Research On Automatic Configuration And Spot Control In Intelligent Sand Table

At present,sand table system has been widely used in various fields.In recent years,the new intelligent sand table system uses the combination of physical sand table and electronic sand table to display information.Physical sand table refers to the sand table model made of sand and other materials according to a certain proportion.It mainly uses laser pen for simple interaction.Electronic sand table is a new sand table system that integrates multimedia technology and physical sand table,Although the layout process is simple,the amount of display information is less,and the three-dimensional display of graphic information can not be realized.However,the current intelligent sand table system still has the following problems:(1)the target spot of the laser pen on the sand table or screen is very small,when the distance between the audience and the physical sand table or screen is far,it is difficult to see the spot.(2)The interactivity of the electronic screen is very poor,either it can only play the scheduled content,or it needs the demonstrator to use the laser pen / mouse control equipment to control the screen display content,which is inconvenient to control.(3)The control functions of physical sand table and electronic sand table are not compatible with one device,which brings inconvenience to the demonstration.Based on the existing solid sand table,an intelligent sand table system based on image recognition is designed to solve the problem of physical sand table and electronic sand table;The core function of electronic Sandtray mouse control based on infrared laser pen is realized,and the flexible interaction problem of electronic sand table is solved.The feasibility of the system is discussed in this paper.The experimental results confirm the availability of the core functions,which lays the foundation for the realization of the complete intelligent sand tray system.The main work of this paper is as follows:(1)A set of intelligent sand table system based on the combination of entity sand table and large screen display is designed.The system includes screen automatic configuration module,spot recognition module,coordinate conversion and cursor tracking module.The automatic configuration of screen is realized,and the relatively convenient human-computer interaction is realized by using laser spot.(2)A screen automatic configuration function based on image recognition is realized to match the coordinates of the corner points and cameras of the electronic display.The automatic configuration function does not strictly restrict the space placement position of camera and screen,but automatically calibrates the screen area corresponding to camera by analyzing the corresponding relationship between camera picture and feature point of screen display picture.(3)The virtual mouse control function based on infrared laser pen is realized to realize the flexible and convenient remote control of large screen.The technical flow of the control function includes: infrared spot extraction,coordinate conversion of spot(from camera coordinates to screen coordinates),virtual mouse control.