This is the official repository of JSI-GAN (AAAI2020).

We provide the training and test code along with the trained weights and the dataset (train+test) used for JSI-GAN. If you find this repository useful, please consider citing our paper.

Reference:

Soo Ye Kim*, Jihyong Oh*, and Munchurl Kim "JSI-GAN: GAN-Based Joint Super-Resolution and Inverse Tone-Mapping with Pixel-Wise Task-Specific Filters for UHD HDR Video", Thirty-Fourth AAAI Conference on Artificial Intelligence, 2020. (* equal contribution)

Our code is implemented using Tensorflow, and was tested under the following setting:

• Python 3.6
• Tensorflow 1.13
• CUDA 9.0
• cuDNN 7.1.4
• NVIDIA TITAN Xp GPU
• Windows 10

1. Download the source code in a directory of your choice <source_path>.
2. Download the test dataset from this link and unzip the 'test' folder in <source_path>/data.
3. Download the pre-trained weights from this link and place the folders in <source_path>/checkpoint_dir.
4. Run main.py with the following options in parse_args:
   (i) For testing the .mat file input with scale factor 2:
   '--phase' as 'test_mat', '--scale_factor' as 2, '--test_data_path_LR_SDR' as './data/test/testset_SDR_x2.mat', '--test_data_path_HR_HDR' as './data/test/testset_HDR.mat'
   (ii) For testing the .mat file input with scale factor 4:
   '--phase' as 'test_mat', '--scale_factor' as 4, '--test_data_path_LR_SDR' as './data/test/testset_SDR_x4.mat', '--test_data_path_HR_HDR' as './data/test/testset_HDR.mat'
   (iii) For testing the .png file input with scale factor 2:
   '--phase' as 'test_png', '--scale_factor' as 2, '--test_data_path_LR_SDR' as './data/test/PNG/SDR_x2', '--test_data_path_HR_HDR' as './data/test/PNG/HDR'
   (iv) For testing the .mat file input with scale factor 4:
   '--phase' as 'test_png', '--scale_factor' as 4, '--test_data_path_LR_SDR' as './data/test/PNG/SDR_x4', '--test_data_path_HR_HDR' as './data/test/PNG/HDR'

• Running the test_mat option will read the .mat file and save the predicted HR HDR results in .png format in <source_path>/test_img_dir. The YUV channels are saved separately as 16-bit PNG files.
• Running the test_png option will read .png files in the designated folder and save the predicted HR HDR results in .png format in <source_path>/test_img_dir. The YUV channels are saved separately as 16-bit PNG files.
• If you wish to convert the produced .png files to a .yuv video, you could run the provided PNGtoYUV.m Matlab code, which would save the .yuv video in the same location as the .png files. Please set the directory name accordingly. (Encoding the raw .yuv video to a compressed video format such as .mp4 can be done using ffmpeg)
• If you wish to test your own LR SDR .png files, you can designate a folder of your choice as the option for '--test_data_path_LR_SDR' and '--test_data_path_HR_HDR'.
• If you do not have the HR HDR ground truth, you could comment the lines related to 'label', 'GT' and 'PSNR' in the test_png function in net.py.
• For faster testing (to acquire PSNR results), you may comment the line for saving the predicted images as .png files.
• Due to GPU memory constraints, the full 4K frame may fail to be tested at one go. The '--test_patch' option defines the number of patches (H, W) to divide the input frame (e.g. (1, 1) means the full 4K frame will be entered, (2, 2) means that it will be divided into 2x2 2K frame patches and processed serially). You may modify this variable so that the testing works with your GPU.

1. Download the source code in a directory of your choice <source_path>.
2. Download the train dataset from this link and unzip the 'train' folder in <source_path>/data.
3. Run main.py with the following options in parse_args:
   (i) For training the model with scale factor 2:
   '--phase' as 'train', '--scale_factor' as 2, '--train_data_path_LR_SDR' as './data/train/SDR_youtube_80.mat', '--train_data_path_HR_HDR' as './data/train/HDR_youtube_80.mat'
   (ii) For training the model with scale factor 4:
   '--phase' as 'train', '--scale_factor' as 4, '--train_data_path_LR_SDR' as './data/train/SDR_youtube_80_x4.mat', '--train_data_path_HR_HDR' as './data/train/HDR_youtube_80.mat'

• Running the train option will train JSI-GAN with the proposed training scheme (training JSInet first and then fine-tuning JSI-GAN) and save the trained weights in <source_path>/checkpoint_dir.
• The trained model can be tested with test_mat or test_png options.
• If you wish to compare with the provided weights, change the '--exp_num' option before training to another number than 1 to avoid overwriting the provided pre-trained weights so that the new weights are saved in a different folder (e.g. JSI-GAN_x2_exp2).
• The training process can be monitored using Tensorboard. The log directory for using Tensorboard is <source_path>/logs.

Please contact us via email ([email protected] or [email protected]) for any problems regarding the released code.

The source code is free for research and education use only. Any commercial use should get formal permission first.