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arXiv 2003.10324math.NAcs.NA
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流形上基于切空间的快速交替投影

Fast Alternating Projections on Manifolds Based on Tangent Spaces

Guangjing Song, Michael K. Ng

摘要:

本文基于切空间研究非切流形上的交替投影。其主要动机是将点投影到流形上可能是计算昂贵的。为了减少计算量,我们提出利用流形上点的切空间来近似投影到流形上。我们证明了在两个非切流形上交替投影所产生的序列线性收敛到两个流形相交处的一个点,该点的收敛点接近于最优解。通过对非负低秩矩阵近似和低秩图像四元数矩阵(彩色图像)近似的数值算例,证明了该方法在计算时间上优于经典的交替投影法.

英文摘要:

In this paper, we study alternating projections on nontangential manifolds based on the tangent spaces. The main motivation is that the projection of a point onto a manifold can be computational expensive. We propose to use the tangent space of the point in the manifold to approximate the projection onto the manifold in order to reduce the computational cost. We show that the sequence generated by alternating projections on two nontangential manifolds based on tangent spaces, converges linearly to a point in the intersection of the two manifolds where the convergent point is close to the optimal solution. Numerical examples for nonnegative low rank matrix approximation and low rank image quaternion matrix (color image) approximation, are given to demonstrate that the performance of the proposed method is better than that of the classical alternating projection method in terms of computational time.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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