arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1208.2292math.NAcs.NA
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L1样条用于网格数据的鲁棒、简单且快速平滑

L1 Splines for Robust, Simple, and Fast Smoothing of Grid Data

Duke University(杜克大学);University of Minnesota(明尼苏达大学)

Mariano Tepper, Guillermo Sapiro

AI总结:

提出用L1范数替代L2范数作为拟合项,结合分裂Bregman迭代与DCT,实现网格数据平滑的鲁棒、简单且快速算法。

摘要:

样条是平滑含噪数据的一种流行且有吸引力的方法。计算样条涉及最小化一个由拟合项和正则化项线性组合而成的泛函。经典方法使用(加权)L2范数计算拟合项,而正则化项确保平滑性。因此,在处理网格数据时,可以使用DCT非常高效地求解优化问题。在这项工作中,我们建议用L1范数替代拟合项中的L2范数,从而自动实现对异常值的鲁棒性。为了求解由此产生的极小化问题,我们提出了一种极其简单且高效的数值方案,该方案基于分裂Bregman迭代与DCT相结合。实验验证表明,该方法能在短时间内获得高质量结果。

英文摘要:

Splines are a popular and attractive way of smoothing noisy data. Computing splines involves minimizing a functional which is a linear combination of a fitting term and a regularization term. The former is classically computed using a (weighted) L2 norm while the latter ensures smoothness. Thus, when dealing with grid data, the optimization can be solved very efficiently using the DCT. In this work we propose to replace the L2 norm in the fitting term with an L1 norm, leading to automatic robustness to outliers. To solve the resulting minimization problem we propose an extremely simple and efficient numerical scheme based on split-Bregman iteration combined with DCT. Experimental validation shows the high-quality results obtained in short processing times.

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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