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IEICE TRANSACTIONS on Information

Recursive Multi-Scale Channel-Spatial Attention for Fine-Grained Image Classification

Dichao LIU, Yu WANG, Kenji MASE, Jien KATO

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Summary :

Fine-grained image classification is a difficult problem, and previous studies mainly overcome this problem by locating multiple discriminative regions in different scales and then aggregating complementary information explored from the located regions. However, locating discriminative regions introduces heavy overhead and is not suitable for real-world application. In this paper, we propose the recursive multi-scale channel-spatial attention module (RMCSAM) for addressing this problem. Following the experience of previous research on fine-grained image classification, RMCSAM explores multi-scale attentional information. However, the attentional information is explored by recursively refining the deep feature maps of a convolutional neural network (CNN) to better correspond to multi-scale channel-wise and spatial-wise attention, instead of localizing attention regions. In this way, RMCSAM provides a lightweight module that can be inserted into standard CNNs. Experimental results show that RMCSAM can improve the classification accuracy and attention capturing ability over baselines. Also, RMCSAM performs better than other state-of-the-art attention modules in fine-grained image classification, and is complementary to some state-of-the-art approaches for fine-grained image classification. Code is available at https://github.com/Dichao-Liu/Recursive-Multi-Scale-Channel-Spatial-Attention-Module.

Publication
IEICE TRANSACTIONS on Information Vol.E105-D No.3 pp.713-726
Publication Date
2022/03/01
Publicized
2021/12/22
Online ISSN
1745-1361
DOI
10.1587/transinf.2021EDP7166
Type of Manuscript
PAPER
Category
Image Recognition, Computer Vision

Authors

Dichao LIU
  Nagoya University
Yu WANG
  Ritsumeikan University
Kenji MASE
  Nagoya University
Jien KATO
  Ritsumeikan University

Keyword