Line laser assisted visual monitoring for opening of water plug-in gate valve in coal preparation plant
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摘要: 针对选煤厂水泵闸板阀开度需人工调节而无法实现集中控制的问题，提出了一种选煤厂水泵闸板阀开度线激光辅助视觉监控方法。采用线激光作为辅助检测手段来增加目标检测特征、避免光线变化对目标检测的影响，并利用视频监控系统采集闸板阀图像；采用模板匹配法对图像中目标进行定位，利用自适应阈值法检测出投射到闸板上的线激光，再经过腐蚀、膨胀等形态学操作使闸板上的线激光相邻断开区域连接，同时采用高斯滤波方法去除图像噪声，得到图像中线激光位置及长度，从而检测出闸板阀开度；PLC集中控制系统通过对比闸板阀开度检测值与设定值，实现闸板阀开度的闭环控制。实验结果表明，该方法在不同背景亮度条件下，均可准确定位闸板阀，提高了闸板阀开度检测准确性。Abstract: Aiming at problem that opening of water plug-in gate valve in coal preparation plant needs manual adjustment and cannot achieve centralized control, a line laser assisted visual monitoring method for opening of water plug-in gate valve in coal preparation plant was proposed. Line laser is used as an auxiliary detection means to increase target detection characteristics and avoid influence of light changes on target detection, and video monitoring system is used to collect plug-in gate valve image. Template matching method is used to locate target in the image, adaptive threshold method is used to detect line laser projected on the gate, and then adjacent disconnected areas of the line laser on the gate are connected through morphological operations such as corrosion, expansion and so on. Meanwhile, Gaussian filtering method is adopted to remove image noise, so position and length of the line laser in the image are obtained to detect opening of plug-in gate valve. PLC centralized control system realizes closed-loop control of opening of plug-in gate valve by comparing the detected opening value and the set one. The experimental results show that the method can accurately locate plug-in gate valve under different background brightness conditions, and improve detection accuracy of opening of plug-in gate valve.
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期刊类型引用(3)
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百度学术
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