Design And Implement Of Large Screen Multimedia Interactive Display System

Twenty-first Century is the age of information technology, multimedia technology and network technology developed swiftly and violently, the visual perception of the increasingly high demand for all kinds of beautiful, large screen video images and pure color, rich image information, high quality and high definition display effect of the increasingly strong demand. Today, including engineering design, virtual manufacturing, simulation, astronomy, studio entertainment, interactive games and other graphical, applications to higher areas widely used in large screen multimedia display system. The large screen multimedia display system consists of LED large screen display technology and large screen projection technology.In a projection display devices, according to the projection means different, projection display is divided into positive projection and back projection in two ways. Rear projection is relative to the front projection character."Projection" is behind the projection display system, is a kind of loan projection and reflection principle, will screen and projection system in an imaging system. Say simply, just is the observer and located on the same side of the projector projection screen, projector projection from the emitted light output to a projection screen, the observer through the projection screen reflected light to see projected results; rear projection is the observer and the projector is located on both sides of the rear projection screen, projector is mounted on the fuselage bottom, projected from the projector out of the light to a translucent screen will have a portion of the light through, the observer through the light transmitted to see projected results.At present all kinds of large screen multimedia system in screen size, image display, picture clarity, actually reached shocking effects, but widespread screening single form, expensive, difficult assembly problems, not to mention the human-computer interaction, cannot cause the visitors with great interest, but not to the purpose of publicity. This paper introduces the design of a new large screen interactive multimedia display system, visitors watching the screen at the same time, can effectively participate in human-computer interaction, greatly aroused the enthusiasm of the visitors, visitors to display content more impressive. The system includes a projection reflex system, projection hard screen, projector, DLP projection, infrared touch frame, display content production software, the system has multiple modes of operation, its unique gesture operation, remote operated touch pen to maximally satisfy the operator’s requirements, the system has wide application range, applicable to the exhibition hall, enterprises and institutions, the service industry needs information interactive display or information in various places, market demand is big, market prospect very potential.The system design is the use of two cameras to get touch objects (such as a finger, touch pen, pointer etc.) in the virtual construction on the touch screen of one-dimensional position image, using intelligent image recognition and geometric projection technology, using software method through the coordinate mapping, touch object recognition, object locating, touch object action decision algorithm, realize large screen remote gestures virtual touch function.The system is equipped with can emit infrared laser point infrared laser pen, projection remote virtual touch function is to use the image sensor (or camera) access to the computer screen images and laser light spot on the screen in position image, using intelligent image recognition and geometric projection technology, using software method by laser spot identification, spot positioning, coordinate transformation, actions of the light spot judgment algorithm, realization of remote virtual touch function projection.The system is equipped with interactive multimedia display platform of information production, display data is convenient, flexible, this software has the electronic shelf management function, its function as the study bookshelf, related books are placed in the same book shelf, convenient management and view. Multimedia information display of the content is organized into book form, e-book by page, page can contain text, images, and text, pictures can also link to voice, video, animation, or book of the other pages, or even super link to another book, to achieve different themes of the multimedia information display.