These results indicate that VLPS surgery induces an activation of the clotting system that, although of low degree and short duration, can lead to a transient prothrombotic state.

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The main problems involved in the reconstruction of threedimensional profiles are related to the definition and resolution of a suitable equation set for the calibration of the whole system, and to the selection of proper criteria to discriminate whether matched points are confident or not. A complete system capable of extracting data and measurements from digital stereo images, obtained from aircraft or space sensors, is presented. Both area-based and featurebased techniques have been investigated. In order to perform an efficient point matching, the system makes use of criteria based on a modified test, taking into account the shape of the correlation function in a neighbourhood of its maximum. Some experimental results of automatic point matching are reported for different values of the characteristic parameters.

No abstract