Boundary detection by contextual non-linear smoothing

نویسندگان

  • Xiuwen Liu
  • DeLiang Wang
  • J. Raul Ramirez
چکیده

In this paper we present a two-step boundary detection algorithm. The "rst step is a nonlinear smoothing algorithm which is based on an orientation-sensitive probability measure. By incorporating geometrical constraints through the coupling structure, we obtain a robust nonlinear smoothing algorithm, where many nonlinear algorithms can be derived as special cases. Even when noise is substantial, the proposed smoothing algorithm can still preserve salient boundaries. Compared with anisotropic di!usion approaches, the proposed nonlinear algorithm not only performs better in preserving boundaries but also has a non-uniform stable state, whereby reliable results are available within a "xed number of iterations independent of images. The second step is simply a Sobel edge detection algorithm without non-maximum suppression and hysteresis tracking. Due to the proposed nonlinear smoothing, salient boundaries are extracted e!ectively. Experimental results using synthetic and real images are provided. ( 1999 Pattern Recognition Society. Published by Elsevier Science Ltd. All rights reserved.

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عنوان ژورنال:
  • Pattern Recognition

دوره 33  شماره 

صفحات  -

تاریخ انتشار 2000