In biometrics, the term "gait" is used to describe a particular manner or style of walking which is distinctive for each individual. Although gait shows a common pattern for everybody, it also presents some interpersonal differences which make possible individual identification. This fact may be observed in our ability to recognize a person only by observing his/her gait.
Due to the intensive use of mobile phones for different purposes, these devices usually contain confidential information which must not be accessed by another person apart from the owner of the device. Furthermore, the new generation phones commonly incorporate an accelerometer which may be used to capture the acceleration signals produced as a result of owner's gait. Nowadays, gait identification in basis of acceleration signals is being considered as a biometric technique which allows blocking the device when another person is carrying it.
In order to create a template for the person we want to study, it is important to analyze the similarity among the gait signals of the same individual at different speeds: slow, normal and fast. In the slow speed, the subject is asked to walk quietly as he was thinking about something. The normal speed corresponds to his usual walking speed. Last, for the fast speed, subject is asked to walk fast as they were arriving late to a meeting but without running.
We then create a template for each subject using gait cycles at all speeds. The decision of the ownership of a gait signal will be based on the distances to this template.
- Detecting whether a mobile device has been stolen by detecting changes in the gait signals.
- Blocking the device when another person is carrying it.
- Helping people who has health problems or is in danger (noticying what appears to be a fall from an old individual).