Re-identification (re-ID) of maritime vessels plays an important role in marine surveillance, but remains highly unexplored due to the lack of large-scale annotated datasets. In vessel re-ID, contrastive methods are supposed to learn discriminative representation from unlabeled vessel images in an unsupervised manner. However, directly introducing classical instance-level contrastive methods to maritime vessel re-ID suffers from the difficulty of finding vessel images with the same pseudo label as positive images, which potentially leads to inefficient training and unsatisfactory performance. This paper proposes a simple but effective method to solve such a hard positive problem. Our method takes all images in an intra-batch cluster as positives and excludes them from the set of negative samples when computing instance-level contrastive loss. Based on this strategy, we construct a multi-level contrastive learning (MCL) framework for vessel re-ID trained with the specifically designed intra-batch cluster-level contrastive loss along with the instance-level one. Experiments on a newly proposed dataset consisting of 1,248 vessel identities show that MCL achieves the state-of-the-art performance compared with other unsupervised methods.


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    Title :

    Unsupervised Maritime Vessel Re-Identification With Multi-Level Contrastive Learning


    Contributors:
    Zhang, Qian (author) / Zhang, Mingxin (author) / Liu, Jinghe (author) / He, Xuanyu (author) / Song, Ran (author) / Zhang, Wei (author)


    Publication date :

    2023-05-01


    Size :

    1864386 byte




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English



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