Equivariant Imaging for Self-supervised Hyperspectral Image Inpainting: A Novel Algorithm Outperforming Existing Methods

Konsep Inti

A novel self-supervised algorithm called Hyper-EI that solves challenging hyperspectral image inpainting tasks without requiring any external training data, and outperforms existing self-supervised methods.

Abstrak

The paper introduces a novel self-supervised algorithm called Hyper-EI for hyperspectral image (HSI) inpainting. The key contributions are:

Proposing Hyper-EI, a self-supervised algorithm that can solve HSI inpainting tasks without requiring any external training data, by leveraging the concept of equivariant imaging (EI).

Introducing a novel spatio-spectral attention architecture to exploit both spatial and spectral correlations in HSI data, improving the inpainting performance.

Extensive experiments on real-world HSI datasets demonstrate that Hyper-EI outperforms existing self-supervised methods in terms of inpainting quality, generalizability, and robustness. This challenges the common belief that high-quality HSI inpainting requires pre-trained models.

The HSI inpainting task is formulated as reconstructing a clean HSI image x from an incomplete or corrupted measurement y. Hyper-EI leverages the EI concept, which assumes the existence of a set of group transformations that can span the null-space of the measurement operator. This allows Hyper-EI to learn the inverse mapping from the corrupted input y without any external training data.
The training of Hyper-EI involves two loss terms: the measurement consistency (MC) loss and the EI regularization loss. The MC loss ensures the reconstructed image is consistent with the observed measurements, while the EI loss enforces the equivariance property. Additionally, a novel spatio-spectral attention architecture is introduced to capture both spatial and spectral correlations in HSI data.
Experiments on three real-world HSI datasets demonstrate that Hyper-EI outperforms existing self-supervised methods like DHP, PnP-DIP, and R-DLRHyIn in terms of both MPSNR and MSSIM metrics. The inpainted regions by Hyper-EI show better consistency with the background and preserve more textures compared to other methods.

Statistik

The proposed Hyper-EI algorithm outperforms existing self-supervised methods by a significant margin on real-world HSI datasets. For example, on the Chikusei dataset, Hyper-EI achieves an MPSNR of 41.584 and an MSSIM of 0.931, compared to 38.551 and 0.897 for the DHP baseline, 39.102 and 0.905 for PnP-DIP, and 39.437 and 0.917 for R-DLRHyIn.

Kutipan

"Hyper-EI is a promising solution for HSI inpainting tasks, which not only generate realistic image pixels in the missing areas, but the images have also smoother contents at the edges."
"Extensive experiments on real HS data demonstrate the superiority of the proposed Hyper-EI algorithm over existing self-supervised methods."

Wawasan Utama Disaring Dari

Equivariant Imaging for Self-supervised Hyperspectral Image Inpainting

by Shuo Li,Mike... pada arxiv.org 04-23-2024

https://arxiv.org/pdf/2404.13159.pdf

Pertanyaan yang Lebih Dalam

How can the Hyper-EI algorithm be extended to other HSI inverse problems beyond inpainting, such as denoising, compressive sampling, and super-resolution?

The Hyper-EI algorithm's framework can be extended to address various other HSI inverse problems by leveraging its self-supervised learning approach and equivariant imaging principles. For denoising tasks, the algorithm can be adapted to learn the underlying noise patterns in hyperspectral images and effectively remove noise while preserving important spectral information. By incorporating noise modeling and regularization techniques, Hyper-EI can enhance denoising performance.
In the case of compressive sampling, Hyper-EI can be utilized to reconstruct full hyperspectral images from sparse measurements efficiently. By exploiting the inherent structure and redundancies in hyperspectral data, the algorithm can learn to reconstruct missing spectral bands accurately, enabling high-quality recovery from compressed measurements.
For super-resolution tasks, Hyper-EI can be extended to enhance the spatial resolution of hyperspectral images. By incorporating spatial attention mechanisms and learning spatial correlations, the algorithm can generate high-resolution hyperspectral images from lower-resolution inputs. This extension would involve adapting the network architecture to focus on spatial details while maintaining spectral fidelity.

What are the potential limitations of the equivariant imaging approach, and how can they be addressed to further improve the performance of Hyper-EI?

One potential limitation of the equivariant imaging approach is the computational complexity associated with handling multiple group operators and enforcing invariance constraints. To address this, optimization strategies such as efficient parameter initialization, regularization techniques, and model pruning can be employed to streamline the training process and improve computational efficiency.
Another limitation could be the sensitivity of equivariant imaging to variations in input data distributions or transformations. To enhance robustness, data augmentation techniques can be utilized to expose the model to diverse input variations during training, enabling it to generalize better to unseen data and transformations.
Additionally, the equivariant imaging approach may face challenges in capturing complex spatial and spectral dependencies in hyperspectral data. To overcome this limitation, more sophisticated network architectures, such as graph neural networks or attention mechanisms, can be integrated into Hyper-EI to better model long-range dependencies and intricate spectral correlations, thereby improving overall performance.

Given the self-supervised nature of Hyper-EI, how can the algorithm be adapted to handle different types of HSI data, such as those acquired by various sensors or in different environments?

To adapt Hyper-EI to handle diverse types of HSI data acquired by different sensors or in varying environments, transfer learning techniques can be employed. By pre-training the algorithm on a diverse set of hyperspectral datasets from different sensors and environments, Hyper-EI can learn generalized features and patterns that are applicable across various data sources.
Furthermore, domain adaptation methods can be utilized to fine-tune the pre-trained Hyper-EI model on specific datasets or sensor characteristics, enabling it to adapt and perform well on new, unseen data. By incorporating domain-specific knowledge during training, the algorithm can effectively handle variations in sensor characteristics, noise levels, and environmental conditions.
Moreover, data augmentation strategies tailored to specific sensor modalities or environmental conditions can be implemented to enhance the algorithm's robustness and generalization capabilities. By augmenting the training data with sensor-specific transformations or environmental variations, Hyper-EI can learn to inpaint missing data accurately across different HSI datasets and scenarios.