Veronique Rebuffel

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Both in radiographic and tomographic mode, conventional X-ray imaging provides information about the examined object which is not sufficient to characterize it precisely. Dual-energy X-ray technique, which consists in combining two radiographs acquired at two distinct energies, allows to obtain both density and atomic number, thus to provide information(More)
Conventional explosive detection systems (EDS) based on X-ray technologies are using dual-energy radiography; they provide only a crude material characterization. Recently emerged semiconductors based X-ray detectors offer new capabilities in energy discrimination. This study is aiming at evaluating their interest for EDS. LETI-LDET laboratory has developed(More)
A new gamma-camera architecture named HiSens is presented and evaluated. It consists of a parallel hole collimator, a pixelated CdZnTe (CZT) detector associated with specific electronics for 3D localization and dedicated reconstruction algorithms. To gain in efficiency, a high aperture collimator is used. The spatial resolution is preserved thanks to(More)
This paper deals with the detection of moving objects. We have deened a method able to cope with perturbations frequently encountered during acquisition of outdoor image sequences: camera not perfectly stationary, illumination modiications, occlusions, ... Temporal integration and statistical regularization are the two main features of the method. A(More)
X-ray imaging is a suitable technique for nuclear waste drums inspection, especially large and highly attenuating ones. It requires an energy source greater than 6MeV and dose rate over 0.1Gy/s. Controlling waste drums calls for a multi-level strategy: from systematic and fast controls to specific or detailed examinations. Using a high energy (8MeV)(More)
X-ray imaging is a powerful tool for the inspection of industrial castings. The radiograph quality is highly dependant of a large number of inspection parameters: generator settings, object geometrical parameters and detector characteristics. When trying to optimize these parameters, the large dimensionality of the problem makes the manual investigation of(More)
The computer simulation of realistic radiographs has been proved to be an efficient tool for the design of X-ray systems, the specification of their components, the development of dedicated image processing methods and the final validation. Sindbad software has been developed at LDET laboratory for that purpose. The goal of this paper is to describe new(More)