As a three-dimensional viewing technique, holography provides successful three-dimensional perceptions. The technique is based on duplication of the information carrying optical waves which come from an object. Therefore, calculation of the diffraction field due to the object is an important process in digital holography. To have the exact reconstruction of the object, the exact diffraction…
VIDEO streaming over cellular networks has been made possible in the last years by better performing video codecs and wireless cellular networks oriented to data transmission. The interaction between two heterogeneous worlds, the telecommunication infrastructure and the coding video software, calls for advanced optimization mechanisms. The actors involved in the optimization process are the cellular…
Currently, the telecommunications market has brought changes to the design of the old model of the telecommunications network. The emergence of new technologies for higher speed access was inevitable in order to meet the requirements of the appearance of the multimedia services (VoD, online gaming etc.). The latest technologies for broadband access over telephone pairs…
The radio astronomical community is currently developing and building several new radio telescopes based on phased array technology. These telescopes provide a large field-of-view, that may in principle span a full hemisphere. This makes calibration and imaging very challenging tasks due to the complex source structures and direction dependent radio wave propagation effects. In this…
Condition monitoring of machines through vibration analysis has been successfully applied on different types of machines for several decades. However, there are still some mechanical systems where its use has not given the same good results. Epicyclic gearboxes (EG) belong to this group of systems. Due to its special characteristics, EG are used in a…
Nowadays, diagnosis and treatment of brain tumors is based on clinical symptoms, radiological appearance, and often histopathology. Magnetic resonance imaging (MRI) is a major noninvasive tool for the anatomical assessment of tumors in the brain. However, several diagnostic questions, such as the type and grade of the tumor, are difficult to address using MRI. The…
The ultimate aim of research into computer vision is designing a system which interprets its surrounding environment in a similar way the human can do effortlessly. However, the state of technology is far from achieving such a goal. In this thesis different components of a computer vision system that are designed for the task of…
This thesis interests in different methods of image compression combining both Bayesian aspects and “sparse decomposition” aspects. Two compression methods are in particular investigated. Transform coding, first, is addressed from a transform optimization point of view. The optimization is considered at two levels: in the spatial domain by adapting the support of the transform, and…
