Latent Diffusion Enhanced Rectangle Transformer for Hyperspectral Image Restoration.

Miaoyu Li, Ying Fu, Tao Zhang, Ji Liu, Dejing Dou, Chenggang Yan, Yulun Zhang
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Abstract

The restoration of hyperspectral image (HSI) plays a pivotal role in subsequent hyperspectral image applications. Despite the remarkable capabilities of deep learning, current HSI restoration methods face challenges in effectively exploring the spatial non-local self-similarity and spectral low-rank property inherently embedded with HSIs. This paper addresses these challenges by introducing a latent diffusion enhanced rectangle Transformer for HSI restoration, tackling the non-local spatial similarity and HSI-specific latent diffusion low-rank property. In order to effectively capture non-local spatial similarity, we propose the multi-shape spatial rectangle self-attention module in both horizontal and vertical directions, enabling the model to utilize informative spatial regions for HSI restoration. Meanwhile, we propose a spectral latent diffusion enhancement module that generates the image-specific latent dictionary based on the content of HSI for low-rank vector extraction and representation. This module utilizes a diffusion model to generatively obtain representations of global low-rank vectors, thereby aligning more closely with the desired HSI. A series of comprehensive experiments were carried out on four common hyperspectral image restoration tasks, including HSI denoising, HSI super-resolution, HSI reconstruction, and HSI inpainting. The results of these experiments highlight the effectiveness of our proposed method, as demonstrated by improvements in both objective metrics and subjective visual quality.

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用于高光谱图像复原的潜在扩散增强矩形变换器
高光谱图像(HSI)的修复在后续的高光谱图像应用中起着举足轻重的作用。尽管深度学习具有卓越的能力,但目前的高光谱图像复原方法在有效探索高光谱图像固有的空间非局部自相似性和光谱低秩属性方面仍面临挑战。本文针对这些挑战,引入了用于 HSI 修复的潜扩散增强矩形变换器,以解决非局部空间相似性和 HSI 特有的潜扩散低秩属性问题。为了有效捕捉非局部空间相似性,我们提出了水平和垂直方向的多形状空间矩形自关注模块,使模型能够利用信息空间区域进行人脸识别还原。同时,我们还提出了光谱潜在扩散增强模块,该模块可根据 HSI 的内容生成特定图像的潜在字典,用于低秩向量提取和表示。该模块利用扩散模型生成全局低秩向量的表示,从而与所需的 HSI 更为接近。对四种常见的高光谱图像修复任务进行了一系列综合实验,包括 HSI 去噪、HSI 超分辨率、HSI 重建和 HSI 内绘。这些实验的结果凸显了我们所提出方法的有效性,客观指标和主观视觉质量的改善都证明了这一点。
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