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Beyond Bounding-Box: Convex-hull Feature Adaptation for Oriented and Densely Packed Object Detection.(CVPR2021)

Introduction

Detecting oriented and densely packed objects remains challenging for spatial feature aliasing caused by the intersection of reception fields between objects. In this paper, we propose a convex-hull feature adaptation (CFA) approach for configuring convolutional features in accordance with oriented and densely packed object layouts. CFA is rooted in convex-hull feature representation, which defines a set ofdynamically predicted feature points guided by the convex intersection over union (CIoU) to bound the extent of objects. CFA pursues optimal feature assignment by constructing convex-hull sets and dynamically splitting positive or negative convex-hulls. By simultaneously considering overlapping convex-hulls and objects and penalizing convex-hulls shared by multiple objects, CFA alleviates spatial feature aliasing towards optimal feature adaptation. Experiments on DOTA and SKU110KR datasets show that CFA significantly outperforms the baseline approach, achieving new state-of-the-art detec- tion performance.

Motivation

The framework of the CFA is shown as following:

Framework

Installation

Detection framework is based on the MMDetection v1.1.0.

Please refer to the Installation of MMDetection to complete the code environment.

Dataset

Please refer to DOTA to get the training, validation and test set.

Before training, the image-splitting process must be carried out. Check the DOTA_devkit.

Visualization Demo

We upload some validation images in demo/demo_datasets for visualization.

The detection results for these images is saved in demo/bbox_predict.pkl.

Use Jupyter Notebook to run demo/demo.ipynb to visualize the results.

Training and Inference

Create a training and inference shell script contains following command.

export OMP_NUM_THREADS=1
export CUDA_VISIBLE_DEVICES=0
GPUS=1

DIR=path_to_save_model
CONFIG=dota_configs/beyond_bounding_boxes_demo.py
./tools/dist_train.sh ${CONFIG} ${GPUS} --work_dir ${DIR} --gpus ${GPUS} --autoscale
./tools/dist_test.sh ${CONFIG} ${DIR}/latest.pth ${GPUS} --out ${DIR}/bbox_predict.pkl

Evaluation

DOTA_devkit supplies the evalution details.

Citing

@inproceedings{Guo_2021CVPR_CFA,
  author    = {Zonghao Guo, Chang Liu, Xiaosong Zhang, Jianbin Jiao, Xiangyang Ji and Qixiang Ye},
  title     = {Beyond Bounding-Box: Convex-hull Feature Adaptation for Oriented and Densely Packed Object Detection},
  booktitle = {IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR)},
  month     = {June},
  year      = {2021}
}