基于HDLC协议的图像实时压缩传输技术研究  

Research on Image Real-time Compression and Transmission Technology Based on HDLC Protocol

作　　者：张修建[1] 梁伟伟[1] 王兵[1] 赵茜[2] 靳硕[1] 

机构地区：[1]北京航天计量测试技术研究所,北京100076 [2]华北计算技术研究所,北京100083

出　　处：《计算机测量与控制》2018年第2期203-206,共4页Computer Measurement &Control

基　　金：中国航天科技集团公司计量研究项目;中国运载火箭技术研究院技术创新基金课题

摘　　要：针对航天某领域视频监测需求,解决在图像传输过程中误码率较高,传输链路可靠性较低的问题,提出了一种基于HDLC协议的图像实时压缩传输系统;在给出系统体系结构的基础上,对视频压缩算法、码流控制和环形缓冲区算法进行了研究分析,介绍了图像实时压缩传输技术的设计和软件实现方法,采用多线程技术设计了两种视频监测模式,采取编码器结构优化和压缩算法优化等技术途径,保证图像压缩的实时性和正确性,实现了多路视频的单路切换和多路并行两种模式下的视频监测技术;该系统保证了码流的平稳发送并按照HDLC协议传输至测试台控制单元中,连续运行5小时内无图像丢帧,并能够准确地表达剧烈突变的运动,性能可靠,在应用中取得了良好的效益。According to the video surveillance requirement in a certain field of spaceflight, solve problems in the process of image transmission with high bit error rate, low transmission link reliability, a real--time image compression and transmission system based on HDLC protocol is proposed. Based on the proposed system framework, the image compression algorithm, stream control and ring buffer algorithm are studied and analyzed. The paper introduces the design and software implementation of the real-- time image compression transmission technology. To ensure the real--time image compression and correctness, two kinds of video monitoring mode design using multi--thread technology, adopt the encoder structure optimization and compression algorithm optimization approach, has realized the multi--channel video single path switching and multiplex parallel video monitoring technology in the two modes. The system ensures the steady transmission of the bit stream and is transmitted to the center controller in accordance with the HDLC protocol, which has been running continuously for 5 hours without image missing frame, and can accurately express the dramatic changes in the movement. The system is reliable in performance and has achieved good results in applications.

关 键 词：实时压缩 H.264 HDLC协议 多路并行 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]