Geometry-Aware RWKV for Heterogeneous Light Field Spatial Super-Resolution

Heterogeneous Light Field (LF) spatial Super-Resolution (SR) aims to significantly enhance the spatial resolution of LF imaging by integrating an extra 2D digital camera. Inspired by the Receptance Weighted Key Value (RWKV), a simple yet effective heterogeneous LF spatial SR method is proposed. Specifically, a texture transfer module with channel correlation is designed, which leverages a feature distillation strategy to transfer texture information from the high-resolution 2D image to the low-resolution LF image. Meanwhile, a spatial-angular rectification module is constructed to restore the spatial-angular coherence damaged in texture transfer. It employs geometry-aware RWKV to capture the intrinsic geometric structure of LFs. Experimental results show that the proposed method outperforms the state-of-the-art methods in both quantitative and qualitative comparisons, while achieving higher efficiency in terms of inference time and memory usage.