Large-field Astronomical Image Restoration and Superresolution Reconstruction using Deep Learning

• Published in: Publications of the Astronomical Society of the Pacific 2023-11, Vol.135 (1053), p.114505
• Main Authors: Long, Ma, Jiangbin, Du, Jiayao, Zhao, Xuhao, Wang, Yangfan, Peng
• Format: Article
• Language: English
• Subjects: Algorithms; Neural networks; Optical observatories; Signal-to-noise ratio
• ISSN: 0004-6280; 1538-3873
• DOI: 10.1088/1538-3873/ad0a04

The existing astronomical image restoration and superresolution reconstruction methods have problems such as low efficiency and poor results when dealing with images possessing large fields of view. Furthermore, these methods typically only handle fixed-size images and require step-by-step processing, which is inconvenient. In this paper, a neural network called Res&RecNet is proposed for the restoration and superresolution reconstruction of astronomical images with large fields of view for direct imaging instruments. This network performs feature extraction, feature correction, and progressive generation to achieve image restoration and superresolution reconstruction. The network is constructed using fully convolutional layers, allowing it to handle images of any size. The network can be trained using small samples and can perform image restoration and superresolution reconstruction in an end-to-end manner, resulting in high efficiency. Experimental results show that the network is highly effective in terms of processing astronomical images with complex scenes, generating image restoration results that improve the peak signal-to-noise ratio (PSNR) and structural similarity index measure (SSIM) by 4.69 (dB)/0.073 and superresolution reconstruction results that improve the PSNR and SSIM by 1.97 (dB)/0.077 over those of the best existing algorithms, respectively.