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arXiv 1302.6498stat.AP
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多元广义高斯分布的参数估计

Parameter Estimation For Multivariate Generalized Gaussian Distributions

F. Pascal, L. Bombrun, J. Y. Tourneret, Y. Berthoumieu

摘要:

多元广义高斯分布(MGGD)由于其重尾和全参数形式,在信号和图像处理应用中的极端事件建模方面受到广泛关注。针对MGGD参数的估计问题,证明了对于给定的形状参数β \in(0,1),散布矩阵的极大似然估计(MLE)的存在性和唯一性.此外,提出了一种基于Newton-Raphson递推的估计算法来计算MGGD参数的MLE。合成和真实数据进行的各种实验来说明理论推导的迭代次数和样本数的形状参数的不同值。本文的主要结论是,利用极大似然原理可以估计出MGGDs的参数,并具有良好的性能。

英文摘要:

Due to its heavy-tailed and fully parametric form, the multivariate generalized Gaussian distribution (MGGD) has been receiving much attention for modeling extreme events in signal and image processing applications. Considering the estimation issue of the MGGD parameters, the main contribution of this paper is to prove that the maximum likelihood estimator (MLE) of the scatter matrix exists and is unique up to a scalar factor, for a given shape parameter β\in(0,1). Moreover, an estimation algorithm based on a Newton-Raphson recursion is proposed for computing the MLE of MGGD parameters. Various experiments conducted on synthetic and real data are presented to illustrate the theoretical derivations in terms of number of iterations and number of samples for different values of the shape parameter. The main conclusion of this work is that the parameters of MGGDs can be estimated using the maximum likelihood principle with good performance.

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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