Abstract
Recent developments in smartphones have increased the processing capabilities and equipped these devices with a number of built-in multimodal sensors, including accelerometers, gyroscopes, GPS interfaces, Wi-Fi access, and proximity sensors. Despite the fact that numerous studies have investigated the development of user-context aware applications using smartphones, these applications are currently only able to recognize simple contexts using a single type of sensor. Therefore, in this work, we introduce a comprehensive approach for context aware applications that utilizes the multimodal sensors in smartphones. The proposed system is not only able to recognize different kinds of contexts with high accuracy, but it is also able to optimize the power consumption since power-hungry sensors can be activated or deactivated at appropriate times. Additionally, the system is able to recognize activities wherever the smartphone is on a human's body, even when the user is using the phone to make a phone call, manipulate applications, play games, or listen to music. Furthermore, we also present a novel feature selection algorithm for the accelerometer classification module. The proposed feature selection algorithm helps select good features and eliminates bad features, thereby improving the overall accuracy of the accelerometer classifier. Experimental results show that the proposed system can classify eight activities with an accuracy of 92.43%.
Highlights
Context recognition is a highly active research area due to its large number of potential applications such as in healthcare, virtual reality, security, surveillance, and advanced user interface systems
The category is still limited by a small number of contexts, we have demonstrated that our multimodal sensor approach has the potential to recognize different kind of contexts
We have proposed a multimodal approach by utilizing the set of embedded sensors on smartphones in order to recognize different user contexts, such as walking, jogging, riding on a bus, or taking a subway
Summary
Context recognition is a highly active research area due to its large number of potential applications such as in healthcare, virtual reality, security, surveillance, and advanced user interface systems. As a result, it has caught the attention of researchers from industry, academia, security agencies, consumer agencies, and even the general populace. It has caught the attention of researchers from industry, academia, security agencies, consumer agencies, and even the general populace Several years ago, such context aware systems were mostly based on complicated wearable sensors, which are not even commercially available nowadays. A comprehensive recognition system should make use of all those sensors in order to be capable of recognizing a higher number of mixed contexts including ambulatory, transportation, and acoustic. A system that recognizes transportation by inferring the user‘s GPS route [11] can stop collecting GPS data if an accelerometer classifier detects that the user is walking
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