Research On Interaction Of Smart Wearable Devices Based On Magnetometer

Smart wearable devices(especially smart watches and wristbands)are becoming more and more popular in daily life.They can not only record people's daily activities,but also provide a new way for people to receive information.There is an urgent need for devices to interact.However,due to the limited touch screen size of smart wearable devices,text input is inconvenient and error-prone.Voice input is an alternative,but it is limited by the surrounding noise and it is not safe to input sensitive information.The design of new human-computer interaction methods for smart wearable devices has gradually attracted the attention of the industry and has important research and application value.This paper analyzes the shortcomings of the current smart wearable device interaction technology,and then proposes a set of input solutions for smart wearable devices based on magnetometers based on magnetic sensing technology to expand the interaction space between users and smart wearable devices.The main research results of this paper are as follows:1.According to the user's input habits,two input modes are designed:keystroke input and handwriting input.Users only need to wear a magnetic ring to design the back of the hand as a touch screen,and use the keystrokes or handwriting to input text to the smart watch.2.The key technologies involved in the text input scheme based on magnetometer are designed in detail,mainly including input event detection technology,feature selection technology,keystroke positioning algorithm,and character recognition algorithm.An initialization strategy and runtime adjustment mechanism are designed for the keystroke input mode to overcome the impact of watch position changes during runtime and improve the robustness of the system.3.Feasibility analysis of keystroke input mode and handwriting input mode respectively;designed a series of experiments to verify the accuracy of input event detection,keystroke positioning and handwriting recognition;detailed analysis of influencing factors during system operation;evaluation character recognition effect of handwriting input mode for new users.4.Designed and implemented the real-time acquisition system of sensor data for smart wearable devices and the interactive application based on magnetometer on commercial smart watches.This article first introduces the research background and significance of text input methods based on magnetometers,summarizes the existing smart wearable device interaction technology,and then studies and designs the keystroke input and handwriting input schemes based on magnetometers in detail.The system prototype was realized and the system was verified and analyzed by experiments.