首页> 外文期刊>Pattern Analysis and Applications >A new radial symmetry measure applied to photogrammetry
【24h】

A new radial symmetry measure applied to photogrammetry

机译:一种适用于摄影测量的新型径向对称测量

获取原文
获取原文并翻译 | 示例

摘要

This work presents a new measure for radial symmetry and an algorithm for its computation. This measure identifies radially symmetric blobs as locations with contributions from all orientations at some scale. Hence, at a given scale, radial symmetry is computed as the product of the responses of a set of even symmetric feature detectors, with different orientations. This operator presents low sensitivity to shapes lacking radial symmetry, is robust to noise, contrast changes and strong perspective distortions, and shows a narrow point spread function. A multi-resolution measure is provided, computed as the maximum of the symmetry measure evaluated over a set of scales. We have applied this measure in the field of photogrammetry for the detection of circular coded fiducial targets. The detection of local maxima of multi-resolution radial symmetry is combined with a step of false-positive rejection, based on elliptical model fitting. In our experiments, the efficiency of target detection with this method is improved regarding a well-known commercial system, which is expected to improve the performance of bundle adjustment techniques. In order to fulfill all steps previous to bundle adjustment, we have also developed our own method for recognition of coded targets. This is accomplished by a standard procedure of segmentation and decoding of the ring sequence. Nevertheless, we have included a step for the verification of false positives of decoding based on correlation with reference targets. As far as we know, this approach cannot be found in literature.
机译:这项工作提出了一种新的径向对称测量方法及其算法。该度量将径向对称的斑点标识为具有所有比例的所有方向的贡献的位置。因此,在给定的比例下,将径向对称性计算为一组具有不同方向的均匀对称特征检测器的响应的乘积。该运算符对缺乏径向对称性的形状具有较低的灵敏度,对噪声,对比度变化和强烈的透视失真具有鲁棒性,并且显示出窄点扩展功能。提供了一种多分辨率度量,该度量被计算为在一组刻度上评估的对称度量的最大值。我们已经在摄影测量领域中应用了该措施,以检测圆形编码基准目标。基于椭圆模型拟合,将多分辨率径向对称的局部最大值的检测与假阳性拒绝步骤结合在一起。在我们的实验中,对于著名的商业系统,使用这种方法的目标检测效率得到了提高,有望改善束调整技术的性能。为了完成包调整之前的所有步骤,我们还开发了自己的识别编码目标的方法。这是通过环序列的分段和解码的标准过程来完成的。然而,我们已经包括了基于与参考目标的相关性来验证解码的误报的步骤。据我们所知,这种方法在文献中找不到。

著录项

  • 来源
    《Pattern Analysis and Applications》 |2013年第4期|637-646|共10页
  • 作者单位

    Centro de Investigación en Tecnoloxías da Información (CITIUS) Universidade de Santiago de Compostela">(1);

    Multimodal Information Area Galician Research and Development Center in Advanced Telecommunications (GRADIANT)">(2);

    Centro de Investigación en Tecnoloxías da Información (CITIUS) Universidade de Santiago de Compostela">(1);

    Centro de Investigación en Tecnoloxías da Información (CITIUS) Universidade de Santiago de Compostela">(1);

    Centro de Investigación en Tecnoloxías da Información (CITIUS) Universidade de Santiago de Compostela">(1);

    Centro de Investigación en Tecnoloxías da Información (CITIUS) Universidade de Santiago de Compostela">(1);

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Circular coded targets; Radial symmetry; Filter banks; Log Gabor; Target identification; Correlation;

    机译:循环编码目标;径向对称;过滤器组;对数Gabor;目标识别;相关性;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号