A comparison of local and global scale approaches in characterizing shapes

A comparison of local and global scale approaches in characterizing shapes
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局部和全局尺度特征形状方法的比较

DOI:
10.1117/12.812449
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发表时间:
2009
期刊:
--
影响因子:
--
通讯作者:
Rueda S
Rueda S
中科院分区:
--
文献类型:
--
作者:
Rueda S

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尺度是计算机视觉和模式识别中的一个基本概念,特别是在形状分析、图像分割和配准等领域。它代表了场景中对象信息的详细程度。图像处理中的全局尺度方法以各种固定尺度中的每一个来处理场景,并将结果联合收割机组合,如在尺度空间方法中那样。局部尺度方法定义了每个点上最大的均匀区域,并将其视为基本单元。描述形状也存在类似的二分法。为了根据应用改变细节水平,期望能够在不同尺度下检测形状边界上的主导点。在本文中,我们比较了形状分析的全局和局部尺度方法。对于全局缩放,选择曲率缩放空间(Curvature Scale Space,CSS)方法,其是最先进的形状描述符,并且在MPEG-7标准中使用。局部尺度方法是基于曲率尺度(c-scale)的概念,这是一个新的局部尺度概念,它将为图像开发的局部形态尺度(如球,张量和广义尺度)的概念带到了边界领域。所有先前的提取优势点的方法都缺乏这种局部尺度的概念。在本文中,我们提出了一个全面的评估,这些全球和局部规模的方法。我们的分析表明,局部自适应尺度的形状描述优于全球规模,正如它也被证明在图像滤波,分割和配准。
Scale is a fundamental concept in computer vision and pattern recognition, especially in the fields of shape analysis, image segmentation, and registration. It represents the level of detail of object information in scenes. Global scale methods in image processing process the scene at each of various fixed scales and combine the results, as in scale space approaches. Local scale approaches define the largest homogeneous region at each point, and treat these as fundamental units. A similar dichotomy exists for describing shapes also. To vary the level of detail depending on application, it is desirable to be able to detect dominant points on shape boundaries at different scales. In this paper, we compare global and local scale approaches to shape analysis. For global scale, the Curvature Scale Space (CSS) method is selected, which is a state of the art shape descriptor, and is used in the MPEG-7 standard. The local scale approach is based on the notion of curvature-scale (c-scale), which is a new local scale concept that brings the idea of local morphometric scale (such as ball-, tensor-, and generalized scale) developed for images to the realm of boundaries. All previous methods of extracting dominant points lack this concept of a local scale. In this paper, we present a thorough evaluation of these global and local scale methods. Our analysis indicates that locally adaptive scale has advantages over global scale in shape description, just as it has also been demonstrated in image filtering, segmentation, and registration.
局部曲率尺度:形状描述的新概念
DOI: 10.1117/12.770444
发表时间: 2008
期刊: --
影响因子: --
作者:
Rueda S
通讯作者: Rueda S
DOI: --
发表时间: 2002
影响因子: 8
作者:
Richard Neumann;G. Teisseron
通讯作者: G. Teisseron
二维曲率估计器的比较研究
DOI: --
发表时间: 2007
期刊: International Conference on Computing: Theory and Applications
影响因子: --
作者:
S. Hermann;R. Klette
通讯作者: R. Klette