Research And Implementation Of Mobile Pervasive Display System Based On Smartphone

Smartphone is playing an increasingly important role in people's work and life now.It is not just a call tool,but gradually transformed into a channel providing a full range of information and entertainment services.It is gradually popular among people's work and life and brought great convenience,people are increasingly inseparable from the smartphone.Because of the purpose of using the mobile phone,it has a portability restrictions.In today's technical conditions,if the size of the smartphone's screen is particularly large,it will lose portability.But there is a requirement of large display size.In this thesis,a large number of smartphones are combined to carry out information display by using pervasive display technology.Every smartphone acts as one pixel of the whole picture.So they can show a very big picture together.A plurality of smartphones each perform the corresponding display task,all the display devices in the display area are combined together to form the pattern on a large scale.According to the above principles,this thesis designed a mobile pervasive display system which contains multiple Android smartphones.The number of smartphones which needed to achieve this system's goal can't be too few,a single smartphone cannot use this system to achieve the purpose of display in a large size.The system consists of a server and a mobile client.It supports all the functions of the requirement,including a variety of positioning methods,upload task,model creation,zoning methods,task scheduling and distribution.The simulation in the last chapter of this thesis verifies the effectiveness of the entire system.The main research content of this thesis is to determine the best display area of the display task such as picture and text when the display area is incomplete.In order to achieve this goal,this thesis designs a selection strategy of display area and a method of task matching,which includes a preprocessing method for meshing the user points,a dynamic programming algorithm to determine the best display area for the picture display task and propose a program to extract the contour to optimize the display.For the character display task,this thesis proposes 2D-Rabin-Karp,a two-dimensional pattern approximation matching algorithm.The algorithm first extends the Rabin-Karp algorithm from one-dimension to two-dimensions,and then adds a fast calculation method of matching degree.The algorithm isvery suitable using in this application scenario.These research results are all integrated in the server-side computing module.