【作者】 张毅；

【导师】 王天江；

【作者基本信息】 华中科技大学 ， 计算机应用技术， 2007， 硕士

【摘要】 远程医疗是包括远程会诊在内的一个新的医疗方式和技术发展,他是近年来在远程会诊的基础上发展起来的,由于计算机网络技术的迅猛发展,为远程医疗技术的实施提供了可靠的技术保障,使专家医生和患者间的时间和空间上的限制得以通过“远程医疗”技术跨越,方便了患者。基于流媒体技术,设计了一个视频交互的远程医疗系统,对设计的基本技术做了深入的探讨,并进行了软件实现。基于H.264协议的多媒体压缩技术,给出了在H.264视频传输中的一种误码恢复技术——数字水印技术。在编码器端,对于每一个H.264帧,每个宏块中的特征数据将被提取出来,用于生成独一无二的水印,并镶嵌在当前帧中。在解码器端,通过数学方法将嵌入的水印还原,并进行比较。如果水印没有错误,则当前帧是可信任的。否则将利用水印数据将当前帧近似恢复。在此基础上运用Web Service技术,结合RTP/RTCP协议、在.NET框架平台上设计并初步实现了一种远程医疗系统平台原型。系统采用基于Web服务的分布式多层系统架构,客户端程序采用基于浏览器的胖客户端,业务逻辑以Web服务的形式出现,业务逻辑流程采用XML文档进行描述并且为系统设计了数据库访问的统一接口。该系统不仅仅提供了完整的在线医疗的解决方案,而且对医疗视频的实时采集、编码、传输和回放进行了编码实现。更多还原

【Abstract】 Telemedicine, including long-distance diagnosis of a new medical methods and technology development, he is in long-distance diagnosis in recent years on the basis of developed, the rapid development of computer network technology for the implementation of telemedicine technology to provide reliable technical support. The expert doctors and patients between the time and space constraints to the adoption of "telemedicine" technology leap for the patients. To design and develop distance telemedicine system based on streaming media is discussed in this thesis. The relative technology has been researched and the system has been realized with software.In this study, a digital watermarking method be used in H.264 video transmission is proposed. At the encoder, for an H.264 frame, the important data for each macroblock are extracted to become the unique watermarking for this frame then embedded it into the frame by a relationship of transform coefficients for differing transforms. At the decoder, if the extracted watermarking is correct, then can know that the important data of macroblocks in the frame will be trusted. If not, then can the mathematical method will recover the error approximately.This thesis expounded the Web Service Technology firstly, and then discusses the limit of the TCP, RTP/RTCP protocol and RTP payload format for H.264 visual streams. Finally, a feasible project of distance telemedicine prototype system is designed. It depends on .NET technology. The components, such as the real-time sample, video encoding, video decoding and display, are programmed and tested.更多还原