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A Survey on Open Set Recognition

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arxiv 2109.00893 v1 pith:GUC4URGS submitted 2021-08-18 cs.CV

classification cs.CV
keywords modelsopenrecognitionsurveytrainingunknownadditionallyadvantages
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Open Set Recognition (OSR) is about dealing with unknown situations that were not learned by the models during training. In this paper, we provide a survey of existing works about OSR and distinguish their respective advantages and disadvantages to help out new researchers interested in the subject. The categorization of OSR models is provided along with an extensive summary of recent progress. Additionally, the relationships between OSR and its related tasks including multi-class classification and novelty detection are analyzed. It is concluded that OSR can appropriately deal with unknown instances in the real-world where capturing all possible classes in the training data is not practical. Lastly, applications of OSR are highlighted and some new directions for future research topics are suggested.

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Cited by 1 Pith paper

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  1. Out-of-distribution detection in 3D applications: a review

    cs.CV 2025-07 conditional novelty 4.0 of 10

    A survey of out-of-distribution detection methods for 3D data, covering applications, sensors, benchmarks, evaluation metrics, and open challenges.

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