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arXiv 1202.3596math.FA
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多元紧小波框架的实代数观点

A real algebra perspective on multivariate tight wavelet frames

Maria Charina, Mihai Putinar, Claus Scheiderer, Joachim Stoeckler

摘要:

最近的结果从真正的代数几何和多项式优化理论有关的多元紧小波框架的存在性问题,其生成元至少有一个消失时刻在一个新的框架。也就是说,Ron和Shen提出的酉扩张原理的几个等价公式可以用某些非负三角多项式的埃尔米特平方和半定规划来解释。后者与最近的结果在代数几何和半定规划,使我们能够回答肯定的长期存在的开放问题,这种紧小波框架的存在,在尺寸$d=2$,我们还提供了数值有效的方法,检查其存在和实际建设的任何维度。我们展示了一类反例的尺寸$d=3$显示,在一般情况下,UEP属性是不足以存在的紧小波框架。另一方面,我们给出了$d > 3$维上紧小波框架存在的更强的充分条件,并通过几个例子说明了我们的结果。

英文摘要:

Recent results from real algebraic geometry and the theory of polynomial optimization are related in a new framework to the existence question of multivariate tight wavelet frames whose generators have at least one vanishing moment. Namely, several equivalent formulations of the so-called Unitary Extension Principle by Ron and Shen are interpreted in terms of hermitian sums of squares of certain nonnegative trigonometric polynomials and in terms of semi-definite programming. The latter together with the recent results in algebraic geometry and semi-definite programming allow us to answer affirmatively the long standing open question of the existence of such tight wavelet frames in dimension $d=2$; we also provide numerically efficient methods for checking their existence and actual construction in any dimension. We exhibit a class of counterexamples in dimension $d=3$ showing that, in general, the UEP property is not sufficient for the existence of tight wavelet frames. On the other hand we provide stronger sufficient conditions for the existence of tight wavelet frames in dimension $d > 3$ and illustrate our results by several examples.

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