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In image deblurring, information from the regions where the blur was propagated is needed for effective deblurring. For example, large blurs, such as those caused by fast-moving objects leaving a trail of afterimages, need spatial context from a large region, while small blurs, such as those caused by slight camera shake, need spatial context from a smaller scope. In this paper, we used multi-scale features to provide the spatial dependencies needed to deblur non-uniform blurs. Compared to previous works, we efficiently extract multi-scale features using two approaches: (1) coarse-to-fine scheme that can extract multi-scale features by applying the network to different scales of the images, and (2) dilated convolutions that can extract multi-scale features by using different dilation rates. Combining both methods has a multiplicative effect since multi-scale features from dilated convolutions are extracted from the input images at different scales (i.e. coarse-to-fine scheme). Furthermore, we optimized our network architecture by using parallel convolutions to decrease the execution time of the deblurring process. We show that our proposed method has better results than state-of-the-art methods in terms of image quality and execution time. INDEX TERMS Blind motion deblurring, convolutional neural network, dilated convolution, multi-scale information, coarse-to-fine network.

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