Research On Electrostatic Force Tactile Representation Method Of Visual Texture

Tactile reproduction technology which involves electronics,computer,physiology,psychology and other disciplines,is the hot field of current virtual reality and human-computer interaction research.It can be widely used in telemedicine,game entertainment,education and teaching and military simulation and other important areas.Touching the mobile terminal screen with nudity to perceive the shape and texture of the displayed object,and realizing the rich and realistic tactile reproduction,is the trend of the development of the mobile terminal.The electrostatic force tactile reproduction technique is based on the nudge sliding and clicking,not needing to wear other devices,which has the advantages of high immersion and high interactivity,and is easy to integrate with the existing terminal screen,and is the main way to realize the tactile reproduction function on the mobile terminal one.Visual texture feature extraction and rendering algorithm is the key technology to realize tactile reproduction,and is also a guarantee to further improve the realism of tactile reproduction.The existing algorithms often characterize the tactile characteristics of the image by the amplitude change of the excitation signal,and the actual object has complex properties such as shape,texture and softness.How to make full use of the influence of the frequency and waveform of the excitation signal on the tactile sensation Electrostatic power rendering model,remains to be further studied.The main contents of this paper are as follows:(1)It is being studied that the tactile perception characteristics of human finger skin and electrostatic tactile display principle,collaborative work mode of the electrostatic tactile display system.The principle of haptic texture rendering is also explored using the method of gradient size to height value spreading to the lateral force to simulate the 3D texture and the tactile features of objects which people can feel the tactile texture information.(2)The tactile representation of image texture is researched through real-time mask to extract image texture tactile features,and the local image information of finger interaction point is only needed,which is reducing the amount of calculation.Electrostatic image texture haptic rendering model is established.The electrostatic tactile representation method which is suitable for high-definition image texture is put forward,and the factors to influenced haptic effect is also studied.(3)The tactile characteristics of frequency parameter,waveform parameters of tactile signal are studied.To solve the problem that electrostatic tactile display renders image texture information only through a single amplitude parameter so that it cannot display softness of the texture,we put forward the rendering method of the multi parameter which riches the tactile sensation of tactile display and improves the realistic of the haptic display.The main contributions and innovations of the thesis include:(1)This paper proposes a method based on 3D reconstruction images to display image texture of the bitmap digital image.Without geometric information by use of gray change between adjacent pixels of the image,we can obtain better tactile representation,reduce the amount of computation of haptic rendering process,and improve the speed of the real-time processing.(2)The perceptual characteristics of the frequency and waveform parameters of the electrostatic excitation signal are studied.A multi parameter haptic rendering model is proposed to improve the tactile representation of image texture.(3)A method of electrostatic tactile rendering based on color image texture is proposed,which is used to model the tactile features in color space.The method is based on the calculation of local interaction points,which effectively reduces the amount of computation,and is suitable for the electrostatic tactile reproduction of high definition image texture.As the electrostatic force tactile reproduction technology is high precision and real-time performance,this paper propose a methed of the high-definition images texture feature to provide reference for the research and application of electrostatic force tactile reproduction technology.