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Coarse-to-fine-weakly-supervised-GPC-segmentation

Title: A coarse-to-fine weakly supervised learning method for green plastic cover segmentation using high-resolution remote sensing images

Author: Yinxia Cao, Xin Huang

Author affiliation: School of Remote Sensing and Information Engineering, Wuhan University, Wuhan 430079, PR China

Journal: ISPRS Journal of Photogrammetry and Remote Sensing

Paper state: accepted on 4.14, 2022

Getting Started

Prerequisites

python >=3.6
pytorch >= 1.7.0 (lower version may be also work)
GPU: NVIDIA GTX 1080 Ti GPU (11G memory)

Prepare datasets

Google earth images download steps:

  1. Add a XYZ tile in the browser panel and load the created link to QGIS
    For google earth images, a available link for XYZ connection is https://mt1.google.com/vt/lyrs=s&x={x}&y={y}&z={z}.
  2. Make your own image-level labels:
create a vector file (shp)   
add positive (negative) sample points
  1. open the python console in QGIS.
  2. Run the following code and change the path of the created vector file.
python tttcls_google_gpc/qgis_download_google.py

image image
To do: organize the datasets and release it hopefully.

Model development

The workflow of the proposed method is as follows:
image

One-by-one step

Step 1: training the classification network and generating grad-cam++ maps

cd tttcls_google_gpc
python train_regent040_0.6_balance.py
python generate_cam_balance.py

Step 2: applying unsupervised segmentation to images
refer to the link
revise the input path and then run the following code. Note that two versions were provided.
There is little difference between the two versions. We just used the v1 in the paper.

ptyhon generate_unsupervised_segmentation_v1.py # for RGB images (8bit)
[or python generate_unsupervised_segmentation_v2.py] # for multi-spectral images

Step 3: generating object-based CAM and applying otsu thresholding. see the matlab file: demo_gen_cues_train_labels.m. The basic idea is simple, i.e., calculating the mean values of each object from step 2 and then applying the otsu method to obtain the binary pixel-level mask (1: foreground, 0: background).

run demo_gen_cues_train_labels.m

Step 4: carrying out segmentation with the binary mask from step 3

cd tttseg_google_gpc
python train_regnet040_0.6_update.py

Acknowledgement

We used the package "segmentation_models_pytorch" and "pytorch-grad-cam".
Thanks for their contributions.

@misc{Yakubovskiy:2019,
  Author = {Pavel Yakubovskiy},
  Title = {Segmentation Models Pytorch},
  Year = {2020},
  Publisher = {GitHub},
  Journal = {GitHub repository},
  Howpublished = {\url{https://github.com/qubvel/segmentation_models.pytorch}}
}
@misc{jacobgilpytorchcam,
  title={PyTorch library for CAM methods},
  author={Jacob Gildenblat and contributors},
  year={2021},
  publisher={GitHub},
  howpublished={\url{https://github.com/jacobgil/pytorch-grad-cam}},
}

License

This project is licensed under the MIT License - see the LICENSE.md file for details