Image magnification based on a blockwise adaptive Markov random field model

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摘要

In this paper, an effective image magnification algorithm based on an adaptive Markov random field (MRF) model with a Bayesian framework is proposed. A low-resolution (LR) image is first magnified to form a high-resolution (HR) image using a fractal-based method, namely the multiple partitioned iterated function system (MPIFS). The quality of this magnified HR image is then improved by means of a blockwise adaptive MRF model using the Bayesian ‘maximum a posteriori’ (MAP) approach. We propose an efficient parameter estimation method for the MRF model such that the staircase artifact will be reduced in the HR image. Experimental results show that, when compared to the conventional MRF model, which uses a fixed set of parameters for a whole image, our algorithm can provide a magnified image with the well-preserved edges and texture, and can achieve a better PSNR and visual quality.

论文关键词:Image magnification,MAP estimation,Markov random field,Iterated function systems

论文评审过程:Received 31 May 2006, Revised 7 January 2008, Accepted 4 March 2008, Available online 25 March 2008.

论文官网地址:https://doi.org/10.1016/j.imavis.2008.03.003