"Feature Map Distillation of Thin Nets for Low-Resolution Object Recogn" by Zhenhua Huang, Shunzhi Yang et al.
 

Feature Map Distillation of Thin Nets for Low-Resolution Object Recognition

Document Type

Article

Publication Date

1-1-2022

Abstract

Intelligent video surveillance is an important computer vision application in natural environments. Since detected objects under surveillance are usually low-resolution and noisy, their accurate recognition represents a huge challenge. Knowledge distillation is an effective method to deal with it, but existing related work usually focuses on reducing the channel count of a student network, not feature map size. As a result, they cannot transfer -privilege information hidden in feature maps of a wide and deep teacher network into a thin and shallow student one, leading to the latter's poor performance. To address this issue, we propose a Feature Map Distillation (FMD) framework under which the feature map size of teacher and student networks is different. FMD consists of two main components: Feature Decoder Distillation (FDD) and Feature Map Consistency-enforcement (FMC). FDD reconstructs the shallow texture features of a thin student network to approximate the corresponding samples in a teacher network, which allows the high-resolution ones to directly guide the learning of the shallow features of the student network. FMC makes the size and direction of each deep feature map consistent between student and teacher networks, which constrains each pair of feature maps to produce the same feature distribution. FDD and FMC allow a thin student network to learn rich -privilege information in feature maps of a wide teacher network. The overall performance of FMD is verified in multiple recognition tasks by comparing it with state-of-the-art knowledge distillation methods on low-resolution and noisy objects.

Identifier

85123312945 (Scopus)

Publication Title

IEEE Transactions on Image Processing

External Full Text Location

https://doi.org/10.1109/TIP.2022.3141255

e-ISSN

19410042

ISSN

10577149

PubMed ID

35025743

First Page

1364

Last Page

1379

Volume

31

Grant

10.13039/501100001809

Fund Ref

National Natural Science Foundation of China

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