Awesome

Deep-Rep-MFIR

Official implementation of Deep Reparametrization of Multi-Frame Super-Resolution and Denoising

Publication: Deep Reparametrization of Multi-Frame Super-Resolution and Denoising. Goutam Bhat, Martin Danelljan, Fisher Yu, Luc Van Gool, and Radu Timofte. ICCV 2021 oral [Arxiv]

Note: The code for our CVPR2021 paper "Deep Burst Super-Resolution" is available at goutamgmb/deep-burst-sr

Overview

We propose a deep reparametrization of the maximum a posteriori formulation commonly employed in multi-frame image restoration tasks. Our approach is derived by introducing a learned error metric and a latent representation of the target image, which transforms the MAP objective to a deep feature space. The deep reparametrization allows us to directly model the image formation process in the latent space, and to integrate learned image priors into the prediction. Our approach thereby leverages the advantages of deep learning, while also benefiting from the principled multi-frame fusion provided by the classical MAP formulation. We validate our approach through comprehensive experiments on burst denoising and burst super-resolution datasets. Our approach sets a new state-of-the-art for both tasks, demonstrating the generality and effectiveness of the proposed formulation.

[Classical multi-frame image restoration approaches minimize a reconstruction error between the observed images and the simulated images to obtain the output image y. In contrast, we employ an encoder E to compute the reconstruction error in a learned feature space. The reconstruction error is minimized w.r.t. a latent representation z, which is then passed through the decoder D to obtain the prediction y.]

Table of Contents

• Installation
• Toolkit Overview
• Datasets
• Evaluation
• Model Zoo
• Training
• Acknowledgement

Installation

Clone the Git repository.

git clone https://github.com/goutamgmb/deep-rep.git

Install dependencies

Run the installation script to install all the dependencies. You need to provide the conda install path (e.g. ~/anaconda3) and the name for the created conda environment (here env-deeprep).

bash install.sh conda_install_path env-deeprep

This script will also download the default DeepRep networks and create default environment settings.

Update environment settings

The environment setting file admin/local.py contains the paths for pre-trained networks, datasets etc. Update the paths in local.py according to your local environment.

Toolkit Overview

The toolkit consists of the following sub-modules.

• actors: Contains the actor classes for different trainings. The actor class is responsible for passing the input data through the network can calculating losses.
• admin: Includes functions for loading networks, tensorboard etc. and also contains environment settings.
• data: Contains functions for generating synthetic bursts, camera pipeline, processing data (e.g. loading images, data augmentations).
• data_specs: Information about train/val splits of different datasets.
• dataset: Contains integration of datasets such as BurstSR, SyntheticBurst, ZurichRAW2RGB, OpenImages, Grayscale denoising and Color denoising.
• evaluation: Scripts to run and evaluate models on standard datasets.
• external: External dependencies, e.g. PWCNet.
• models: Contains different layers and network definitions.
• train_settings: Default training settings for different models.
• trainers: The main class which runs the training.
• util_scripts: Util scripts to e.g. download datasets.
• utils: General utility functions for e.g. plotting, data type conversions, loading networks.

Datasets

The toolkit provides integration for following datasets which can be used to train/evaluate the models.

The RGB images from the training split of the Zurich RAW to RGB mapping dataset can be used to generate synthetic bursts for training using the SyntheticBurstProcessing class in data/processing.py.

Preparation: Download the Zurich RAW to RGB canon set from here and unpack the zip folder. Set the zurichraw2rgb_dir variable in admin/local.py to point to the unpacked dataset directory.

The pre-generated synthetic validation set introduced in DBSR for the RAW burst super-resolution task. The dataset contains 300 synthetic bursts, each containing 14 RAW images. The synthetic bursts are generated from the RGB images from the test split of the Zurich RAW to RGB mapping dataset. The dataset can be loaded using SyntheticBurstVal class in dataset/synthetic_burst_val_set.py file.

Preparation: Download the dataset from here and unpack the zip file. Set the synburstval_dir variable in admin/local.py to point to the unpacked dataset directory.

The real-world BurstSR dataset introduced in DBSR for the RAW burst super-resolution task. The dataset contains RAW bursts captured from Samsung Galaxy S8 and corresponding HR ground truths captured using a DSLR camera. This is the pre-processed version of the dataset that contains roughly aligned crops from the original images. The dataset can be loaded using BurstSRDataset class in dataset/burstsr_dataset.py file. Please check the DBSR paper for more details.

Preparation: The dataset has been split into 10 parts and can be downloaded and unpacked using the util_scripts/download_burstsr_dataset.py script. Set the burstsr_dir variable in admin/local.py to point to the unpacked BurstSR dataset directory.

The real-world BurstSR dataset introduced in DBSR for the RAW burst super-resolution task. The dataset contains RAW bursts captured from Samsung Galaxy S8 and corresponding HR ground truths captured using a DSLR camera. This is the raw version of the dataset containing the full burst images in dng format.

Preparation: The dataset can be downloaded and unpacked using the util_scripts/download_raw_burstsr_data.py script.

We use the RGB images from the OpenImages dataset to generate synthetic bursts when training the burst denoising models. The dataset can be loaded using OpenImagesDataset class in dataset/openimages_dataset.py file.

Preparation: Download the dataset from here. Set the openimages_dir variable in admin/local.py to point to the downloaded dataset directory.

The pre-generated synthetic grayscale burst denoising test set introduced in KPN paper. The dataset can be loaded using GrayscaleDenoiseTestSet class in dataset/grayscale_denoise_test_set.py file.

Preparation: Download the dataset from here. Set the kpn_testset_path variable in admin/local.py to point to the downloaded file.

The pre-generated synthetic color burst denoising test set introduced in BPN paper. The dataset can be loaded using ColorDenoiseTestSet class in dataset/color_denoise_test_set.py file.

Preparation: Download the dataset from here and unpack the zip file. Set the bpn_color_testset_dir variable in admin/local.py to point to the unpacked dataset directory.

Evaluation

You can run the trained models on the included datasets and compute the quality of predictions using the evaluation module.

Note: Please prepare the necessary datasets as explained in Datasets section before running the models.

You can evaluate the models on SyntheticBurst validation set using evaluation/synburst package. First create an experiment setting in evaluation/synburst/experiments containing the list of models to evaluate. You can start with the provided setting deeprep_default.py as a reference. Please refer to network_param.py for examples on how to specify a model for evaluation.

Save network predictions

You can save the predictions of a model on bursts from SyntheticBurst dataset by running

python evaluation/synburst/save_results.py EXPERIMENT_NAME

Here, EXPERIMENT_NAME is the name of the experiment setting you want to use (e.g. deeprep_default). The script will save the predictions of the model in the directory pointed by the save_data_path variable in admin/local.py.

Note The network predictions are saved in linear sensor color space (i.e. color space of input RAW burst), as 16 bit pngs.

Compute performance metrics

You can obtain the standard performance metrics (e.g. PSNR, MS-SSIM, LPIPS) using the compute_score.py script

python evaluation/synburst/compute_score.py EXPERIMENT_NAME

Here, EXPERIMENT_NAME is the name of the experiment setting you want to use (e.g. deeprep_default). The script will run the models to generate the predictions and compute the scores. In case you want to compute performance metrics for results saved using save_results.py, you can run compute_score.py with additonal --load_saved argument.

python evaluation/synburst/compute_score.py EXPERIMENT_NAME --load_saved

In this case, the script will load pre-saved predictions whenever available. If saved predictions are not available, it will run the model to first generate the predictions and then compute the scores.

Qualitative comparison

You can perform qualitative analysis of the model by visualizing the saved network predictions, along with ground truth, in sRGB format using the visualize_results.py script.

python evaluation/synburst/visualize_results.py EXPERIMENT_NAME

Here, EXPERIMENT_NAME is the name of the experiment setting containing the list of models you want to use (e.g. deeprep_default). The script will display the predictions of each model in sRGB format, along with the ground truth. You can toggle between images, zoom in on particular image regions using the UI. See visualize_results.py for details.

Note: You need to first save the network predictions using save_results.py script, before you can visualize them using visualize_results.py.

You can evaluate the models on BurstSR validation set using evaluation/burstsr package. First create an experiment setting in evaluation/burstsr/experiments containing the list of models to evaluate. You can start with the provided setting deeprep_default.py as a reference. Please refer to network_param.py for examples on how to specify a model for evaluation.

Save network predictions

You can save the predictions of a model on bursts from BurstSR val dataset by running

python evaluation/burstsr/save_results.py EXPERIMENT_NAME

Here, EXPERIMENT_NAME is the name of the experiment setting you want to use (e.g. deeprep_default). The script will save the predictions of the model in the directory pointed by the save_data_path variable in admin/local.py.

Note The network predictions are saved in linear sensor color space (i.e. color space of input RAW burst), as 16 bit pngs.

Compute performance metrics

You can obtain the standard performance metrics (e.g. PSNR, MS-SSIM, LPIPS) after spatial and color alignment (see paper for details) using the compute_score.py script

python evaluation/burstsr/compute_score.py EXPERIMENT_NAME

Here, EXPERIMENT_NAME is the name of the experiment setting you want to use (e.g. deeprep_default). The script will run the models to generate the predictions and compute the scores. In case you want to compute performance metrics for results saved using save_results.py, you can run compute_score.py with additonal --load_saved argument.

python evaluation/burstsr/compute_score.py EXPERIMENT_NAME --load_saved

In this case, the script will load pre-saved predictions whenever available. If saved predictions are not available, it will run the model to first generate the predictions and then compute the scores.

Qualitative comparison

You can perform qualitative analysis of the model by visualizing the saved network predictions, along with ground truth, in sRGB format using the visualize_results.py script.

python evaluation/burstsr/visualize_results.py EXPERIMENT_NAME

Here, EXPERIMENT_NAME is the name of the experiment setting containing the list of models you want to use (e.g. deeprep_default). The script will display the predictions of each model in sRGB format, along with the ground truth. You can toggle between images, zoom in on particular image regions using the UI. See visualize_results.py for details.

Note: You need to first save the network predictions using save_results.py script, before you can visualize them using visualize_results.py.

You can evaluate the models on Grayscale and Color denoising test sets using evaluation/burst_denoise package. First create an experiment setting in evaluation/burst_denoise/experiments containing the list of models to evaluate. You can start with the provided setting deeprep_color.py as a reference. Please refer to network_param.py for examples on how to specify a model for evaluation.

Save network predictions

You can save the predictions of a model on bursts from Grayscale/Color denoising datasets by running

python evaluation/burst_denoise/save_results.py EXPERIMENT_NAME MODE NOISE_LEVEL

Here, EXPERIMENT_NAME is the name of the experiment setting you want to use (e.g. deeprep_default). MODE denotes which dataset to use (can be color or grayscale). NOISE_LEVEL denotes the noise level to use (can be 1, 2, 4, 8, or all). The script will save the predictions of the model in the directory pointed by the save_data_path variable in admin/local.py.

Note The network predictions are saved in linear color space (i.e. color space of input burst), as 16 bit pngs.

Compute performance metrics

You can obtain the standard performance metrics (e.g. PSNR, MS-SSIM, LPIPS) using the compute_score.py script

python evaluation/burst_denoise/compute_score.py EXPERIMENT_NAME MODE NOISE_LEVEL

Here, EXPERIMENT_NAME is the name of the experiment setting you want to use (e.g. deeprep_default). MODE denotes which dataset to use (can be color or grayscale). NOISE_LEVEL denotes the noise level to use (can be 1, 2, 4, 8, or all). The script will run the models to generate the predictions and compute the scores. In case you want to compute performance metrics for results saved using save_results.py, you can run compute_score.py with additonal --load_saved argument.

python evaluation/burst_denoise/compute_score.py EXPERIMENT_NAME MODE NOISE_LEVEL --load_saved

In this case, the script will load pre-saved predictions whenever available. If saved predictions are not available, it will run the model to first generate the predictions and then compute the scores.

Qualitative comparison

You can perform qualitative analysis of the model by visualizing the saved network predictions, along with ground truth, using the visualize_results.py script.

python evaluation/burst_denoise/visualize_results.py EXPERIMENT_NAME MODE NOISE_LEVEL

Here, EXPERIMENT_NAME is the name of the experiment setting containing the list of models you want to use (e.g. deeprep_default). MODE denotes which dataset to use (can be color or grayscale). NOISE_LEVEL denotes the noise level to use (can be 1, 2, 4, 8, or all). The script will display the predictions of each model, along with the ground truth. You can toggle between images, zoom in on particular image regions using the UI. See visualize_results.py for details.

Note: You need to first save the network predictions using save_results.py script, before you can visualize them using visualize_results.py.

Model Zoo

Here, we provide pre-trained network weights and report their performance.

Note: The models have been retrained using the cleaned up code, and thus can have small performance differences compared to the models used for the paper.

The models are evaluated using all 14 burst images.

The models are evaluated using all 14 burst images. The metrics are computed after spatial and color alignment, as described in DBSR paper.

The models are evaluated using all 8 burst images.

The models are evaluated using all 8 burst images.

Training

You can train the models using the run_training.py script. Please download and set up the necessary datasets as described in Datasets section, before starting the trainings. You will also need a pre-trained PWC-Net model to start the trainings. The model is automatically downloaded from the install.sh script. You can also download it manually using

gdown https://drive.google.com/uc\?id\=1s11Ud1UMipk2AbZZAypLPRpnXOS9Y1KO -O pretrained_networks/pwcnet-network-default.pth

You can train a model using the following command

python run_training.py MODULE_NAME PARAM_NAME

Here, MODULE_NAME is the name of the training module (e.g. deeprep), while PARAM_NAME is the name of the parameter setting file (e.g. sr_synthetic_default). We provide the default training settings used to obtain the results in the ICCV paper.

• sr_synthetic_default: Train RAW burst super-resolution model on synthetic bursts.
• sr_burstsr_default: Train RAW burst super-resolution model on real-world BurstSR.
• denoise_grayscale_pwcnet: Train grayscale burst denoising model using pre-trained PWC-Net.
• denoise_color_pwcnet: Train color burst denoising model using pre-trained PWC-Net.
• denoise_grayscale_customflow: Train grayscale burst denoising model using a custom optical flow network.
• denoise_color_customflow: Train color burst denoising model using a custom optical flow network.

Acknowledgement

The toolkit uses code from the following projects:

• Correlation module from ClementPinard/Pytorch-Correlation-extension.
• Forward and inverse camera pipeline code from timothybrooks/unprocessing.
• PWC-Net code from sniklaus/pytorch-pwc
• PWC-Net pre-trained models from NVlabs/PWC-Net
• MS-SSIM code from jorge-pessoa/pytorch-msssim.
• Core code for the toolkit (e.g. saving and loading models) from visionml/pytracking