Motion Reference Image JPEG2000 : Road surveillance Application with wireless device

WOS:000232176403013International audienceThis paper deals with a new codec based on the JPEG 2000 standard that will use a market hardware codec in order to build a road surveillance device. The developed coder consists in 4 processing steps, namely construction of a reference image, foreground extraction (ROI mask), encoding with JPEG 2000 and transmission through a wireless device. A …rst order recursive …lter is used to build a reference image that corresponds to the background image and the updated reference image is computed according to a mixture of Gaussians model. The system builds a reference image and transmits it towards a decoder through the GSM network. After the initialization phase, the reference image is updated automatically according to a Gaussian mixture model, and when the ROI can be considered as null, a piece of the updated background image is sent. We perform motion detection in order to extract a binary mask. The motion mask gives the region of interest for the system. The current image and the motion mask are coded using the ROI option of JPEG 2000 codec with a very low bit rate and transmitted towards the decoder. The complete scheme is implemented and it reaches the expected performances. We also showed how the local background image is built and updated at each frame. We presented the strategy in order to update smoothly the remote background image. The implementation runs at 5-8 frames per second on a 1.8 GHz AMD processor for 320x240 color images

Геометрические модели и прогнозирование многоракурсных изображений на основе компенсации движения камеры

Geometrical models of formation and prediction of multi-angle images are proposed. On the basis of these models for different methods of motion compensation the dependences of the compression ratio from the conditions of the forming of the multi-angle images and from the path of the camera moving are defined. Algorithms for coding of the multi-angle images with adaptive prediction based on motion compensation with different computational complexity are developed. An assessment of the effectiveness of multi-angle image encoders with adaptive prediction is produced.Предложены геометрические модели формирования и прогнозирования многоракурсных изображений. На основе данных моделей для различных методов компенсации движения определены зависимости коэффициента сжатия от условий формирования многоракурсных изображений и траектории перемещения камеры. Разработаны алгоритмы кодирования многоракурсных изображений с адаптивным прогнозированием на основе компенсации движения с различной вычислительной сложностью. Произведена оценка эффективности кодеров многоракурсных изображений с адаптивным прогнозированием

Design Issues of Reserved Delivery Subnetworks, Doctoral Dissertation, May 2006

The lack of per-flow bandwidth reservation in today\u27s Internet limits the quality of service that an information service provider can provide. This dissertation introduces the reserved delivery subnetwork (RDS), a mechanism that provides consistent quality of service by implementing aggregate bandwidth reservation. A number of design and deployment issues of RDSs are studied. First, the configuration problem of a single-server RDS is formulated as a minimum concave cost network flow problem, which properly reflects the economy of bandwidth aggregation, but is also an NP-hard problem. To make the RDS configuration problem tractable, an efficient approximation heuristic, largest demands first (LDF), is presented and studied. In addition, performance improvements with local search heuristic is investigated. A traditional negative cycle reduction and a new negative bicycle reduction algorithms are applied and evaluated. The study of RDS configuration problems is then extended to multi-server RDSs. The configuration problem can be similarly formulated as the single-server RDS configuration problem; however, the major challenge of multi-server RDS configuration is the optimal server locations. A number of server placement algorithms are evaluated using simulations. The simulation results show that a class of greedy algorithms provide the best solutions. In addition to configuration problem, the dynamic load redistribution mechanism is studied to improve the tolerance to server failures. A configuration algorithm to build redistribution subnetworks is proposed and evaluated to deal with single server failures in a group of servers. Besides the exclusive bandwidth access, there are potentials to further improve end-to-end performance in an RDS because end hosts can utilize the knowledge about the underlying networks to achieve better performance than in the ordinary Internet. These improvements are illustrated with a source traffic regulation technique to resolve the unbalanced bandwidth utilization problem in an RDS. A per-connection and an aggregated regulation algorithm for single-server and multi-server RDSs are presented and studied