Mobile phone wearing mode-oriented falling event detection system and method

Abstract

The invention discloses a mobile phone wearing mode-oriented falling event detection system and a mobile phone wearing mode-oriented falling event detection method. The system comprises an acceleration sensor installed on a mobile phone, and a data acquisition module, a falling pre-judgment module, a characteristic extraction module and a falling judgment module, which are sequentially connected with the data output end of the acceleration sensor. The method comprises the following steps that: firstly, the data acquisition module continuously acquires a wearer motion variation sensed by the acceleration sensor, squares components of three directions of acceleration, summates squares, extracts a sum, calculates a module of an acceleration vector, and simultaneously maintains a cache for recording historical acceleration information; secondly, the falling pre-judgment module periodically reads the data cache maintained by the data acquisition module, and judges whether falling possibly happens or not; thirdly, the characteristic extraction module acquires acceleration variation data a plurality of seconds before and after an event from the data acquisition module, and calculates characteristic components; and finally, the characteristic extraction module generates a characteristic vector by using the obtained characteristic components, and inputs the characteristic vector into the falling judgment module, and the falling judgment module which is obtained according to distinction motion training required by the use of the mobile phone judges whether the event belongs to a falling event or not.

Description

technical field [0001] The invention belongs to the field of motion sensor signal analysis, and in particular relates to a fall event detection system and method oriented to a mobile phone wearing mode. Background technique [0002] Falls are one of the main factors that endanger the health of people in need of care, especially the elderly. Timely detection and treatment after falls can greatly reduce the pain of patients and avoid further injuries. For the detection of falls in personal daily activities, it is often used to allow users to wear motion sensors such as accelerometers, gyroscopes, and magnetometers, which have the advantage of being easy to use. After acquiring the sensor signal, it is necessary to determine some features related to the fall and compare it with a threshold to determine whether a fall has occurred. Invention patents with application numbers CN201110059324.9 and CN201110059236.9 propose a method for judging whether a fall is based on detection o...

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Problems solved by technology

[0004] In order to overcome the deficiencies of the above-mentioned prior art, the purpose of the present invention is to provide a fall event detection system and method oriented to the wearing mode of mobile phones, which solves the problem that automatic judgment is required when a fall occurs while using a mobile phone

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