针对常规方法采用图像修补方式得到的侧扫声呐图像质量不高的问题, 提出三角剖分仿射变换的侧扫声呐图像拼接方法。该方法将条带图像剖分为一对三角形, 在保持其中一个三角形的坐标不变时, 调整另一个三角形与相邻条带图像贴合, 利用仿射变换实现坐标映射, 完成图像的无缝拼接。实验结果表明, 该方法能有效完成图像的无缝拼接, 具有良好的视觉效果; 在信息熵、信噪比和平均梯度等方面均优于常规的缝隙填补法, 具有较高的图像质量。

Aiming at the problem of poor quality of side-scan sonar image obtained by conventional image mending methods, this paper proposes a method of side-scan sonar image mosaic based on affine transformation method of triangulation. This method divides the strip image into a pair of triangles. While keeping the coordinates of one triangle unchanged, the other triangle is adjusted to fit with the adjacent strip image. Then affine transformation is used to realize the coordinate mapping for completing the seamless mosaic of the image. The experimental results show that:1) This method can effectively complete the seamless mosaic of images with a fine visual effect;and 2) It has higher image quality and better performance in terms of information entropy, signal to noise ratio and average gradient compared with gap filling method.