost. We also observe that our model is particularly effective in texture-type anomaly detection, as it sets a new state of the art in this category. Our code is available at https://github.com/fabiocarrara/cbigan-ad/.