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水下地形的测量对研究河流运动与泥沙冲淤具有重要的实际意义。应用B超仪可以采集到水下地形的实时图像,该文据此提出了一种基于B超图像的水下地形边界提取与重建的方法。该方法利用地形的连续性以及B超图像中地形亮带灰度和梯度的变化特征,实现了图像中地形边界线的提取与重建,适应性较好。然后通过曲线拟合和样条插值,重新构建了水下三维地形。研究结果表明:重建后的三维地形与实际水下地形吻合较好,直观可视,再现了水下地形原貌。
The measurement of underwater topography has important practical significance for the study of river movement and siltation. A real-time image of the underwater terrain can be acquired by using B-mode instrument. This paper presents a method of underwater terrain boundary extraction and reconstruction based on B-mode image. The method utilizes the continuity of the terrain and the change characteristics of the grayscale and gradient of the terrain bright band in the B-mode image to achieve the extraction and reconstruction of the terrain boundary line in the image, which has good adaptability. Then through the curve fitting and spline interpolation, underwater 3D terrain was reconstructed. The results show that the reconstructed 3D terrain is in good agreement with the actual underwater terrain, and it can be visualized and visualized.