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Anisotropic Convolution for Image Classification
Li, Wenjuan; Li, Bing; Yuan, Chunfeng; Li, Yangxi; Wu, Haohao; Hu, Weiming; Wang, Fangshi

Convolutional neural networks are built upon simple but useful convolution modules. The traditional convolution has a limitation on feature extraction and object localization due to its fixed scale and geometric structure. Besides, the loss of spatial information also restricts the networks' performance and depth. To overcome these limitations, this paper proposes a novel anisotropic convolution by adding a scale factor and a shape factor into the traditional convolution. The anisotropic convolution augments the receptive fields flexibly and dynamically depending on the valid sizes of objects. In addition, the anisotropic convolution is a generalized convolution. The traditional convolution, dilated convolution and deformable convolution can be viewed as its special cases. Furthermore, in order to improve the training efficiency and avoid falling into a local optimum, this paper introduces a simplified implementation of the anisotropic convolution. The anisotropic convolution can be applied to arbitrary convolutional networks and the enhanced networks are called ACNs (anisotropic convolutional networks). Experimental results show that ACNs achieve better performance than many state-of-the-art methods and the baseline networks in tasks of image classification and object localization, especially in classification task of tiny images.

KeywordAnisotropic convolution image classification object localization
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Document Type期刊论文
Affiliation1.National Laboratory of Pattern Recognition, Institute of Automation, Chinese Academy of Sciences
2.PeopleAI, Inc.
3.the State Key Laboratory of Communication Content Cognition, People’s Daily Online
4.National Computer Network Emergency Response Technical Team/Coordination Center of China (CNCERT/CC)
5.School of Software Engineering, Beijing Jiaotong University
6.CAS Center for Excellence in Brain Science and Intelligence Technology, Chinese Academy of Sciences
7.School of Artificial Intelligence, University of Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Li, Wenjuan,Li, Bing,Yuan, Chunfeng,et al. Anisotropic Convolution for Image Classification[J]. IEEE TRANSACTIONS ON IMAGE PROCESSING,2020,29(99):5584-5595.
APA Li, Wenjuan.,Li, Bing.,Yuan, Chunfeng.,Li, Yangxi.,Wu, Haohao.,...&Wang, Fangshi.(2020).Anisotropic Convolution for Image Classification.IEEE TRANSACTIONS ON IMAGE PROCESSING,29(99),5584-5595.
MLA Li, Wenjuan,et al."Anisotropic Convolution for Image Classification".IEEE TRANSACTIONS ON IMAGE PROCESSING 29.99(2020):5584-5595.
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