This repository is an implementation of [LLNet: A Deep Autoencoder Approach to Natural Low-light Image Enhancement] (https://arxiv.org/pdf/1511.03995.pdf) on Theano. It includes the codes and modules used for running LLNet via a Graphical User Interface. Users can choose to train the network from scratch, or to enhance multiple images using a specific trained model.

NOTE: A trained model using 17x17 patches can be found in models/

Open the terminal and navigate to this directory. Type:

#!bash
python llnet.py

to launch the program with GUI. For command-line only interface, you type the following command in the terminal.

To train a new model, enter:

#!bash
python llnet.py train [TRAINING_DATA]

To enhance an image, enter:

#!bash
python llnet.py test [IMAGE_FILENAME] [MODEL_FILENAME]

For example, you may type:

#!bash
python llnet.py train datafolder/yourdataset.mat
python llnet.py test somefolder/darkpicture.png models/model_009_17x17.obj

where file names do not need to be in quotes.

Datasets need to be saved as .MAT file with the '-v7.3' tag in MATLAB. The saved variables are:

train_set_x     (N x wh)   Noisy, darkened training data
train_set_y     (N x wh)   Clean, bright training data
valid_set_x     (N x wh)   Noisy, darkened validation data
valid_set_y     (N x wh)   Clean, bright validation data
test_set_x      (N x wh)   Noisy, darkened test data
test_set_y      (N x wh)   Clean, bright test data

Where N is the number of examples and w, h are the width and height of the patches, respectively. Test data are mostly used to plot the test patches; in actual applications we are interested to enhance a single image. Use the test command instead.