Dense Deep Unfolding Network with 3D-CNN Prior for Snapshot Compressive Imaging [PyTorch]

This repository is the code for the following paper:

Zhuoyuan Wu, Jian Zhang, Chong Mou. Dense Deep Unfolding Network with 3D-CNN Prior for Snapshot Compressive Imaging. ICCV 2021. [PDF]


Snapshot compressive imaging (SCI) aims to record three-dimensional signals via a two-dimensional camera. For the sake of building a fast and accurate SCI recovery algorithm, we incorporate the interpretability of model-based methods and the speed of learning-based ones and present a novel dense deep unfolding network (DUN) with 3D-CNN prior for SCI, where each phase is unrolled from an iteration of Half-Quadratic Splitting (HQS). To better exploit the spatial-temporal correlation among frames and address the problem of information loss between adjacent phases in existing DUNs, we propose to adopt the 3D-CNN prior in our proximal mapping module and develop a novel dense feature map (DFM) strategy, respectively. Besides, in order to promote network robustness, we further propose a dense feature map adaption (DFMA) module to allow inter-phase information to fuse adaptively. All the parameters are learned in an end-to-end fashion. Extensive experiments on simulation data and real data verify the superiority of our method.


Figure 1: Illustration of the video SCI (left) and our proposed framework (right) .


$ conda install pytorch=1.4
$ conda install torchvision
$ conda install scikit-image
$ conda install -c menpo opencv
$ conda install -c conda-forge tensorboardx 
$ pip install --extra-index-url nvidia-dali==0.22.0
$ git clone
$ cd apex
$ python install


Download our trained model from the Google Drive and place it under the checkpoint folder.

Test on the simulation data:

python --test_dir ./simulation_dataset --result ./checkpoint/net_200.pth --layer_num 10 --temporal_patch 3 --n_channels 1


Download the DAVIS dataset from the Google Drive

export OMP_NUM_THREADS="4"

python -m torch.distributed.launch --nproc_per_node=4 --batch_size 4 --learning_rate 4e-6 --max_number_patches 25600  --patch_size 128 --n_channels 1 --layer_num 10  --warmup_steps 5 --opt-level O1 --end_epoch 200 --algo_name 3DCN_RFMA_layer10 --sRGB_path ./DAVIS-train-mp4 --test_path ./simulation_data

OMP_NUM_THREADS means the number of process started for each GPU. –nproc_per_node is the number of GPUs




If you find the code helpful in your resarch or work, please cite the following paper.

  title={Dense Deep Unfolding Network with 3D-CNN Prior for Snapshot Compressive Imaging},
  author={Wu, Zhuoyuan and Zhang, Jian and Mou, Chong},
  booktitle={IEEE International Conference on Computer Vision (ICCV)},