OSD Software Design Of 3G Server Based On DaVinci DSP

OSD technology play an important role in the field of video services, and provide users with more useful information. This paper discusses a OSD software design of 3G sever. Compared to OSD special chips, it's more flexible.This paper firstly introduces relevant technical background of the topic, including the status and development of 3G server, OSD and DSP and the Concept of color space, and provides the research task and the significance of the research work. In the hardware platform, this paper generalizes the features of TI DaVinci DSP, and according to actual demand choses TMS320DM648 as the development platform, describes its structure, characteristics, strengths, and so on. And briefly introduces the development environment CCS.The main part of this paper, first describes the architecture, functionality of 3G server, and focuses on OSD software design and optimization. First it discusses in detail characters OSD, including the achievement of characters flashing, rolling and other effects. And then it presents the working principle of picture OSD technology, including the format of BMP, JPEG and GIF, describes the file format, image decoding and picture OSD. And also it gives the test result of character OSD and picture OSD. Finally it discusses the optimization of the OSD software including algorithm, code and data flow.The last of this paper concludes the research work of this software design, and the development in the future.