基于张量核范数框架表示和总变分的高光谱图像去噪

Hyperspectral Image Denoising Based on Tensor Nuclear Norm Framelet Representation and Total Variation

  • 摘要: 高光谱数据在采集的过程中,不可避免地受到噪声的污染,影响图像后续的应用精度,为此提出了一种基于张量核范数框架表示和总变分的高光谱图像去噪模型。该模型首先利用框架张量核范数对于高度相关三阶张量时,每个管都是稀疏的且框架变换的矩阵正面切片对应的矩阵秩和都很小,可以充分表示高光谱图像的低秩特性;其次,对其采用一个l2, 1范数表示的加权空间光谱总变分,增强稀疏性的同时保持空间光谱的局部平滑;最后将二者进行有效地结合,充分探索了高光谱图像的低秩特性和空间光谱的稀疏平滑性,达到去除高斯噪声和条带噪声的目的。在模拟和真实数据实验中,与其他经典的去噪算法相比,该模型的去噪性能更佳,去噪后的图像更清晰,保留的细节更多且轮廓曲线也不会过于平滑。

     

    Abstract: During hyperspectral data acquisition, noise contamination inevitably degrades image quality and affects the accuracy of subsequent applications. To address this issue, this study proposes a hyperspectral image denoising model based on a tensor kernel norm framework combined with total variation regularization. First, the proposed model employs a tensor kernel norm framework tailored for highly correlated third-order tensors. In this framework, each tensor tube exhibits sparsity, and the sum of matrix ranks corresponding to the frontal slices of the transformed tensor is minimized, thereby fully capturing the low-rank characteristics of hyperspectral images. Second, a weighted spatial–spectral total variation term, expressed using the l2, 1 norm, is incorporated to enhance sparsity while preserving local smoothness in the spatial– spectral domain. Finally, these two components are effectively integrated to jointly exploit the low-rank properties of hyperspectral images and the sparse smoothness of the spatial–spectral domain, thereby achieving removal of high-intensity Gaussian noise and strip noise. Both simulation and real-data experiments demonstrate that, compared with five classical denoising algorithms, the proposed model achieves superior denoising performance. The restored images exhibit improved clarity, better detail preservation, and well-maintained structural contours without excessive smoothing.

     

/

返回文章
返回