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Theses

Transmission d'images sur les réseaux de capteurs sans fil sous la contrainte de l'énergie

Abstract : Among the many potential applications of wireless sensor networks (WSNs), those using image sensors are valuable for object detection, recognition, localization,
counting, and tracking. Small and low-power image sensors already exist but special challenges for energy-efficient, low-complexity image processing and communication in WSN must be addressed.
The contribution of this thesis focuses on two aspects. First, we have proposed an image transmission scheme based on discrete wavelet transform (DWT) and semireliable transmission to achieve energy conservation. The DWT allows for image decomposition
into separable subbands for multiresolution representation purposes. As a result, image data can be divided into priority levels. In this way, fully reliable data transmission is only required for the lowest resolution level. The remaining data can be handled with a semireliable transmission policy in order to save energy. Nodes located between the image source and the sink can decide to drop some packets in accordance
with the packet priority and the batteries' state-of-charge.
Secondly, we addressed aspects of image processing and coding at the source image sensor, and we have proposed a very-low complexity compression algorithm combined with a technique of pixels mixing based on torus automorphisms . Experiments on a platform of real image sensor network have been conducted to demonstrate the validity of our proposals, by measuring aspects such as the amount of memory required for the implementation of our software algorithms, their consumption energy and their execution time,
and the quality of reconstructed images under packet losses conditions.
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Submitted on : Wednesday, September 16, 2009 - 10:10:11 AM
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Cristian Duran-Faundez. Transmission d'images sur les réseaux de capteurs sans fil sous la contrainte de l'énergie. Réseaux et télécommunications [cs.NI]. Université Henri Poincaré - Nancy I, 2009. Français. ⟨tel-00417505⟩

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