基于LPC2378的远程视频监控系统及图像优化算法  

Visual remote monitoring system and image optimization arithmetic based on LPC2378

作　　者：付茂勇[1] 吕玉祥[1] 陆斌[1] 于荣荣[1] 

机构地区：[1]太原理工大学物理电子系,山西太原030024

出　　处：《电力自动化设备》2009年第5期94-98,共5页Electric Power Automation Equipment

摘　　要：对利用ARM芯片LPC2378实现的用于输电线路的低功耗远程实时视频监控系统进行了研究。该系统硬件以内核为ARM7DMI的32位微处理器LPC2378芯片为核心,包括电源、视频采集/编码、气象传感器及无线通信等部分。系统监控中心通过访问无线网络以控制下位机对现场视频及气象数据进行采集后,对数据进行相应的处理。提出了对ARM7处理器的程序优化方法,并在一种新的JPEG图像压缩算法的基础上提出了针对ARM7硬件结构的离散余弦(DCT)为基础的有损压缩算法,输出码符合JFIF规范,生成jpg格式文件。论述了软件优化设计:C库优化、视频编码优化等关键技术。经过理论分析和系统实时测试表明,系统设备运行稳定、速度快、功耗低,性能良好。A low power-consumption and real-time visual remote monitoring system is developed based on LPC2378 for transmission lines. The system hardware takes the 32-bit microprocessor LPC2378, based on ARMTDMI, as its core, together with other parts for power supply, video signal collection ＆ coding, weather data acquisition and wireless transmission. The supervision center controls site terminals to collect the video signals and weather data via wireless network and then processes them. A procedure optimization method is presented for ARM7 and a lossy compression arithmetic based on fast DCT（Discrete Cosine Transform） is put forward according to its HW structure. The output codes match JFIF norm, which can be translated into documents with jpg format. Some key technologies are discussed： the C-database optimization and video signal coding optimization. Analysis and real-time test show that, the system operates stably with high speed, low power consumDtion and good performance.

关 键 词：监控系统 优化算法 LPC2378 图像 实时视频 

分 类 号：TM734[电气工程—电力系统及自动化]