Remarkable progresses have been made in hyperspectral image (HSI) denoising. However, the majority of existing methods are predominantly confined to the spatial-spectral domain, overlooking the untapped potential inherent in the Fourier domain. This paper presents a novel approach to address HSI denoising by bridging the information from the Fourier and spatial-spectral domains. Our method highlights key insights into the Fourier properties within spatial and spectral domains through the Fourier transform. Specifically, we note that the amplitude inherently embody noise and photon reflection characteristics, while the phase holds structural information. These insights unveil new perspectives on the physical properties of HSIs, motivating us to leverage complementary information exchange between Fourier and spatial-spectral domains. To this end, we introduce the Fourier-prior Integration Denoising Network (FIDNet), a potent yet straightforward approach that utilizes Fourier insights to synergistically interact with spatial-spectral domains for superior HSI denoising. In FIDNet, we independently extract spatial and Fourier features through dual branches and merge these representations to enhance spectral evolution modeling through the inherent structure consistency constraints and continuing reflection variation revealed in Fourier prior. Our proposed method demonstrates robust generalization across synthetic and real-world benchmark datasets, achieves comparable results with state-of-the-art methods in both quantitative quality and visual results. The code is available at https://github.com/MIV-XJTU/FIDNet.

Recently, more and more large pre-trained models have emerged. Several parameter-efficient tuning methods have been studied to transfer the prior knowledge of the pre-trained models to specific downstream tasks and achieve promising results. This paper proposes a simple yet effective method called Atten-Adapter. To the best of our knowledge, this is the first work that utilizes attention with learnable parameters as the internal structure of the adapter in the field of fine-tuning. The attention-based adapter can provide better information fusion ability and pay more attention to the global features compared to the MLP-based adapter. As a plug-and-play module, Atten-Adapter can be easily adapted to different types of vision models such as ConvNets and Transformer architectures in different tasks like classification and segmentation. Moreover, we demonstrate the generality of our proposed adapters by conducting experiments on language models. With small amounts of tunable parameters, our method achieves significant improvements compared to the previous state-of-the-art methods.

Hyperspectral image (HSI) denoising has achieved promising results with the development of deep learning. A mainstream class of methods exploits the spatial-spectral correlations and recovers each band with the aids of neighboring bands, collectively referred to as spectral auxiliary networks. However, these methods treat entire adjacent spectral bands equally. In theory, clearer and nearer bands tend to contain more reliable spectral information than noisier and farther ones with higher uncertainties. How to achieve spectral enhancement and adaptation of each adjacent band has become an urgent problem in HSI denoising. This work presents the UA-Adjustor, a comprehensive adjustor that enhances denoising performance by considering both the band-to-pixel and enhancement-to-adjustment aspects. Specifically, UA-Adjustor consists of three stages that evaluate the importance of neighboring bands, enhance neighboring bands based on uncertainty perception, and adjust the weight of spatial pixels in adjacent bands through estimated uncertainty. For its simplicity, UA-Adjustor can be flexibly plugged into existing spectral auxiliary networks to improve denoising behavior at low cost. Extensive experimental results validate that the proposed solution can improve over recent state-of-the-art (SOTA) methods on both simulated and real-world benchmarks by a large margin.

Spectral modeling plays a critical role in denoising hyperspectral images (HSIs), with recent approaches leveraging well-designed network architectures to extract spectral contexts for noise removal. However, these approaches overlook a striking finding: the presence of spectral differences in noisy contexts can pose challenges for the denoising network during the restoration process of each band in the HSI. We attribute this to the varying levels of spectral difference between different bands and the unknown distribution of various noises. These factors can make it difficult for the network to capture consistent features, ultimately leading to suboptimal solutions. We propose a novel concept termed 'spectral displacement,' which views spectral differences as pixel motion displacement along the spectral domain. To eliminate the effect of spectral displacement, we introduce a potential solution: spectral alignment. This approach can increase the mutual information between different spectral bands and enhance the effectiveness of denoising. We then present the Spectral Alignment Recurrent Network (SARN) for efficient and effective displacement estimation and pixel-level alignment between neighboring bands. SARN can serve as a general plug-in for HSI backbones without requiring any model-specific design. Experimental results on several benchmark datasets confirm the effectiveness and superiority of our concept and network. The source code will be available at https://github.com/MIV-XJTU/SARN.