摘要
为了真正实现变电站的无人值班、无人值守,在传统的远动系统“四遥”功能——遥测、遥信、遥控和遥调的基础上增加了遥视功能。目前已有的遥视监视设备主要是通过对监视设备采集到的图像进行压缩编码传输,以实现对现场的监视,传输数据大、速度慢。文章运用能量的观点,对图像是否变化进行识别,仅对变化的图像进行传输,大大提高了图像传输的效率。为提高信道传输效率,应用二维小波变换对所需传输的图像进行信号压缩;为方便调度端监视,提高值班人员的监视效率,根据力学中重心的定义,对图像的变化部分中心进行了标注。实验结果证明此方法可以快速传输更多的图像,增加了通信的能力,有利于对无人值班变电站实时监视。
This paper applies the energy viewpoint to distinguish the images variation. It only transmits images that are changed, which increase the efficiency of the image transmission. To increase the transmission efficiency of the channel, the authors use two-dimensional wavelet transform to compress the images. To make dispatching terminals convenient to monitor the substations, and to increase the operator' s monitoring efficiency, the centre of the changed part of the images is marked based on the definition of barycentre in mechanics. The results show that this method can transmit more images fleetly, which raises the transmission capacity and it is propitious to monitor the unattended substations on line.
出处
《电力科学与工程》
2005年第2期34-37,共4页
Electric Power Science and Engineering
关键词
遥视技术
小波变换
能量函数
二维MRA
图像识别
remote monitoring technique
wavelet transform
energy function
two-dimensional MRA
image identification
