Adaptive image restoration using a proximity measure to boundary

Sang-Hoon Lee

doi:10.1117/12.806780

12 February 2009 Adaptive image restoration using a proximity measure to boundary

Sang-Hoon Lee

Author Affiliations +

Proceedings Volume 7245, Image Processing: Algorithms and Systems VII; 72450X (2009) https://doi.org/10.1117/12.806780
Event: IS&T/SPIE Electronic Imaging, 2009, San Jose, California, United States

Abstract

In this study, an iterative maximum a posteriori (MAP) approach using a Bayesian model of Markov random field (MRF) was proposed for image restoration to reduce or remove the noise resulted from imperfect sensing. Image process is assumed to combine the random fields associated with the observed intensity process and the image texture process respectively. The objective measure for determining the optimal restoration of this "double compound stochastic" image process is based on Bayes' theorem, and the MAP estimation employs the Point-Jacobian iteration to obtain the optimal solution. In the proposed algorithm, MRF is used to quantify the spatial interaction probabilistically, that is, to provide a type of prior information on the image texture and the neighbor window of any size is defined for contextual information on a local region. However, the window of a certain size would result in using wrong information for the estimation from adjacent regions with different characteristics at the pixels close to or on the boundary. To overcome this problem, the new method is designed to use less information from more distant neighbors as the pixel is closer to the boundary. It can reduce the possibility to involve the pixel values of adjacent region with different characteristics. The proximity to the boundary is estimated using a non-uniformity measurement based on edge value, standard deviation, entropy, and the 4th moment of intensity distribution. This study evaluated the new scheme using simulation data, and the experimental results show a considerable improvement in image restoration.

Citation Download Citation

Sang-Hoon Lee "Adaptive image restoration using a proximity measure to boundary", Proc. SPIE 7245, Image Processing: Algorithms and Systems VII, 72450X (12 February 2009); https://doi.org/10.1117/12.806780

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KEYWORDS

Image processing

Image restoration

Lithium

Magnetorheological finishing

Stochastic processes

Monte Carlo methods

Synthetic aperture radar

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