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Generative models based on variational autoencoders are a popular technique for detecting anomalies in images in a semi-supervised context. A common approach employs the anomaly score to detect the presence of anomalies, and it is known to…

Machine Learning · Computer Science 2024-07-30 Muhammad Rashid , Elvio Amparore , Enrico Ferrari , Damiano Verda

Anomaly detection has wide applications in machine intelligence but is still a difficult unsolved problem. Major challenges include the rarity of labeled anomalies and it is a class highly imbalanced problem. Traditional unsupervised…

Machine Learning · Computer Science 2021-04-27 Zhi Chen , Jiang Duan , Li Kang , Guoping Qiu

Generative adversarial networks (GANs) provide an algorithmic framework for constructing generative models with several appealing properties: they do not require a likelihood function to be specified, only a generating procedure; they…

Machine Learning · Statistics 2017-02-28 Shakir Mohamed , Balaji Lakshminarayanan

One-class novelty detection is the process of determining if a query example differs from the training examples (the target class). Most of previous strategies attempt to learn the real characteristics of target sample by using generative…

Computer Vision and Pattern Recognition · Computer Science 2020-02-06 Chengwei Chen , Wang Yuan , Yuan Xie , Yanyun Qu , Yiqing Tao , Haichuan Song , Lizhuang Ma

Anomaly detection in imbalanced datasets is a frequent and crucial problem, especially in the medical domain where retrieving and labeling irregularities is often expensive. By combining the generative stability of a $\beta$-variational…

Machine Learning · Computer Science 2023-10-30 Fiete Lüer , Tobias Weber , Maxim Dolgich , Christian Böhm

Generative Adversarial Networks (GANs) are a class of generative algorithms that have been shown to produce state-of-the art samples, especially in the domain of image creation. The fundamental principle of GANs is to approximate the…

Machine Learning · Statistics 2018-03-22 G. Biau , B. Cadre , M. Sangnier , U. Tanielian

Generative adversarial networks (GANs) are one of the greatest advances in AI in recent years. With their ability to directly learn the probability distribution of data, and then sample synthetic realistic data. Many applications have…

Generative adversarial networks (GANs) are a learning framework that rely on training a discriminator to estimate a measure of difference between a target and generated distributions. GANs, as normally formulated, rely on the generated…

Machine Learning · Statistics 2018-02-23 R Devon Hjelm , Athul Paul Jacob , Tong Che , Adam Trischler , Kyunghyun Cho , Yoshua Bengio

Supervised classification methods have been widely utilized for the quality assurance of the advanced manufacturing process, such as additive manufacturing (AM) for anomaly (defects) detection. However, since abnormal states (with defects)…

Machine Learning · Computer Science 2022-11-29 Jihoon Chung , Bo Shen , Zhenyu , Kong

Machine learning (ML) algorithms are optimized for the distribution represented by the training data. For outlier data, they often deliver predictions with equal confidence, even though these should not be trusted. In order to deploy…

Image and Video Processing · Electrical Eng. & Systems 2021-03-17 Milda Pocevičiūtė , Gabriel Eilertsen , Claes Lundström

Generative networks are fundamentally different in their aim and methods compared to CNNs for classification, segmentation, or object detection. They have initially not been meant to be an image analysis tool, but to produce naturally…

Computer Vision and Pattern Recognition · Computer Science 2022-07-11 Markus Wenzel

Unsupervised anomaly detection models which are trained solely by healthy data, have gained importance in the recent years, as the annotation of medical data is a tedious task. Autoencoders and generative adversarial networks are the…

Computer Vision and Pattern Recognition · Computer Science 2022-12-12 Marc Dietrichstein , David Major , Martin Trapp , Maria Wimmer , Dimitrios Lenis , Philip Winter , Astrid Berg , Theresa Neubauer , Katja Bühler

The detection and the quantification of anomalies in image data are critical tasks in industrial scenes such as detecting micro scratches on product. In recent years, due to the difficulty of defining anomalies and the limit of correcting…

Computer Vision and Pattern Recognition · Computer Science 2018-11-08 Masanari Kimura , Takashi Yanagihara

Generative adversarial networks (GANs) have given us a great tool to fit implicit generative models to data. Implicit distributions are ones we can sample from easily, and take derivatives of samples with respect to model parameters. These…

Machine Learning · Statistics 2017-02-28 Ferenc Huszár

Generative adversarial networks have been able to generate striking results in various domains. This generation capability can be general while the networks gain deep understanding regarding the data distribution. In many domains, this data…

Machine Learning · Computer Science 2019-09-16 Milad Salem , Shayan Taheri , Jiann Shiun Yuan

Anomaly detection is a significant and hence well-studied problem. However, developing effective anomaly detection methods for complex and high-dimensional data remains a challenge. As Generative Adversarial Networks (GANs) are able to…

Machine Learning · Computer Science 2018-12-07 Houssam Zenati , Manon Romain , Chuan Sheng Foo , Bruno Lecouat , Vijay Ramaseshan Chandrasekhar

Anomaly detection is a classical problem where the aim is to detect anomalous data that do not belong to the normal data distribution. Current state-of-the-art methods for anomaly detection on complex high-dimensional data are based on the…

Machine Learning · Computer Science 2019-04-03 Cuong Phuc Ngo , Amadeus Aristo Winarto , Connie Kou Khor Li , Sojeong Park , Farhan Akram , Hwee Kuan Lee

Adversarial attacks on image classification systems have always been an important problem in the field of machine learning, and generative adversarial networks (GANs), as popular models in the field of image generation, have been widely…

Computer Vision and Pattern Recognition · Computer Science 2024-12-25 Yahe Yang

In order to introduce deep learning technologies into anomaly detection, Generative Adversarial Networks (GANs) are considered as important roles in the algorithm design and realistic applications. In terms of GANs, event probability…

Machine Learning · Computer Science 2024-04-08 Rui She , Pingyi Fan

Novelty detection is the process of determining whether a query example differs from the learned training distribution. Previous methods attempt to learn the representation of the normal samples via generative adversarial networks (GANs).…

Computer Vision and Pattern Recognition · Computer Science 2021-06-21 Chengwei Chen , Yuan Xie , Shaohui Lin , Ruizhi Qiao , Jian Zhou , Xin Tan , Yi Zhang , Lizhuang Ma