Image magnification based on a blockwise adaptive Markov random field model

Xiaoling Zhang, Kin Man Lam, Lansun Shen

Research output: Journal article publicationJournal articleAcademic researchpeer-review

15 Citations (Scopus)

Abstract

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.
Original languageEnglish
Pages (from-to)1277-1284
Number of pages8
JournalImage and Vision Computing
Volume26
Issue number9
DOIs
Publication statusPublished - 1 Sep 2008

Keywords

  • Image magnification
  • Iterated function systems
  • MAP estimation
  • Markov random field

ASJC Scopus subject areas

  • Signal Processing
  • Computer Vision and Pattern Recognition

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