Ifp Energies Nouvelles

Institute Francais Du Petrole

François Wahl

Florent Picard

Clementina Lopez Garcia

Jean-Marc Bader

Maxime Moreaud

The invention is a method for the segmentation of an object's image obtained by three-dimensional reconstruction. Based on an object's image represented by a finite number of intensity levels, the image is reconstructed based on projections acquired from different angles around the object, a distribution representative of the spread of the intensity levels in the image along a predetermined direction is determined, for at least one angle. Next, at least one intensity threshold is determined by minimizing an objective function estimating the difference between the actual measurement and a simulated measurement for the angle being considered with the simulated measurement being dependent on the threshold and the distribution. Next, the image is segmented by grouping the intensity levels into at least two classes defined by the threshold. The invention has a particular application to characterization of supports of catalysts for petrochemical refining.

Method of segmenting the image of an object reconstructed by three-dimensional reconstruction

This invention describes a method for determining the content of conjugated diolefins by means of the measurement of the MAV of a sample of catalytic cracking gasoline or thermal cracking gasoline, from its NIR (near-infrared) spectrum, and the application of said method for monitoring a unit for selective hydrogenation of the cracking gasolines.

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Chaponost, France

François Wahl