DSLR-Quality Photos on Mobile Devices with Deep Convolutional Networks

1. Overview [paper] [project webpage]

The provided code implements the paper that presents an end-to-end deep learning approach for translating ordinary photos from smartphones into DSLR-quality images. The learned model can be applied to photos of arbitrary resolution, while the methodology itself is generalized to any type of digital camera. More visual results can be found here.

2. Prerequisites

• Python + scipy, numpy packages
• TensorFlow (>=1.0.1) + CUDA CuDNN
• Nvidia GPU

3. First steps

• Download the pre-trained VGG-19 model and put it into vgg_pretrained/ folder
• Download DPED dataset (patches for CNN training) and extract it into dped/ folder.
  _{This folder should contain three subolders: sony/, iphone/ and blackberry/}

4. Train the model

python train_model.py model=<model>

Obligatory parameters:

model: iphone, blackberry or sony

Optional parameters and their default values:

batch_size: 50   -   batch size [smaller values can lead to unstable training]
train_size: 30000   -   the number of training patches randomly loaded each eval_step iterations
eval_step: 1000   -   each eval_step iterations the model is saved and the training data is reloaded
num_train_iters: 20000   -   the number of training iterations
learning_rate: 5e-4   -   learning rate
w_content: 10   -   the weight of the content loss
w_color: 0.5   -   the weight of the color loss
w_texture: 1   -   the weight of the texture [adversarial] loss
w_tv: 2000   -   the weight of the total variation loss
dped_dir: dped/   -   path to the folder with DPED dataset
vgg_dir: vgg_pretrained/imagenet-vgg-verydeep-19.mat   -   path to the pre-trained VGG-19 network

Example:

python train_model.py model=iphone batch_size=50 dped_dir=dped/ w_color=0.7

5. Test the provided pre-trained models

python test_model.py model=<model>

Obligatory parameters:

model: iphone_orig, blackberry_orig or sony_orig

Optional parameters:

test_subset: full,small   -   all 29 or only 5 test images will be processed
resolution: orig,high,medium,small,tiny   -   the resolution of the test images [orig means original resolution]
use_gpu: true,false   -   run models on GPU or CPU

Example:

python test_model.py model=iphone_orig test_subset=full resolution=orig use_gpu=true

6. Test the obtained models

python test_model.py model=<model>

Obligatory parameters:

model: iphone, blackberry or sony

Optional parameters:

test_subset: full,small   -   all 29 or only 5 test images will be processed
iteration: all or <number>   -   get visual results for all iterations or for the specific iteration,
               <number> must be a multiple of eval_step
resolution: orig,high,medium,small,tiny   -   the resolution of the test images [orig means original resolution]
use_gpu: true,false   -   run models on GPU or CPU

Example:

python test_model.py model=iphone iteration=13000 test_subset=full resolution=orig use_gpu=true

7. Folder structure

dped/   -   the folder with the DPED dataset
models/   -   logs and models that are saved during the training process
models_orig/   -   the provided pre-trained models for iphone, sony and blackberry
results/   -   visual results for small image patches that are saved while training
vgg-pretrained/   -   the folder with the pre-trained VGG-19 network
visual_results/   -   processed [enhanced] test images

load_dataset.py   -   python script that loads training data
models.py   -   architecture of the image enhancement [resnet] and adversarial networks
ssim.py   -   implementation of the ssim score
train_model.py   -   implementation of the training procedure
test_model.py   -   applying the pre-trained models to test images
utils.py   -   auxiliary functions
vgg.py   -   loading the pre-trained vgg-19 network

8. Problems and errors

What if I get an error: "OOM when allocating tensor with shape [...]"?

   Your GPU does not have enough memory. If this happens during the training process:

• Decrease the size of the training batch [batch_size]. Note however that smaller values can lead to unstable training.

   If this happens while testing the models:

• Run the model on CPU (set the parameter use_gpu to false). Note that this can take up to 5 minutes per image.
  
• Use cropped images, set the parameter resolution to:

high   -   center crop of size 1680x1260 pixels
medium   -   center crop of size 1366x1024 pixels
small   -   center crop of size 1024x768 pixels
tiny   -   center crop of size 800x600 pixels

   The less resolution is - the smaller part of the image will be processed

9. Citation

@inproceedings{ignatov2017dslr,
  title={DSLR-Quality Photos on Mobile Devices with Deep Convolutional Networks},
  author={Ignatov, Andrey and Kobyshev, Nikolay and Timofte, Radu and Vanhoey, Kenneth and Van Gool, Luc},
  booktitle={Proceedings of the IEEE international conference on computer vision},
  year={2017}
}

10. Any further questions?

Please contact Andrey Ignatov (andrey.ignatoff@gmail.com) for more information