Asymptotic convergence rate of the longest run in an inflating Bernoulli net
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In image detection, one problem is to test whether the set, though mostly consisting of uniformly scattered points, also contains a small fraction of points sampled from some (a priori unknown) curve, for example, a curve with C^α-norm bounded by β. One approach is to analyze the data by counting membership in multiscale multianisotropic strips, which involves an algorithm that delves into the length of the path connecting many consecutive "significant" nodes. In this paper, we develop the mathematical formalism of this algorithm and analyze the statistical property of the length of the longest significant run. The rate of convergence is derived. Using percolation theory and random graph theory, we present a novel probabilistic model named pseudo-tree model. Based on the asymptotic results for pseudo-tree model, we further study the length of the longest significant run in an "inflating" Bernoulli net. We find that the probability parameter p of significant node plays an important role: there is a threshold p_c, such that in the cases of p<p_c and p>p_c, very different asymptotic behaviors of the length of the significant are observed. We apply our results to the detection of an underlying curvilinear feature and argue that we achieve the lowest possible detectable strength in theory.
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