Design Of Intelligent Visual Presenter Based On Hi3515

Visual presenter, known as a kind of digital video projector, makes objects, pictures, documents and other information converted into the image signal and displays the image signal through the projector, monitor, and other display devices. Digital visual presenter has many advantages, such as high picture quality, true color, screen anti-shake, and it’s easy to be extended and valueable in commercial. This paper uses the2million pixel CMOS digital image sensor kit which has high rate of quantity and price to complete the work of image acquisition, the Hi3515video codec processor to process the acquired image data, and display the image data througth the CVBS or VGA interface to the display devices. In order to make the digital visual presenter more intelligent, this paper added the new function combined with the whiteboard compared with the traditional visual presenter, and the new function makes Hi3515platform replace the PC. The main work of this paper is as follows:(1) the overall hardware designIt completes the design of image acquisition, image processing, image output, and part of the hardware control circuit.(2)the establishment of embedded development environmentIt sets up the LAN development environment based on the NFS server mode, so that project team members could share one development board and one Linux server which can be used to compiler the software program. And it configures cross-compiler environment.(3) the realization of auto-focusThe Image clarity evaluation function which is suitable for embedded systems is found. Then combined with a focused strategy, then it achieves the fast and accurate auto-focus function.(4) driver developmentIn order to reduce the response time of the system functions, in this paper some function is completed in the driver program, which can meet the user’s real-time requirements.(5)the design of communication program between Hi3515and whiteboardIt completes the development of communication program between Hi3515and whiteboard, and the design and realization of screen coordination mapping.The digital visual presenter designed in this paper is easy to be developed, and has high value in commerce. In the study area of traditional visual presenter, this paper has opened up new areas of research. In the days of multimedia teaching and modern meeting, the intelligent digital visual presenter must have a new bright future.