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arXiv · 2012.03519

Fine-Grained Dynamic Head for Object Detection

Lin Song·Yanwei Li·Zhengkai Jiang·Zeming Li·Hongbin Sun·Jian Sun·Nanning Zheng
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Abstract

The Feature Pyramid Network (FPN) presents a remarkable approach to alleviate the scale variance in object representation by performing instance-level assignments. Nevertheless, this strategy ignores the distinct characteristics of different sub-regions in an instance. To this end, we propose a fine-grained dynamic head to conditionally select a pixel-level combination of FPN features from different scales for each instance, which further releases the ability of multi-scale feature representation. Moreover, we design a spatial gate with the new activation function to reduce computational complexity dramatically through spatially sparse convolutions. Extensive experiments demonstrate the effectiveness and efficiency of the proposed method on several state-of-the-art detection benchmarks. Code is available at https://github.com/StevenGrove/DynamicHead.

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Lin Song, Yanwei Li, Zhengkai Jiang, Zeming Li, Hongbin Sun, Jian Sun, Nanning Zheng. 2020-12-07. Fine-Grained Dynamic Head for Object Detection. https://arxiv.org/abs/2012.03519

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