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1、硕士学位论文（工程硕士）手机视频驱动系统的设计与实现THE DESIGN AND IMPLEMENTATION OFMOBILE VIDEO DRIVER SYSTEM冯永生2008 年 10 月国内图书分类号：TP751国际图书分类号：621.3工程硕士学位论文手机视频驱动系统的设计与实现硕 士 研 究 生： 冯永生导师： 李全龙 副教授副导师： 俞青 高级工程师申请 学 位： 工程硕士学 科 、 专 业： 软件工程所 在 单 位： 软件学院答 辩 日 期： 2008 年 10 月授予学位单位： 哈尔滨工业大学Classified Index: TP751U.D.C.: 621.3Disse
2、rtation for the Masters Degree in EngineeringTHE DESIGN AND IMPLEMENTATIONOF MOBILE DRIVER SYSTEMCandidate：Supervisor：Associate Supervisor：Academic Degree Applied for：Speciality：Affiliation：Date of Defence：Degree-Conferring-Institution：Feng YongShengAssociate Prof. Li QuanlongSr. Engineer Yu QingMas
3、ter of EngineeringSoftware EngineeringSchool of SoftwareOctober, 2008Harbin Institute of Technology哈尔滨工业大学工程硕士学位论文摘要随着手机功能不断的推陈出新以及手机价格的不断下降，手机已成为人们生活当中不可缺少的交流和沟通工具。随着彩信业务的推出，拍照手机已成为目前的消费热点，几乎成为手机中的标配。当前拍照手机主流都是内置式拍照手机，手机内部内嵌了视频处理器，视频处理器决定了拍照功能及图像品质，而功能及图像质量的稳定又与视频处理器驱动设计的好坏密不可分。有的驱动程序虽然功能强大，但不易于移植及
4、扩展，有的驱动程序虽易于移植，但稳定性较差，从而导致产品延期，甚至失败等问题，因此驱动设计在手机产品开发中占有非常重要的地位。手机视频处理器驱动系统正是本论文研究的主要内容。本论文首先了解视频处理器芯片的硬件内部架构，并能清晰的理解该芯片的各个功能模块的工作原理，分析芯片内部每个模块之间是如何进行命令数据交互的。然后根据芯片的功能模块、控制流及数据流，最终分析出视频驱动的模块划分及层次结构。接着分析各种手机平台系统的特点，构建设备驱动程序的架构及功能结构图。针对手机嵌入式系统的资源限制，尽可能让程序代码空间要尽量小，内存变量空间尽量小，功能稳定，容错性强，易于移植及升级。重点研究 JPEG 图
5、像插值放大的算法，以及 JPEG 图像插值放大时的调整和优化。根据嵌入式驱动测试方法，分别对模块功能测试、集成测试、性能测试编写相应的测试用例，利用上位机测试程序控制视频处理器测试板，灵活地进行全方位的测试和评估。通过以上提到的几个方面的工作，使整个手机视频处理器驱动系统在内存空间，代码空间以及执行速度上得到较明显的优化，JPEG 图像插值放大功能的实现为本系统增加了新的亮点，已开始在各种手机平台项目中应用，得到手机设计公司的认可。关键词嵌入式系统；视频驱动程序；驱动程序测试-I-哈尔滨工业大学工程硕士学位论文AbstractDue to the rapid improvement in ce
6、ll-phones functionality, as well as thecontinuous decline in cell-phones price, cell-phones have become anindispensable communication tool to peoples lives. With the introduction ofMultimedia Message Service business, camera phones have already become newconsumption growth area, and almost have beco
7、me the standard in the cell-phone.Built-in camera phones are the mainstream of Camera phones. Built-in cameraphones have the embedded video processor, which determines the features ofcamera and image quality. The driver design quality of built-in camera phonesinseparably affects the stability of cam
8、era and image quality. Some drivers arepowerful, but hard to expand; In contrast, some drivers are easy to expand, butnot stable, leading to product delays, even failure. Therefore, the driver designplays a critical role in the cell-phone product development. This paper focuses onthe design of cell
9、phone video processor driver system.Firstly, we understand the internal structure of video processor chiphardware, and the working principle of modules within a chip, especially on howdata-flow and control-flow are communicated among these modules.Secondly, based on our understandings on chip-intern
10、al modules, and ourunderstandings on the “data-flow”, “control-flow” among them, we are able toget the analysis of module division and hierarchical structure for video driver.Thirdly, we characterize the mobile phone platform systems, and propose thevideo driver program design and video driver funct
11、ional component graphaccordingly. Fourthly, we propose a programming solution with smaller codespace and smaller memory requirement so as to address the resource limitationproblems of mobile phone embedded systems. Our solution is shown to be stable,error-tolerant, easy to expand and upgrade. Fifthl
12、y, we propose a JPEG imageenlargement interpolation algorithm. Our algorithm is superior in the imageadjustment and optimization during the enlargement interpolation. Sixthly, weapply embedded driver testing methods to the module function testing,integration testing and performance testing. We make
13、use of PC video processortest control board to flexibly conduct comprehensive testing and evaluation.- II -哈尔滨工业大学工程硕士学位论文In summary, our work substantially improves the memory space, code spaceand the execution speed of cell-phone video chip driver. Our proposed andimplemented JPEG image interpolation zoom system is innovative. It has beenadopted by several mobile phone design companies, and been applied to severalcell phone platform projects.Keywords Embedded system, Video Driver, Driver Testing- III -哈尔滨工业大学工程硕士学位论文目录摘要 .
