【摘要】 桥墩墩面锚栓孔是连接桥墩和桥梁的关键部件，精确定位锚栓孔是基于正射影像完成桥墩复测新技术的关键步骤。针对实际桥墩墩面锚栓孔多有杂物遮挡、经常有积水以及光照阴影等因素影响。导致现有的锚栓孔提取算法精度不足的问题，提出基于双重加权策略的桥墩墩面锚栓孔精确提取算法。首先，利用HOUGH变换对锚栓孔进行粗定位，剔除部分杂物轮廓的干扰；再结合灰度信息，排除部分杂物及积水对锚栓孔轮廓的影响，保证锚栓孔边缘轮廓的准确性；最后，在锚栓孔轮廓拟合阶段引入灰度梯度权重解决锚栓孔轮廓不清晰问题，保证锚栓孔拟合的精确性。结果表明：该算法提取的锚栓孔坐标精度在各个评价指标中均优于IRLS算法。因此，该算法能够在保证高精准性提取锚栓孔的同时，对多种复杂背景情况具有良好的适用性。更多还原

【Abstract】 Anchor bolt holes on the pier top are key components connecting piers and bridges, and their precise positioning is a crucial step in the new pier re-survey technology based on orthophotos. To address the problem leading to insufficient accuracy of existing anchor bolt hole extraction algorithms under practical conditions such as debris obstruction, frequent water accumulation,and lighting shadows on the pier top, an accurate extraction algorithm for anchor bolt holes on the pier top based on a dual weighting strategy is proposed. Firstly, HOUGH transform is used for the rough positioning of anchor bolt holes to eliminate the interference of some debris contours. Then, grayscale information is integrated to exclude the impact of partial debris and accumulated water on the contours of anchor bolt holes so as to ensure the accuracy of the edge contours of anchor bolt holes. Finally, grayscale gradient weights are introduced in the contour fitting stage of anchor bolt holes to solve the problem of unclear contours and guarantee the precision of anchor bolt hole fitting. The results show that the coordinate accuracy of anchor bolt holes extracted by this algorithm is superior to that of the IRLS algorithm in all evaluation indicators. Therefore, the proposed algorithm can not only extract anchor bolt holes with high precision but also has good adaptability to various complex background conditions.更多还原