测绘通报 ›› 2024, Vol. 0 ›› Issue (10): 120-124,173.doi: 10.13474/j.cnki.11-2246.2024.1020.

• 学术研究 • 上一篇    

网络球型摄像机瞬时视场的单点校正水位连续测量方法

刘科利1, 赵雪莹2, 辛成章3, 刘昌军4, 姚吉利1   

  1. 1. 山东理工大学建筑工程与空间信息学院, 山东 淄博 255049;
    2. 山东省国土测绘院, 山东 济南 255000;
    3. 甘肃省地质矿产勘查开发局测绘勘查院, 甘肃 兰州 730000;
    4. 中国水利水电科学研究院, 北京 100000
  • 收稿日期:2024-01-25 发布日期:2024-11-02
  • 作者简介:刘科利(1973—),男,高级实验师,主要从事测量数据处理工作。E-mail:liukeli@sdut.edu.cn
  • 基金资助:
    国家重点研发计划(2023YFC3006700);“四预”防洪灾害技术与实践

A continuous water level measurement method based on single-point correction in instantaneous field-of-view of network dome camera

LIU Keli1, ZHAO Xueying2, XIN Chengzhang3, LIU Changjun4, YAO Jili1   

  1. 1. School of Civil Engineering and Geomatics, Shandong University of Technology, Zibo 255049, China;
    2. Shandong Provincial Institude of Land Surveying and Mapping, Jinan 255000, China;
    3. Gansu Provincial Bureau of Geology and Mineral Explorations Development, Lanzhou 730000, China;
    4. China Institute of Water Resources and Hydropower Research, Beijing 100000, China
  • Received:2024-01-25 Published:2024-11-02

摘要: 基于网络球型摄像机进行洪水监测成为当今水利建设的热点之一,摄像机需进行旋转、焦距的放大与缩小等操作,才能在多视场进行流速、水位、流量一体化监测。由于摄像机传动装置制造的缺陷,在多视场切换时会出现预置点不能准确复位的问题而产生隙动差,这给从单张影像上解析水位、流速造成较大偏差,因此本文提出一种针对水位测量的隙动差校正方法。首先对预置点的水位尺进行精确标定,得到预置点水位方程参数,并在影像上选取两个特征明显的校正点;然后在连续监测中,将瞬时视场内校正点影像坐标按线性方法校正到预置点视场校正点;最后用预置点水位方程参数计算瞬时视场水位。经现场试验测试,不同瞬时视场校正点的影像坐标最大有8像素隙动差,产生水位误差达5cm,而经本文方法计算的水位误差约为5mm,说明本文方法对消减隙动差的影响是显著的。

关键词: 洪水监测, 隙动差, 线性校正, 水位方程, 水位精度

Abstract: Flood monitoring based on network dome camera has become one of the hot spots in water conservancy construction. In order to monitor the flow rate, water level and flow rate in multi-field-of-view, the camera needs to rotate, zoom in and out the focal length. Because of the defects of the camera transmission, the preset point can't be reset accurately when the multi-field-of-view is switched, resulting in the gap error. It creates a large deviation in analyzing water level and flow rate from single image. In this paper, a method of gap error correction for water level measurement is proposed. Firstly, the water level ruler of the preset point is precisely calibrated, and the parameters of the water level equation are obtained. And two correction points with obvious features are selected on the image. Then, The image coordinates of the correction points in the instantaneous field-of-view are linear corrected to the preset field-of-view. Finally, water level in the instantaneous field-of-view is calculated by using the water level equation of the preset point. Through field test, the maximum gap error in different instantaneous field-of-view is 8 pix, and the water level error is 5cm. But the water level error is about 5mm by paper's method. It is shown that the paper's method can greatly reduce gap error in water level measurement.

Key words: flood monitoring, gap error, linear correction, water level equation, water level accuracy

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