Single Image Dehazing via Multi-Scale Convolutional Neural Networks

项目主页:https://sites.google.com/site/renwenqi888/research/dehazing/mscnndehazing

论文下载:https://drive.google.com/open?id=0B7PPbXPJRQp3TUJ0VjFaU1pIa28

代码下载:https://drive.google.com/open?id=0B7PPbXPJRQp3TUJ0VjFaU1pIa28

摘要

现存方法缺点:The performance of existing image dehazing methods is limited by hand-designed features, such as the dark channel, color disparity and maximum contrast, with complex fusion schemes.

提出的方法:In this paper, we propose a multi-scale deep neural network for single-image dehazing by learning the mapping between hazy images and their corresponding transmission maps. The proposed algorithm consists of a coarse-scale net which predicts a holistic transmission map based on the entire image, and a fine-scale net which refines results locally. To train the multi-scale deep network, we synthesize a dataset comprised of hazy images and corresponding transmission maps based on the NYU Depth dataset. Extensive experiments demonstrate that the proposed algorithm performs favorably against the state-of-the-art methods on both synthetic and real-world images in terms of quality and speed.

暗通道模型+深度学习

动机:现有图像去雾方法的性能受到手工设计的特征的限制(先验),例如暗通道,颜色差异和最大对比度,以及复杂的融合方案

对比方法: Tan(2007)、Fattal(2008)、DCP、 BCCR(Meng)、Tarel、Tang

方法:通过学习模糊图像与其相应的传输图之间的映射,提出了一种用于单图像去雾的多尺度深度神经网络。 所提出的算法包括粗尺度网络,其基于整个图像预测整体透射图,以及精细尺度网络进行局部性的优化。

MSCNN

  • 提出一个多尺度的CNN来学习有效的特征(t);
  • 首先由粗尺度网络估计场景传输图,然后由精细尺度网络细化;
  • 分析传统方法提取的特征与CNN学习的特征之间的差异;

优点

  • 时间很快

缺点

  • 对夜晚雾情况处理不好 

Single Image Dehazing via Multi-Scale Convolutional Neural Networks

 t(x):通过最小化预估的t(x)与真实图像的t(x)之间的MSE;具体步骤见Fig2(b)

Single Image Dehazing via Multi-Scale Convolutional Neural Networks

 A:通过在透射图t(x)中选择0.1%最暗像,在这些像素中,选择相应的雾图像I中具有最高强度的像素作为大气光。

Single Image Dehazing via Multi-Scale Convolutional Neural Networks

提到了他们的速度很快:

Single Image Dehazing via Multi-Scale Convolutional Neural Networks

 

海报

Single Image Dehazing via Multi-Scale Convolutional Neural Networks

 

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