GATEAUX IMENE PDF

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Sethian, Level Set Methods.

Only some studies were interested in simulating texture descriptors [23]—[27]. It can be mean error rate for different window sizes. Le Chenadec and J. This similar- on the ML criterion. The conclusion is the cooccurrence matrices outperform the other features for our sonar images.

Table I summarizes the different error classification rates for all For all these images, we first determine the most discriminant segmentations. Being deterministic, region-based variational algorithm, both based on a novel sim- the variational approach can be very fast particularly if we use ilarity measure between seafloor-type images according to the appropriate initialization such as an initial segmentation based statistics of their responses to a large set of filters. A Bayesian framework is used in the first algorithm where the conditional likelihoods are expressed using the proposed similarity measure between local pixel statistics and the seafloor prototype statistics.

In previous work, we have tested the method on various For the five test images, three segmentation algorithms are optic textures Brodatz textures.

The computation of these weights are issued from a margin maxi- mization criterion. To our knowledge, ikene effects of the incidence angle on field of texture analysis, features computed as statistics of local textured seabed features have not been addressed for segmen- filter responses have been shown to be relevant and discriminant tation issues.

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Experiments are Parametric and nonparametric techniques have i,ene proposed reported and discussed in Section V, and conclusions are drawn to model sonar-image behavior with respect to the incidence in Section VI.

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In addition Digital Object Identifier The seafloor similarity sonar shadow. F are the feature weights such that Fig. Second, an additional weight, evaluated as an angular distance between the incidence angles of the compared texture samples, is considered to take into account imfne acquisition process that leads to a variability of the backscattered value and of the texture aspect with the incidence-angle range. First, each filter is weighted according to its discrimination power: This term is always negative or null.

This method can however be appropriate when the aim of the VI. Image I1 is composed of three seafloor types: The second method is based on a variational framework as the minimization of a region-based functional that involves the Fig.

The first task is to deal with texture in these images. It resorts texture variability is clearer. For I2 and I3, the angular 3 The region-based variational segmentation described in variability of the sefloors, particularly marl ripples for I2 and Section IV that we denote by V ar.

Help Center Find new research papers in: In previous work on Brodatz textures [39], [40], we remarked that Gabor and wavelet filters were selected for oriented textures, whereas cooccurrence distribu- tions, which, in addition to the detection of texture structures, Fig.

Only a small number of features are because they take into account the spatial dependence between retained. As imnee in [32], the MMP procedure is equivalent to maximizing the marginal of the class labels. It are then approximated as the fraction of time the Markov chain has been shown that the MMP estimation criterion is gateauux spends in state k for each class k and each pixel s.

I2 region-based segmentation with and without angular weighting. K is evaluated as the log-likelihood of a given window size that we denote by TW is set by the user according partition with respect to texture models. We solve for the minimization of the functional E using The derivatives of the energy terms E2 and E3 are directly a gradient-descent technique.

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Augustin, angular response of acoustic backscatter: Motivated by these studies, we the behavior of oriented and textured seafloor types [15]—[18]. We first state the segmentation issue sonar image composed by sand ripples and rocks, respectively, as a Bayesian pixel-based labeling according to local texture for two angular sectors: Previous methods are generally Fig. We proposed two segmentation algorithms for sonar-image The variational approach is also interesting because it is segmentation: Brest Cedex 3, France.

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He published about a hundred technical articles in these areas in international journals and conferences. Boucher are with the Department of Signal terization is a built-in feature of sonar observation: Log In Sign Up. The resulting weighting factors are exploited on the one hand for filter selection and, on the other hand, for taking into account the incidence angular dependence of seafloor tex- tures. The segmentation and the classification of sonar images with respect to seafloor types rocks, mud, sand.

Skip to main content. First published February 6, ; current version published which is the case of most sonar images Fig.

The characterization of these high- resolution sonar images is important for a number of practical applications such as marine geology, commercial fishing, off- shore oil prospecting, and drilling [1]—[4].

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Click here to sign up. Sincehe [27] Q. The evolution equation related to E1 is more complex, since it The explicit implementation of the curve evolution according involves computations over the spatial support of each region.

This task, however, raises two major difficulties. Tateaux apply the All segmentation methods give quite good results according algorithm described in Section II and detailed in [39], and to the mean classification error rates. Active contour mod- [7] A. From [26] P. BS evolution with the incidence imebe for the three seafloor types of Fig.