关键词: 视觉效果, 超分辨率重建, 并联结构, 残差网络, 感知损失

Abstract:

The existing image super-resolution reconstruction algorithms can improve the overall visual effect of the image or promote the objective evaluation value of the reconstructed image， but have poor balanced improvement effect of image perception effect and objective evaluation value， and the reconstructed images lack high-frequency information， resulting in texture blur. Aiming at the above problems， an image super-resolution reconstruction algorithm based on parallel convolution and residual network was proposed. Firstly， taking the parallel structure as the overall framework， different convolution combinations were used on the parallel structure to enrich the feature information， and the jump connection was added to further enrich the feature information and fuse the output to extract more high-frequency information. Then， an adaptive residual network was introduced to supplement information and optimize network performance. Finally， perceptual loss was used to improve the overall quality of the restored image. Experimental results show that， compared with the algorithms such as Super-Resolution Convolutional Neural Network （SRCNN）， Very Deep convolutional network for Super-Resolution （VDSR） and Super-Resolution Generative Adversarial Network （SRGAN）， the proposed algorithm has better performance in image reconstruction and has clearer detail texture of the enlarged effect image. In the objective evaluation， the Peak Signal-To-Noise Ratio （PSNR） and Structural SIMilarity （SSIM） of the proposed algorithm in \times \mathrm{4} reconstruction are improved by 0.25 dB and 0.019 averagely and respectively compared with those of SRGAN.

Key words: visual effect, super-resolution reconstruction, parallel structure, residual network, perceptual loss