中文摘要：

本文研究数字近景图像上标志点的精确定位问题,具体围绕两张桥梁悬索模型数字近景图像进行人工标志点的定位研究。在比较现有标志点定位方法特点的基础上,提出了一种新的近景标志点定位的方法。针对所研究的图像,比较各方法特点并进行单个标志点实验,得出各方法的优缺点。利用可行的两种方法对两张近景影像上的所有标志点定位,通过直接线性变换解算像片参数和检验点坐标,根据两种定位方法以及目视定位的解算结果,比较各方法的精度,得出结论———本文所提出的定位方法精度较高,采用该方法进行标志点定位,可提高像片解算的精度。

英文摘要：

This article studies high-accuracy positioning of the marking signs in the digital close-range images. Research is carried out on the artificial marking signs in two images of the bridge cable models. Based on the comparison of the existed methods, a new one to position these signs is proposed. The experiment is carried out using single marking sign and all methods, then compare them to know their characters. After that, position all the signs in the images with three feasible methods. Use the method of direct linear transformation （DLT） to calculate the camera parameters and coordinates of the marking signs. Compare various methods by the obtained result of precision. Then the conclusion is drauwn that the precision of method this article proposed is much higher than others. So the precision of the result of the images can be enhanced after using proposed in this article method.