微格教学系统中视频采集与处理技术研究

发布时间：2019-04-24 17:24

【摘要】：微格教学广泛应用在心理学、教育学、学科教学法、师范教育等领域，它吸纳了很多先进的教学思想和理念，对提高教学质量特别是师范生的教学技能起到了十分重要的作用。随着现代化信息技术尤其是多媒体技术的不断发展，为学校实现教学设备智能化、教育管理现代化以及教学手段多样化提供了发展机遇。本微格教学系统融入了计算机网络技术、嵌入式电路技术和音视频技术，为开展有效的教学技能培训构建了一个良好的平台，为教学过程反馈和教学评价提供了现代化的手段。本课题的设计以DirectShow流媒体处理平台和H.264/AVC视频编码的研究为基础，结合内部集成有H.264硬件编码器的多路视频编码芯片SC8919，设计了一款集多媒体课堂教学、多路视频的录制、存储、传输、回放功能于一体的微格教学视频处理系统。该系统能够将摄像头所采集的四路D1(720*576@25fps)格式的图像数据实时压缩成为标准的H.264码流，并上传至监控室（控制室和观摩室）的PC机进行存储和解码播放。并依靠院校已有的以太网平台进行传输，无需另外铺设专线。系统提供友好的操作界面，方便用户操作和使用。通过实际的制作和调试，各项技术指标达到设计要求。本文在分析选题意义的基础上，规划出系统的总体设计方案，包括视频采集模块、PCI数据总线交互模块、视频服务器模块和网络传输模块。之后对课题设计过程中涉及的H.264/AVC视频编码标准和DirectShow流媒体处理平台进行了描述。其次，介绍了以SC8919为核心的视频采集模块的硬件电路设计，，同时讨论了该模块主要芯片的功能和应用。然后，介绍了视频服务器的设计，这部分设计是建立在充分研究和掌握SC8919芯片的内部资源使用基础上，并从多线程设计、系统初始化设计、DirectShow滤波器设计和系统界面设计等几个方面给出了详细的设计方法，并描述了硬件和软件调试的过程。最后，介绍了网络传输模块的设计过程。
[Abstract]:Micro-teaching is widely used in psychology, pedagogy, discipline teaching method, normal education and other fields. It absorbs many advanced teaching ideas and ideas, and plays a very important role in improving the teaching quality, especially the teaching skills of normal students. With the continuous development of modern information technology, especially multimedia technology, it provides a development opportunity for the school to realize the intelligentization of teaching equipment, the modernization of educational management and the diversification of teaching means. This micro-teaching system integrates computer network technology, embedded circuit technology and audio-video technology. It constructs a good platform for effective training of teaching skills, and provides a modern means for teaching process feedback and teaching evaluation. Based on the research of DirectShow streaming media processing platform and H.264/AVC video coding, this paper designs a multi-channel video coding chip SC8919, which integrates H.264 hardware encoder, and designs a multimedia classroom teaching. Multi-channel video recording, storage, transmission, playback functions in one microteaching video processing system. The system can compress the four-channel D1 (720*576@25fps) format image data collected by the camera into a standard H.264 stream in real time, and upload it to the PC of the monitor room (control room and observation room) for storage and decoding. And rely on the existing university Ethernet platform for transmission, no need to lay another dedicated line. The system provides a friendly interface for users to operate and use. Through the actual production and debugging, the technical indicators meet the design requirements. On the basis of analyzing the significance of the selected topic, this paper plans the overall design scheme of the system, including video capture module, PCI data bus interaction module, video server module and network transmission module. Then the H.264/AVC video coding standard and DirectShow streaming media processing platform involved in the design process are described. Secondly, the hardware circuit design of the video capture module based on SC8919 is introduced, and the function and application of the main chip of the module are discussed. Then, the design of video server is introduced. This part of the design is based on the full research and grasp of the use of internal resources of the SC8919 chip, and from the multi-thread design, system initialization design, The detailed design methods of DirectShow filter and system interface are given, and the debugging process of hardware and software is described. Finally, the design process of network transmission module is introduced.
【学位授予单位】：宁波大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：G642.4;TP391.41

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