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A novel variational model for image decomposition

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Abstract

Image decomposition denotes a process by which an image is decomposed into several different scales, such as cartoon, texture (or noise) and edge. In order to better separate the noise and preserve the edges, one coupled variational model for image decomposition is proposed in this paper. In this coupled model, an introduced vector field and the gradient of image are intertwined and the orders of this model can be adjusted by the given parameters. To prevent image from being too smooth and edges from being damaged, one weighted function containing a Gaussian convolution is proposed. Meanwhile, considering the equivalence between the solution of the heat diffusion equation and the Gaussian convolution, we turn the convolution computation into a variational model for the introduced vector field. Different from the existing methods, the proposed model firstly contains first- and second-order regularization terms which can remove the noise better; secondly, the solution for the introduced vector field is just given Gaussian convolution. To solve the variational system, the alternating direction method, primal–dual method and Gauss–Seidel iteration are adopted. In addition, the proximal point method is designed for solving the primal variable and dual variable. Extensive numerical experiments verify that the new method can obtain better results than those by some recent methods.

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Acknowledgements

This work is supported by the National Science Foundation of China (Nos. U1504603, 61301229, 61401383) and Key Scientific Research Project of Colleges and Universities in Henan Province (Nos. 18A120002, 19A110014).

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Correspondence to Jianlou Xu.

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Xu, J., Hao, Y., Li, M. et al. A novel variational model for image decomposition. SIViP 13, 967–974 (2019). https://doi.org/10.1007/s11760-019-01434-3

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