Multistage Progressive Interactive Fusion Network for Sentinel-2: High Resolution for All Bands
Xin Liu, Xiangchao Meng, Qiang Liu, Xu Chen, Rui Zhao, Feng Shao · IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing · 2023
Sentinel-2 satellite remote sensing images have been widely used in various fields, such as change detection and resource monitoring. However, Sentinel-2 provides multispectral bands with inconsistent spatial resolutions (i.e., 60 m for three bands, 20 m for six bands, and 10 m for four bands), which has greatly limited the application values, especially for cooperative analysis or application on different bands at a unified resolution. In this paper, we proposed a Multistage Progressive Interactive Fusion Network (MPIFNet) to generate all 10 m high-resolution bands. Specifically, a refined multi-stage spatial resolution enhancement model in a multistage way is developed to progressively improve the low-resolution bands, to preserve the spectral information of the enhanced bands. Moreover, an information interaction module is proposed for the three branches of high (10 m), medium (20 m) and low-resolution (60 m) bands to achieve effective information interaction. The experimental results show that our method is superior to other existing state-of-the-art methods, and it can be applied to the reconstruction of the high-resolution vegetation index.