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Open AccessArticle

Hierarchical Open-Set Object Detection in Unseen Data

1
Intelligence Technology Lab, Inha University, 100 Inha-Ro, Nam Gu, Incheon 22212, Korea
2
KT R&D Center, 151 Taebong-ro, Seocho-gu, Seoul 06763, Korea
*
Author to whom correspondence should be addressed.
Symmetry 2019, 11(10), 1271; https://doi.org/10.3390/sym11101271
Received: 22 September 2019 / Revised: 4 October 2019 / Accepted: 4 October 2019 / Published: 11 October 2019
In this paper, we propose an open-set object detection framework based on a dynamic hierarchical structure with incremental learning capabilities for unseen object classes. We were motivated by the observation that deep features extracted from visual objects show a strong hierarchical clustering property. The hierarchical feature model (HFM) was used to learn a new object class by using collaborative sampling (CS), and open-set-aware active semi-supervised learning (ASSL) algorithms. We divided object proposals into superclasses by using the agglomerative clustering algorithm. Data samples in each superclass node were classified into multiple augmented class nodes instead of directly associating with regular object classes. One or more augmented class nodes are related to a regular object class, and each augmented class has only one superclass. Object proposals from inexperienced data distribution are assigned to an augmented class node. Dynamic HFM nodes in the decision path are assembled to constitute an ensemble prediction, and the new augmented object is associated with a new regular object class. Our experimental results showed that the proposed method uses standard benchmark datasets such as PASCAL VOC, MS COCO, ILSVRC DET, and local datasets to perform better than state-of-the-art techniques. View Full-Text
Keywords: object detection; deep learning; convolutional neural network; active learning object detection; deep learning; convolutional neural network; active learning
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Kim, Y.H.; Shin, D.K.; Ahmed, M.U.; Rhee, P.K. Hierarchical Open-Set Object Detection in Unseen Data. Symmetry 2019, 11, 1271.

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