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Multi-Scale Photo Exposure Correction

version 1.0.1 (31.6 MB) by Mahmoud Afifi
Project page of the paper "Learning Multi-Scale Photo Exposure Correction" (CVPR 2021).

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Updated 14 Aug 2021

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Learning Multi-Scale Photo Exposure Correction

Mahmoud Afifi1,2, Konstantinos G. Derpanis1, Björn Ommer3, and Michael S. Brown1

1Samsung AI Center (SAIC) - Toronto    2York University    3Heidelberg University

teaser

Project page of the paper Learning Multi-Scale Photo Exposure Correction. Mahmoud Afifi, Konstantinos G. Derpanis, Björn Ommer, and Michael S. Brown. In CVPR, 2021. If you use this code or our dataset, please cite our paper:

@inproceedings{afifi2021learning,
  title={Learning Multi-Scale Photo Exposure Correction},
  author={Afifi, Mahmoud and Derpanis, Konstantinos G, and Ommer, Bj{\"o}rn and Brown, Michael S},
  booktitle={Proceedings of the IEEE Conference on Computer Vision and Pattern Recognition},
  year={2021}
}

Dataset

dataset_figure

Download our dataset from the following links: Training | Validation | Testing | Our results

As the dataset was originally rendered using raw images taken from the MIT-Adobe FiveK dataset, our dataset follows the original license of the MIT-Adobe FiveK dataset.

Code

Prerequisite

  1. Matlab 2019b or higher (tested on Matlab 2019b)
  2. Deep Learning Toolbox

Get Started

Run install_.m

Demos:

  1. Run demo_single_image.m or demo_image_directory.m to process a single image or image directory, respectively. If you run the demo_single_image.m, it should save the result in ../result_images and output the following figure:

exposure_demo

  1. Run demo_GUI.m for a gui demo.

We provide a way to interactively control the output results by scaling each layer of the Laplacian pyramid before feeding them to the network. This can be controlled from the S variable in demo_single_image.m or demo_image_directory.m or from the GUI demo. Each scale factor in the S vector is multiplied by the corresponding pyramid level.

Additional post-processing options include fusion and histogram adjustment that can be turned on using the fusion and pp variables, respectively in demo_single_image.m or demo_image_directory.m. These options are also available in the GUI demo. Note that none of the fusion and pp options was used in producing our results in the paper, but they can improve the quality of results in some cases as shown below.

fusion

Training:

We train our model end-to-end to minimize: reconstruction loss, Laplacian pyramid loss, and adversarial loss. We trained our model on patches randomly extracted from training images with different dimensions. We first train on patches of size 128×128 pixels. Next, we continue training on 256×256 patches, followed by training on 512×512 patches.

exposure_training

Before starting, run src/patches_extraction.m to extract random patches with different dimensions -- adjust training/validation image directories before running the code. In the given code, the dataset is supposed to be located in the exposure_dataset folder in the root directory. The exposure_dataset should include the following directories:

- exposure_dataset/
         training/
              INPUT_IMAGES/
              GT_IMAGES/
         validation/
              INPUT_IMAGES/
              GT_IMAGES/

The src/patches_extraction.m will create subdirectories with patches extracted from each image and its corresponding ground-truth at different resolutions as shown below.

patch_extraction

After extracting the training patches, run main_training.m to start training -- adjust training/validation image directories before running the code. All training options are available in the main_training.m.

Results

exposure_results_1 exposure_results_2 exposure_results_3

This software is provided for research purposes only and CANNOT be used for commercial purposes.

Maintainer: Mahmoud Afifi (m.3afifi@gmail.com)

Related Research Projects

Cite As

Mahmoud Afifi, Konstantinos G. Derpanis, Bjorn Ommer, and Michael S. Brown. Learning Multi-Scale Photo Exposure Correction. In Proceedings of the IEEE/CVF Conference on Computer Vision and Pattern Recognition, 2021.

MATLAB Release Compatibility
Created with R2019b
Compatible with R2019b and later releases
Platform Compatibility
Windows macOS Linux

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To view or report issues in this GitHub add-on, visit the GitHub Repository.
To view or report issues in this GitHub add-on, visit the GitHub Repository.