Unified Interpretable Deep Network for Joint Super-Resolution and Pansharpening.

Joint super-resolution and pansharpening (JSP) brings new insight into the spatial improvement of multispectral images. How to efficiently balance the spatial and spectral qualities in JSP is important for deep learning-based approaches. To address this problem, we propose a unified interpretable deep network for JSP, named UIJSP-Net. First, we formulate the JSP problem as an optimization problem in a specially designed physical model based on the relationship among the JSP result, the multispectral image, and the panchromatic image. In particular, two deep priors are utilized to describe latent distributions of different variables, which can improve the accuracy of the physical model. Furthermore, we adopt the alternating direction method of multipliers to solve the above optimization problem, where a series of iterative steps are generated. Finally, we design UIJSP-Net by unfolding these iterative steps into multiple corresponding stages in a unified network. Because UIJSP-Net has clear physical meanings, the spatial resolution of multispectral images can be efficiently improved while the spectral information can be kept as well. Extensive experimental results are carried out on both simulated and real datasets to demonstrate the superiority of UIJSP-Net over other state-of-the-art methods from qualitative and quantitative aspects. [ABSTRACT FROM AUTHOR]