Direction-aware Spatial Context Features for Shadow Detection (and Removal)

by Xiaowei Hu, Chi-Wing Fu, Lei Zhu, Jing Qin and Pheng-Ann Heng

This implementation is written by Xiaowei Hu at the Chinese University of Hong Kong.

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Citation

@InProceedings{Hu_2018_CVPR,
     author = {Hu, Xiaowei and Zhu, Lei and Fu, Chi-Wing and Qin, Jing and Heng, Pheng-Ann},
     title = {Direction-Aware Spatial Context Features for Shadow Detection},
     booktitle = {The IEEE Conference on Computer Vision and Pattern Recognition (CVPR)},
     pages={7454--7462},
     year = {2018}
}

@article{hu2018direction,
     author = {Hu, Xiaowei and Fu, Chi-Wing and Zhu, Lei and Qin, Jing and Heng, Pheng-Ann},
     title = {Direction-aware Spatial Context Features for Shadow Detection and Removal},
     journal={arXiv preprint arXiv:1805.04635},
     year = {2018}
}

Results

The results of shadow detection on SBU and UCF can be found at Google Drive.
The results of shadow detection on new split of UCF (used by some works) can be found at Google Drive; BER: 10.38, accuracy: 0.95.

Installation

1. Please download and compile our CF-Caffe.

2. Clone the DSC repository, and we'll call the directory that you cloned as DSC-master.

   git clone https://github.com/xw-hu/DSC.git

3. Replace CF-Caffe/examples/ by DSC-master/examples/. Replace CF-Caffe/data/ by DSC-master/data/.

Test

Shadow Detection

1. Please download our pretrained model at Google Drive.
   Put this model in examples/DSC/DSC_detection/snapshot/.

2. (Matlab User) Enter the examples/DSC/ and run test_detection.m in Matlab.

3. (Python User) Enter the examples/DSC/DSC_detection/ and export PYTHONPATH in the command window such as:

   export PYTHONPATH='../../../python'

   Run the test model and resize the results to the size of original images:

   ipython notebook DSC_test.ipynb

4. Apply CRF to do the post-processing for each image.
   The code for CRF can be found in https://github.com/Andrew-Qibin/dss_crf
   *Note that please provide a link to the original code as a footnote or a citation if you plan to use it.

Shadow Removal

Enter the examples/DSC/ and run test_removal.m in Matlab.

Train

Download the pre-trained VGG16 model at http://www.robots.ox.ac.uk/~vgg/research/very_deep/.
Put this model in CF-Caffe/models/

Shadow Detection

1. Enter the examples/DSC/DSC_detection/
   Modify the image path in DSC.prototxt.

2. Run

   sh train.sh

Shadow Removal

1. Color compensation mechanism:
   Enter the /data/SRD/ or /data/ISTD/.
   Run color_transfer_function.m in Matlab.

2. Transfer the images into the LAB color sapce and do the data argumentation:
   Enter the /data/SRD/ or /data/ISTD/.
   Run ToLab.m and data_argument.m in Matlab.

3. Enter the examples/DSC/DSC_removal_SRD/ or examples/DSC/DSC_removal_ISTD/.
   Modify the image path in DSC.prototxt.

4. Run

   sh train.sh