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基于统一的低秩矩阵优化算法的纹理图像修复

Texture Repairing by Unified Low Rank Optimization

  • 摘要: 本文介绍了一种新的基于凸优化算法的低秩纹理修复算法, 可自动处理同时包含随机或连续损毁的输入图像。除了纹理的低秩性以外, 为了更好的修复输入图像, 文中还引入了一个对自然图像的假设:由于输入图像分段光滑, 故在某些变换基下稀疏(如傅里叶变换或者离散余弦变换)。通过结合纹理的低秩性和稀疏性假设, 文中提出了基于凸优化的图像修复算法, 可以在不知道图像损毁区域的情况下自动检测损毁区域并修复纹理的全局结构。此修复算法将纹理的校正与修复整合为一个优化问题同时进行求解。文中的大量实验和对比结果证实了算法不但优于现有的低秩矩阵优化算法, 而且在修复损毁面积较大, 不规则的或有较大透视变形的图像上有极大的优势。

     

    Abstract: In this paper, we show how to harness both low-rank and sparse structures in regular or near-regular textures for image completion. Our method is based on a unified formulation for both random and contiguous corruption. In addition to the low rank property of texture, the algorithm also uses the sparse assumption of the natural image: because the natural image is piecewise smooth, it is sparse in certain transformed domain (such as Fourier or wavelet transform). We combine low-rank and sparsity properties of the texture image together in the proposed algorithm. Our algorithm based on convex optimization can automatically and correctly repair the global structure of a corrupted texture, even without precise information about the regions to be completed. This algorithm integrates texture rectification and repairing into one optimization problem. Through extensive simulations, we show our method can complete and repair textures corrupted by errors with both random and contiguous supports better than existing low-rank matrix recovery methods. Our method demonstrates significant advantage over local patch based texture synthesis techniques in dealing with large corruption, non-uniform texture, and large perspective deformation.

     

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