Efficient frequency feature aggregation transformer for image super-resolution

Although vision transformers have shown remarkable performance in image super-resolution tasks, the key component, i.e., the self-attention mechanism, suffers from insufficient high-frequency information extraction capability and high computational costs, hindering further advancement. To address these limitations, we propose an efficient frequency feature aggregation transformer for single image super-resolution (EFATSR). Specifically, a frequency self-attention aggregation block is proposed to enhance the extraction of high-frequency information. This block incorporates a frequency spatial feature aggregation branch to supplement high-frequency feature extraction for a self-attention branch, enabling the model to capture high-frequency information more effectively. Additionally, a frequency channel-spatial aggregation block is proposed to extract channel and spatial features in the frequency domain, enhancing the efficiency of deep feature extraction. Extensive experiments on single image super-resolution demonstrate that EFATSR achieves state-of-the-art performance while maintaining low computational complexity. Furthermore, we extend EFATSR for stereo image super-resolution by incorporating a multi-head parallax-attention block, forming EFATSSR, which also shows remarkable performance and high efficiency. Source code is avaliable at https://github.com/jianwensong/EFATSR .