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Papaya ringspot virus (PRSV) is the most important virus affecting papaya and cucurbit plants in tropical and subtropical areas. PRSV isolates are divided into biotypes P and W: both the P and W types naturally infect plants in the family Cucurbitaceae, whereas the P type naturally infects papaya (Carica papaya). Understanding the origin and nature of the PRSV genetic diversity and evolution is critical...
The paper introduces an adapted orthonormal system to approximate a collection of given images. The associated construction is performed by a pursuit algorithm constrained to build a tree; the pursuit maximization is performed over a large dictionary of Haar wavelet-like functions. The approximations are given by vector valued discrete martingales that converge to the vector of input images. A natural...
The paper describes an algorithm to count and classify cells of different geometrical shapes on a given image. The algorithm assumes that it is known a priori the type of geometries to be recognized and it allows for many different geometrical shapes to appear in the same image with different sizes, locations and orientations. The algorithm combines classical tools, mainly the two dimensional Fourier...
We propose a probabilistic extension of the matching pursuit adaptive signal processing algorithm introduced by Mallat and others. In adaptive signal processing, signals are expanded in terms of a large linearly dependent ''dictionary'' of functions rather than in terms of an orthonormal basis. Matching pursuit is a simple greedy algorithm for generating an expansion of a given signal. In probabilistic...
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