本文以宁波甬江常洪越江沉管隧道某管段基槽的水下测量为实例,介绍了利用Seaprice高分辨率扇面扫描声纳影像进行水下测量的方法。以一周期扫描扇面的声纳影像为原始观测数据,首先采用改进的Hough变换方法检测距离标签圆环并用曲线拟合法提高参数的估计精度,然后利用加权邻域共生矩阵方法逐扇面判断最优回声区域,得到扫描断面图,最后根据断面数据和传感器的坐标得到水下地形点的三维坐标,并采用基于Delaunay三角形的三次样条插值方法组成水下地形的规则格网模型并用着色表面可视化。 In this paper, taking the underwater measurement of the basement of a pipe in the Yonghong River in Ningbo Yongjiang River as an example, the underwater scanning method using the Seaprice high-resolution scanning sonar image is introduced. Firstly, a sonar image of a sector is scanned for a period of time as the original observation data. Firstly, a modified Hough transform is used to detect the distance label ring and the curve fitting method is used to improve the estimation accuracy of the parameters. Then, the weighted neighborhood co-occurrence matrix method is used to judge the optimal echo Finally, the 3D coordinates of the underwater topographic points are obtained based on the cross-sectional data and the sensor coordinates. The regular mesh model of the underwater topography is formed by using the cubic spline interpolation method based on the Delaunay triangles, and the surface is visualized with the colored surface.