【作者】 黄一宁；

【导师】 刘济全；

【作者基本信息】 浙江大学 ， 电子信息技术与仪器， 2008， 硕士

【摘要】 OSD(On Screen Display)技术在视频服务领域发挥着重要的作用,为用户提供了更多的实用信息。本文针对DaVinci DSP,阐述了3G服务器的OSD软件设计。相对于OSD专用芯片,更具有灵活性。本文首先介绍了课题相关的技术背景,包括3G服务器、OSD、DSP的现状和发展以及颜色空间的概念,提出了本课题的研究内容与意义。在硬件平台部分,阐述了TI DaVinci DSP的功能特点,根据实际需求选择了TMS320DM648作为开发平台,具体阐述了其结构、特点、优势等。并对系统的开发环境CCS作了简要介绍。论文主体部分,在阐述了3G服务器的系统架构、设计方法、模块功能和工作流程后,重点论述了3G服务器的OSD软件设计及其优化实现。首先详细论述了字符OSD的工作原理与实现方法,包括字符闪烁、滚动、字体大小变化、前景背景叠加、多组叠加等各种效果的原理与实现。然后详细论述了图片OSD的工作原理与实现方法,主要包括BMP、JPEG、GIF三种图片格式的叠加,分别对三种图片格式进行了文件格式、图片解码和图片叠加的论述。同时给出了字符OSD和图片OSD的测试结果。最后提出了针对DaVinci平台的OSD软件的优化方法,主要从算法、代码和数据流三个方面进行了优化,提高了代码密度和运行效率。本文的最后对基于DaVinci DSP的3G服务器OSD软件的研究工作进行了总结,并对未来的发展作出了展望和规划。更多还原

【Abstract】 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.更多还原