Light field image super-resolution network based on angular difference enhancement

Based on the advanced imaging technology, light field camera can obtain the spatial information and the angular information of the scene synchronously. It achieves higher dimensional scene representation by sacrificing the spatial resolution. In order to improve the spatial resolution of the light field image, a light field super-resolution reconstruction network based on angle difference enhancement is built in this paper. In the proposed network, eight multi-branch residual blocks are used to extract shallow features. Then, four enhanced angular deformable alignment modules are used to extract deep features. Finally six simplified residual feature distillation modules and pixel shuffle modules are used to complete data reconstruction. The proposed network takes advantage of the angle difference of the light field to complete the spatial information super-resolution. In order to obtain more features difference between different views, the own feature of the single view is emphasized during the feature extraction. The performance of the proposed network is verified on five public light field data sets. The proposed algorithm obtains high-resolution light field sub-aperture images with higher PSNR and SSIM.