2D-Discontinuity Detection form Scattered Data

摘要

We describe a numerical approach for the detection of discontinuities of a two dimensional function distorted by noise. This problem arises in many applications as computer vision, geology, signal processing. The method we propose is base don the two-dimensional continuous wavelet transform and follows partially the ideas developed in [2], [6] and [8]. It is well-known that the wavelet transform modulus maxima locate the discontinuity points and the sharp variation potions as well. Here we propose a statistical test which, for a suitable scale value, allows us to decide if a wavelet Transform modulus maximum corresponds to a function value discontinuity. Then we provide an Algorithm to detect the discontinuity curves from scattered and noisy data.