Otimizações da transmissão de imagens em redes de sensores visuais sem fio explorando a relevância de monitoramento dos nós fontes e codificação DWT
The development of wireless sensor networks for control and monitoring functions has created a vibrant investigation scenario, covering since communication aspects to issues related with energy efficiency. When source sensors are endowed with cameras for visual monitoring, a new scope of challeng...
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| פורמט: | doctoralThesis |
| שפה: | por |
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Universidade Federal do Rio Grande do Norte
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| גישה מקוונת: | https://repositorio.ufrn.br/jspui/handle/123456789/15216 |
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| סיכום: | The development of wireless sensor networks for control and monitoring functions
has created a vibrant investigation scenario, covering since communication aspects to issues
related with energy efficiency. When source sensors are endowed with cameras for
visual monitoring, a new scope of challenges is raised, as transmission and monitoring
requirements are considerably changed. Particularly, visual sensors collect data following
a directional sensing model, altering the meaning of concepts as vicinity and redundancy
but allowing the differentiation of source nodes by their sensing relevancies for the application.
In such context, we propose the combined use of two differentiation strategies as a
novel QoS parameter, exploring the sensing relevancies of source nodes and DWT image
coding. This innovative approach supports a new scope of optimizations to improve the
performance of visual sensor networks at the cost of a small reduction on the overall monitoring
quality of the application. Besides definition of a new concept of relevance and
the proposition of mechanisms to support its practical exploitation, we propose five different
optimizations in the way images are transmitted in wireless visual sensor networks,
aiming at energy saving, transmission with low delay and error recovery. Putting all these
together, the proposed innovative differentiation strategies and the related optimizations
open a relevant research trend, where the application monitoring requirements are used to
guide a more efficient operation of sensor networks |
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