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Sensor Data and Image Processing

The recent improvements in mobile technologies are fostering the emergence of ubiquitous environments in which the user is able to access, create and share information at any location with considerable ease. Moreover, mobile devices have become an essential part of distributed architectures that can be used for monitoring the context of the user (e.g. location, situation, etc.), and thus reacting in a proactive way. On the other hand, smart phones are equipped with a variety of sensors (GPS, magnetic field, etc.) that enrich the mobile applications with location awareness and sensing capabilities. These advances enable fitting contextual requirements for improving the quality of service (QoS) in the applications as it allows adapting the interaction between the handset and the user in real-time. For example, a sensor such as the accelerometer is used for sensing how the user is holding the handset, and thus changing the position of the screen as a result.

The accelerometer is a sensing element that measures the acceleration associated with the positioning of a weight in which it has been embedded (e.g. a mobile device). Depending on the number of axes, it can gather the acceleration information across multiple dimensions. In the case of a triaxial accelerometer that is the most common in mobiles from vendors such as HTC, Samsung, Nokia etc., the acceleration can be sensed on three axes (x, y and z). The axes are related with the movements forward/backward, left/right and up/down, respectively. For example: in the case of a runner, up/down is measured as the crouching when he/she is warming up before starting to run, forward/backward is related with speeding up and slowing down, and left/right involves making turns while he/she is running.


Research staff



Master theses

Kaarel Hanson - Context Sensor Data on Demand for Mobile Users Supported by XMPP (2012)