Principle Multi-touch interactive system sensing enables a user to interact with a system with more than one finger at a time, as in chording and bi-manual operations. The system could achieve the effect of imige clicking, reducing, enlarging, whirling, and dragging. Such sensing devices are inherently also able to accommodate multiple users simultaneously, which is especially useful for larger interaction scenarios such as interactive walls and tabletops. With the system, users can not only watch high-quality projection image, but also inquire certain information of his interest by touching the glass cover surface. The system will display pre-set information automatically while it has been idle for a certain period, and switch into the interactive mode when it is touched. Components There are four components in the multi-touch interactive system: 1. Signals receiver: catch shooting according to the demand , the video equipment must be high-quality cameras; 2. Core control software: analyzing the updating data , the program is built in the computer system; 3. Imaging: present the images in a specific place by using projector or other imaging equipment. In addition to projector, plasma displays, LCD displays, rear projection screen can be used as interactive image carriers. 4. Auxiliary equipment: such as transmission lines, installation components, audio devices, Infrared lights and so on. Installation and Operation The projector could be set on the ceiling of the roof behind the screen or placed inside a machine box together with the sensor and computer. It is also possible to integrate the whole system as an information kiosk station. Environment condition: 1. 2-meter-high screen, within the hand's reach 2. 2 meters distance between the projector and the screen 3. Maximal 3 meters of the sensor's sensing distance 4. Enough ambient light in front of the screen Application field 1. Public Transportation Information System 2. Information Inquiry System for hotels, office buildings and other venues 3. Interactive Digital Shop Window for departments and shopping malls 4 Information Inquiry System for Exhibitions 5. Intelligent large-screen monitor& control system for service departments 6 Guiding, Display and Information Inquiry System for flagship stores 7. Presentation System for meeting rooms 8. Multi-media Presentation System for Enterprise Showroom System Parameters Screen Dimension: 4:3,16:9, 40inch-120inch ( >120inch should be ordered) Accuracy: 5mm Calibration: calibrated by driver programs Sensitivity: adjusted by software Operation System: Windows 2000/XP Transparency: >90% Temperature for working: -40degree~+70degree Humidity: 0%~95% Distance from sensor to screen: min:0.5m; max: 3m Height from sensor to screen center: +/-1.5m Installation The customer should provide a plan of the venue (or specific parameters) on the conclusion of the contract. Our company is responsible for the design and installation at the arrival of goods according to the clients' needs. We also provide the templet procedures to display. To ensure good performance of the system, please make sure that there is no strong light or high-power lamp near the front or the back of the screen.