Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: AdaZoom: Adaptive Zoom Network for Multi-Scale Object Detection in Large
  Scenes   Detection in large-scale scenes is a challenging problem due to small objects
and extreme scale variation. It is essential to focus on the image regions of
small objects. In this paper, we propose a novel Adaptive Zoom (AdaZoom)
network as a selective magnifier with flexible shape and focal length to
adaptively zoom the focus regions for object detection. Based on policy
gradient, we construct a reinforcement learning framework for focus region
generation, with the reward formulated by object distributions. The scales and
aspect ratios of the generated regions are adaptive to the scales and
distribution of objects inside. We apply variable magnification according to
the scale of the region for adaptive multi-scale detection. We further propose
collaborative training to complementarily promote the performance of AdaZoom
and the detection network. To validate the effectiveness, we conduct extensive
experiments on VisDrone2019, UAVDT, and DOTA datasets. The experiments show
AdaZoom brings a consistent and significant improvement over different
detection networks, achieving state-of-the-art performance on these datasets,
especially outperforming the existing methods by AP of 4.64% on Vis-Drone2019.

26
The categories of this paper are: bayes-an
28
The categories of this paper are: alg-geom
2
The categories of this paper are: math
36
The categories of this paper are: cmp-lg
22
The categories of this paper are: chao-dyn
23
The categories of this paper are: solv-int
17
The categories of this paper are: q-fin
29
The categories of this paper are: funct-an
8
The categories of this paper are: hep-ex
7
The categories of this paper are: hep-th
37
The categories of this paper are: supr-con
15
The categories of this paper are: nucl-ex
5
The categories of this paper are: gr-qc
10
The categories of this paper are: q-bio
6
The categories of this paper are: astro-ph
11
The categories of this paper are: hep-lat