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Shape matching using a modified Generalized Hough Transform.

机译:使用改进的广义霍夫变换进行形状匹配。

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摘要

Most of the work related to shape matching in digital photogrammetry utilizes parametrized shapes, where shapes are approximated by analytical functions or polygons. In this work a general matching algorithm is presented based on the principles of Generalized Hough Transform (GHT). It utilizes non-parametrized shapes and does not require a polygonal approximation nor does it depend on curve critical points or breakpoints, which may fail to exist due to noise and occlusions. An approach is also presented for modifying the GHT in order to overcome the shortcoming of its not being rotation invariant. In the matching algorithm, edge segments are extracted from the overlapping images using Canny's edge detector and an edge tracking algorithm. The matching technique is applied for each edge segment in one image and its matching candidates in the other image. A consistency check for the matching results is performed utilizing relationships among edge segments in both images. Tests showed the efficiency of the matching approach in dealing with broken and occluded edge segments and in achieving good and robust results.
机译:与数字摄影测量中的形状匹配有关的大多数工作都使用参数化形状,其中形状通过解析函数或多边形进行近似。在这项工作中,提出了一种基于广义霍夫变换(GHT)原理的通用匹配算法。它利用非参数化形状,不需要多边形逼近,也不依赖于曲线的临界点或断点,这些临界点或断点可能由于噪声和遮挡而无法存在。还提出了一种用于修改GHT以克服其不是旋转不变的缺点的方法。在匹配算法中,使用Canny边缘检测器和边缘跟踪算法从重叠图像中提取边缘段。将匹配技术应用于一个图像中的每个边缘段,并将其应用于另一图像中的匹配候选对象。利用两个图像中边缘段之间的关系来执行匹配结果的一致性检查。测试表明,该匹配方法可有效处理折断和闭合的边缘段,并获得良好而稳定的结果。

著录项

  • 作者

    Zahran, Mohamed Ibrahim.;

  • 作者单位

    The Ohio State University.;

  • 授予单位 The Ohio State University.;
  • 学科 Engineering Civil.
  • 学位 Ph.D.
  • 年度 1997
  • 页码 112 p.
  • 总页数 112
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 建筑科学;
  • 关键词

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