Coarse-to-Fine Video Denoising with Dual-Stage Spatial-Channel Transformer

Video denoising aims to recover high-quality frames from the noisy video. While most existing approaches adopt convolutional neural networks(CNNs) to separate the noise from the original visual content, however, CNNs focus on local information and ignore the interactions between long-range regions. Furthermore, most related works directly take the output after spatio-temporal denoising as the final result, neglecting the fine-grained denoising process. In this paper, we propose a Dual-stage Spatial-Channel Transformer (DSCT) for coarse-to-fine video denoising, which inherits the advantages of both Transformer and CNNs. Specifically, DSCT is proposed based on a progressive dual-stage architecture, namely a coarse-level and a fine-level to extract dynamic feature and static feature, respectively. At both stages, a Spatial-Channel Encoding Module(SCEM) is designed to model the long-range contextual dependencies at spatial and channel levels. Meanwhile, we design a Multi-scale Residual Structure to preserve multiple aspects of information at different stages, which contains a Temporal Features Aggregation Module(TFAM) to summarize the dynamic representation. Extensive experiments on four publicly available datasets demonstrate our proposed DSCT achieves significant improvements compared to the state-of-the-art methods.