The Designe And Implement Of Vibro-tactile Interface For Moble Termianls And Research On 3D Shape Rendering

Mobile terminals,as fast-growing personal computing and communication systems,have developed into an intelligent stage in recent years.However,in mobile field,human-computer interaction still relies on visual and auditory interaction.It has great limitations in haptic interaction.Haptic interactive technology can greatly enhance the quality of the human-computer interaction and extend the range of application areas and beneficiaries.Therefore,haptic interactive technology for mobile terminals has broad application prospects and market value.In consideration of the shortcomings of existing mobile haptic interaction.In this paper,a fingertip vibro-tactile interaction system for mobile terminals is designed.The system consists of fingertip vibro-tactile interaction device based on piezoelectric vibrator array and 3D shape rendering algorithm.This system is mainly used for image haptic interaction on mobile terminals,so that the operator can obtain the 3D shape information of the image by vibro-tactile stimulus when using the mobile terminal.Key techniques and innovations of this thesis are as follows:(1)In order to generate rich vibro-tactile stimulus,physical response of piezoelectric vibrator are measured,and subjective perception experiments of human response to piezoelectric vibrator are carried out.The experimental results show that the vibration intensity and rhythm of the piezoelectric vibrator can be controlled by adjusting and modulating voltage amplitude respectively.(2)A fingertip vibro-tactile interaction device for mobile terminals is designed with piezoelectric vibrator,force sensor and gesture sensor.The developed device is capable of providing vibro-tactile feedback and detecting the active force and gesture of finger within the interactive process(3)3D-image shape rendering algorithm based on the developed device is proposed.The algorithm is about combining with finger active press force,extracting the shape gradient and local surface direction as shape features,and then mapping them to vibration intensity and vibration location in the form of lateral force.The psychophysical experiments were carried out to find the shortcomings of the algorithm and improve it.The improved 3D shape rendering algorithm regards slip direction and finger gesture as input instead of finger active press force and takes contact point height,local gradient and contact state as 3D shape characteristics.And then mapping them to vibration intensity,location and rhythm.