This is an implementation of CenterNet for object detection on keras and Tensorflow. The project is based on fizyr/keras-retinanet and the official implementation xingyizhou/CenterNet. Thanks for their hard work.

The network is anchor-free. It is quite simple, fast and accurate.

1. I trained on Pascal VOC2012 trainval.txt + Pascal VOC2007 train.txt, and validated on Pascal VOC2007 val.txt. There are 14041 images for training and 2510 images for validation.
2. The best evaluation results (score_threshold=0.01, flip_test=True, nms=True) on VOC2007 test are:

3. The weights of resnet backbones can be downloaded from fizyr/keras-models.
   Pretrained centernet model is here. baidu netdisk extract code: pti9 google driver
4. python3 inference.py to test your image by specifying image path and model path there.

• Download VOC2007 and VOC2012, copy all image files from VOC2007 to VOC2012.
• Append VOC2007 train.txt to VOC2012 trainval.txt.
• Overwrite VOC2012 val.txt by VOC2007 val.txt.

• STEP1: python3 train.py --freeze-backbone --gpu 0 --random-transform --compute-val-loss --batch-size 32 --steps 1000 pascal datasets/VOC2012 to start training. The init lr is 1e-3 and decays to 1e-4 when loss stops dropping down.
• STEP2: python3 train.py --snapshot xxx.h5 --gpu 0 --random-transform --compute-val-loss --batch-size 32 --steps 1000 pascal datasets/VOC2012 to start training when val mAP can not increase during STEP1. The init lr is 1e-4 and decays to 1e-5 when loss stops dropping down.

• python3 eval/common.py to evaluate by specifying model path there.

This project is released under the Apache License. Some parts are borrowed from fizyr/keras-retinanet and xingyizhou/CenterNet. Please take their licenses into consideration too when use this project.