Channel-Spatial Attention Network for Lunar Image Super-Resolution
Yabo Duan, Huaizhan Li, Kefei Zhang, Shubi Zhang, Suqin Wu · 2022
High-resolution images of the lunar surface are generally used to study the lunar soil and terrain. Nonetheless, acquiring higher-resolution images involves greater memory and calculation power, which is a challenge for lunar landers or rovers. In this study, a deep convolution neural network single image super-resolution reconstruction method based on channel-space attention is proposed to achieve the mapping of low-resolution lunar surface images to high-resolution lunar surface images. An enhanced block named feature fusion block is used for feature extraction. Furthermore, a channel-spatial attention module including efficient channel attention module and enhanced spatial attention module can extract more discriminative channel features and critical spatial features. Last, the model utilizes local implicit image function to predict RGB values of the images. The images of lander terrain camera and rover panoramic camera carried by Chang'e 3 and Chang'e 4 are used to training and validating models, and the Apollo rover images are used to test. The experiment demonstrates the superiority of the proposed novel model over the comparative method by using images of the Apollo project as the test dataset. Compared with the traditional methods, the PSNR value of the proposed method is improved by about 0.26dB in the 4x super-resolution reconstruction experiment.