压力曲线上的负压波是管道泄漏的征兆。为快速检测和准确定位压力曲线上的负压波,提出了一种基于图像处理的方法。该方法将压力数值转化为图像灰度值,将压力曲线上的负压波起始点定位等价为图像处理中的边缘检测。利用灰度统计直方图计算一段压力曲线前半段的主流数值,如果压力曲线的后半段偏离主流数值,则表明检测到负压波。对此压力曲线进行灰度拉伸变换,使负压波更为凸显。试验研究表明,该方法可减少系统的误报和漏报,提高定位的精度。 Negative pressure wave on the pressure curve is a sign of pipeline leaks. In order to quickly detect and accurately locate the negative pressure wave on the pressure curve, a method based on image processing is proposed. The method converts the pressure value into the image gray value, and the starting point of the negative pressure wave on the pressure curve is equivalent to the edge detection in the image processing. The grayscale histogram is used to calculate the mainstream value of the first half of the pressure curve. If the latter half of the pressure curve deviates from the mainstream value, negative pressure waves are detected. The pressure curve of gray-scale tensile transformation, the negative pressure wave is more prominent. Experimental results show that this method can reduce the system false positives and false positives and improve the accuracy of positioning.