We consider an X ray computed tomography (CT) image reconstruction problem where we want to include some geometrical informations coming from anatomical atlas and propose new methods based on hierarchical Markov modeling and Bayesian estimation approach. We use two kinds of anatomical information: partial knowledge of values in some regions and partial knowledge of the edges of some other regio...

Understanding the process of categorization is a primary research goal in artificial intelligence. The conceptual space framework provides a flexible approach to modeling context-sensitive categorization via a geometrical representation designed for modeling and managing concepts. In this paper we show how algorithms developed in computational geometry, and the Region Connection Calculus can be...

The fundamental basis of any cognitive system is perception all reasoning is based on it. In the past, a lot of research has been done to achieve a sophisticated environment model. However, most of the approaches are based on geometrical reconstruction, which is not sufficient for several scenarios. In this paper, we investigate image-based localization and environment modeling to provide a rob...

This paper deals with 3D modeling of complex architectural elements for virtual 3D scene reconstruction based on images or point clouds. It presents a new method at the opposite of classical photogrammetry and lasergrammetry techniques: parametric components are created and then adapted to the measured data. We have conceived and developed a parametric shape generator tool for virtual 3D recons...

Learning based incremental 3D modeling of traffic vehicles from uncalibrated video data stream has enormous application potential in traffic monitoring and intelligent transportation systems. In this paper, video data from a traffic surveillance camera is used to incrementally develop the 3D model of vehicles using a clustering based unsupervised learning. Geometrical relations based on 3D gene...

An updated program for modeling simplified heart geometry and simulation of action potentials propagation is presented. The implemented model allows simulation of geometry changes as well as changes in action potentials amplitude and duration. In propagation simulation real conduction velocities can be considered. Two different pathological situations were simulated using the model. First, only...