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Optimised cubic spline approximations of image contours using points suppression

机译:使用点抑制优化图像轮廓的三次样条近似

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In this study, the author presents an algorithm for approximating the contour of a digital planar image by cubic splines. In the authors’ method, a subset of points (called corners) from the contour is selected. These corners are used to segment the contour and each segment is then approximated by a cubic spline. Parameters of the fitted splines are estimated by optimisation methods. The novelty of the proposed approach lies in the way the corners are selected. An initial set of corners are first selected using a process which is called as iterative points-suppression. This initial set is further reduced by a novel technique termed spline-suppression. The result is a very compact cubic spline representation of the contour using few corners on the contour. The effectiveness of the proposed method is demonstrated on two large databases: MPEG7_CE-Shape-1_Part_B database and a database of handwritten characters.
机译:在这项研究中,作者提出了一种通过三次样条曲线逼近数字平面图像轮廓的算法。在作者的方法中,从轮廓中选择了一个点子集(称为角)。这些角用于分割轮廓,然后通过三次样条曲线近似每个分割。拟合样条曲线的参数通过优化方法进行估算。所提出的方法的新颖之处在于选择拐角的方式。首先使用称为迭代点抑制的过程选择一组初始角。通过称为样条抑制的新技术进一步减少了该初始集合。结果是使用轮廓上的几个角非常紧凑的三次样条曲线表示。在两个大型数据库上证明了该方法的有效性:MPEG7_CE-Shape-1_Part_B数据库和手写字符数据库。

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