  Closed-loop negative feedback mechanism is extensively utilized in automatic
control systems and brings about extraordinary dynamic and static performance.
In order to further improve the reconstruction capability of current methods of
compressed image super-resolution, a circular Swin2SR (CSwin2SR) approach is
proposed. The CSwin2SR contains a serial Swin2SR for initial super-resolution
reestablishment and circular Swin2SR for enhanced super-resolution
reestablishment. Simulated experimental results show that the proposed CSwin2SR
dramatically outperforms the classical Swin2SR in the capacity of
super-resolution recovery. On DIV2K test and valid datasets, the average
increment of PSNR is greater than 0.18 dB and the related average increment of
SSIM is greater than 0.01.
