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We use a method to estimate local orientations in the n-dimensional space fromthe covariance matrix of the gradient, which can be implemented either in the image space or in the Fourier space. In a second step, two methods allow us to detect sudden changes of orientation in images. The first one use ...

The percolation threshold pc of Boolean models of cylinders with their axis parallel to a given direction is studied by means of simulations. An efficientmethod of construction of percolating connected components was developed, and is applied to one or two scales Boolean model, in order to simulate ...

Transition aluminas, and especially the gamma type, are largely used as catalyst supports in refining and petrochemicals. Most studies focus on properties resulting from material texture and casting (specific surface, porous volume, pore shape and diameter). However, surface properties of alumina sh ...