We propose a deep fully convolutional neural network with a new type of layer, named median layer, to restore images contaminated by the salt-and-pepper (s&p) noise. A median layer simply performs median filtering on all feature channels. By adding this kind of layer into some widely used fully convolutional deep neural networks, we develop an end-to-end network that removes the extremely high-level s&p noise without performing any non-trivial preprocessing tasks, which is different from all the existing literature in s&p noise removal. Experiments show that inserting median layers into a simple fully-convolutional network with the L2 loss significantly boosts the signal-to-noise ratio. Quantitative comparisons testify that our network outperforms the state-of-the-art methods with a limited amount of training data. The source code has been released for public evaluation and use (https://github.com/llmpass/medianDenoise).
@article{arxiv.1908.06452,
title = {Convolutional Neural Network with Median Layers for Denoising Salt-and-Pepper Contaminations},
author = {Luming Liang and Sen Deng and Lionel Gueguen and Mingqiang Wei and Xinming Wu and Jing Qin},
journal= {arXiv preprint arXiv:1908.06452},
year = {2019}
}