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JBE, vol. 26, no. 4, pp.429-440, July, 2021
Single Image Super Resolution Based on Residual Dense Channel Attention Block-RecursiveSRNet
Hee-Jo Woo, Ji-Woo Sim, and Eung-Tae Kim
C.A E-mail: Deep Learning, Super Resolution, Recursion, Residual Dense Block, Channel Attention
With the recent development of deep convolutional neural network learning, deep learning techniques applied to single image super-resolution are showing good results. One of the existing deep learning-based super-resolution techniques is RDN(Residual Dense Network), in which the initial feature information is transmitted to the last layer using residual dense blocks, and subsequent layers are restored using input information of previous layers. However, if all hierarchical features are connected and learned and a large number of residual dense blocks are stacked, despite good performance, a large number of parameters and huge computational load are needed, so it takes a lot of time to learn a network and a slow processing speed, and it is not applicable to a mobile system. In this paper, we use the residual dense structure, which is a continuous memory structure that reuses previous information, and the residual dense channel attention block using the channel attention method that determines the importance according to the feature map of the image. We propose a method that can increase the depth to obtain a large receptive field and maintain a concise model at the same time. As a result of the experiment, the proposed network obtained PSNR as low as 0.205dB on average at 4× magnification compared to RDN, but about 1.8 times faster processing speed, about 10 times less number of parameters and about 1.74 times less computation.
Keyword: Deep Learning, Super Resolution, Recursion, Residual Dense Block, Channel Attention
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