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Conjugate gradient method preconditioned with modified block SSOR iteration for multiplicative half-quadratic image restoration

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Abstract

Image restoration problem is often solved by minimizing a cost function which consists of data-fidelity terms and regularization terms. Half-quadratic regularization has the advantage that it can preserve image details well in the recovered images. In this paper, we consider solving the image restoration model which involves multiplicative half-quadratic regularization term. Newton method is employed to solve the nonlinear system of equations resulted from the optimization problem for image restoration. At each Newton iteration step, a linear system of equations with symmetric positive definite coefficient matrix arises. The preconditioned conjugate gradient method with the proposed modified block SSOR (symmetric successive over-relaxation) preconditioner is applied to solve this linear system of equations. The condition number of the preconditioned matrix is estimated and numerical experiments are also implemented for image restoration. Both theoretical and numerical results show that the modified block SSOR preconditioned PCG methods can greatly improve the computation efficiency when solving the multiplicative half-quadratic regularized image restoration problem.

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Acknowledgements

This work is supported by the National Natural Science Foundation of China Nos. 11971215 and 11971214, the Key Laboratory of Applied Mathematics and Complex Systems of Lanzhou University, MOE-LCSM, School of Mathematics and Statistics, Hunan Normal University, Changsha, Hunan 410081, P. R. China.

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  1. School of Mathematics and Statistics, Lanzhou University, Lanzhou, 730000, Gansu, China

    Pei-Pei Zhao & Yu-Mei Huang

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  1. Pei-Pei Zhao
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  2. Yu-Mei Huang
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Zhao, PP., Huang, YM. Conjugate gradient method preconditioned with modified block SSOR iteration for multiplicative half-quadratic image restoration. Calcolo 57, 31 (2020). https://doi.org/10.1007/s10092-020-00379-1

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