Circulant dissimilarity-based shape registration for object segmentation |
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Authors: | Xunxun Zeng Meiqing Wang Choi-Hong Lai |
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Affiliation: | 1. College of Mathematics and Computer Science, Fuzhou University, Fuzhou, China;2. Department of Mathematical Sciences, University of Greenwich, London, UK |
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Abstract: | ABSTRACTA shape prior-based object segmentation is developed in this paper by using a shape transformation distance to constrain object contour evolution. In the proposed algorithm, the transformation distance measures the dissimilarity between two unaligned shapes by cyclic shift, which is called ‘circulant dissimilarity’. This dissimilarity with respect to transformation of the object shape is represented by circular convolution, which could be efficiently computed by using fast Fourier transform. Given a set of training shapes, the kernel density estimation is adopted to model shape prior. By integrating low-level image feature, high-level shape prior and transformation distance, a variational segmentation model is proposed to solve the transformation invariance of shape prior. Numerical experiments demonstrate that circulant dissimilarity-based shape registration outperforms the iterative optimization on explicit pose parameters, and show promising results and highlight the potential of the method for object registration and segmentation. |
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Keywords: | Segmentation circulant dissimilarity shape prior kernel density estimation level set |
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