The Research Of Digital Video Presenter Based On Hi3515

This topic is Tiancheng Technology Co., Ltd. of Taiyuan University of Technology project "based on the contents of Hi3515multimedia processing chip the video booth Research", and combined with the use of actual completion. In this project, the author mainly responsible for the development of the program part of the video presenter.Now day, due to characteristics of the digital image has a fast transfer capacity, high-capacity storage power, widely used in homes and production practices. In the school, the video presenter represented by digital image applications also accelerated into the people’s vision. Video presenter is also known as a physical display device, kind of projector. This is a combination of projectors and epidiascope. It can display variety of slides, models, documents and other objects on the projection screen through the video camera.Video presenter in the papers is basic on Hi3515multimedia processing chip which designed by Hisilicom Technologies Co.,Ltd. Data Width of this chip32-bit ARM9-based video hardware acceleration engine that can support a variety of interfaces. Since the focus of this article is that the development of the program, so just be a simple description of the board’s hardware.The video presenter development process:First PC Workbench programming, and then debugging and compile on the Linux server, last ran on the DMEB board. DMEB board system is embedded Linux system. So, among the mutual access and file sharing is particularly important. This article will focus on the transplantation of embedded Linux and NFS conFig.uration. DMEB which based the Hi3515multimedia processing chip through input interface will save the video image which take back by the CMOS camera. In this paper, by analyzing the video format and its storage in the memory to complete a series of functions such as the red and blue of the video decreasing and addition, image saving, brightness and chrome change.The most important technology in the video presenter is auto-focus function.In this paper,the video presenter had achieved auto-focus. In process of the design auto-focus, we put forward a new focusing algorithm and with the corresponding focus strategy to complete the real-time focus. The time of new focusing algorithm computing is short and can reflect the clarity of the overall. But the new focusing algorithm’s disadvantage is that the local extremum which leading to incorrect focusing. In order to achieve real-time focus, we developed a new focusing strategy which can determine whether there is phenomenon mistakenly focused.Moreover, according to the demanding of actual operation. This article describes the functions provided by interface function which provided by Hisilicom Technologies Co.,Ltd. achieve the function of input and output functions, two split-screen, video output window zoom in and out.In the finally, this article proposed the lack of video presenter then give the solutions and prospect the video presenter how to develop in the future.