A real-time hydrological monitoring system was designed using the combination method of the ARM processor and video server,which can realize the extraction of the characteristic values in the lower computer and the following communication with the upper computer through the GRPS.The system used the Wince programming to obtain the binarization of the collected image.The morphological algorithm was employed to remove the noncharacteristic values and the edge of the image was also refined.The Hough transform w...