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Sensor devices are inevitable for realizing intelligent environments by obtaining the physical-world status. Their functions are normally self-contained and merely provide input values to the processing unit. However, sensors are becoming easy to be connected to the Internet and thus our group proposed the notion of SWNW, abstracted sensors utilizing the knowledge at remote servers. In this paper, we describe an enhanced implementation of SWNW using HTTP and an instance of SWNW as HTTP-based Location Sensor using Images (HLSI). HLSI consists of a server maintaining an image database and clients, normally smartphones, capturing images and exchanging information with the server. This paper describes the design and implementation of HLSI.
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