An edge-guided image interpolation algorithm via directional filtering and data fusion

Lei Zhang, Xiaolin Wu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

863 Citations (Scopus)


Preserving edge structures is a challenge to image interpolation algorithms that reconstruct a high-resolution image from a low-resolution counterpart. We propose a new edge-guided nonlinear interpolation technique through directional filtering and data fusion. For a pixel to be interpolated, two observation sets are defined in two orthogonal directions, and each set produces an estimate of the pixel value. These directional estimates, modeled as different noisy measurements of the missing pixel are fused by the linear minimum mean square-error estimation (LMMSE) technique into a more robust estimate, using the statistics of the two observation sets. We also present a simplified version of the LMMSE-based interpolation algorithm to reduce computational cost without sacrificing much the interpolation performance. Experiments show that the new interpolation techniques can preserve edge sharpness and reduce ringing artifacts.
Original languageEnglish
Pages (from-to)2226-2238
Number of pages13
JournalIEEE Transactions on Image Processing
Issue number8
Publication statusPublished - 1 Aug 2006


  • Data fusion
  • Edge preservation
  • Image interpolation
  • Linear minimum mean square-error estimation (LMMSE)

ASJC Scopus subject areas

  • Software
  • Medicine(all)
  • Computer Graphics and Computer-Aided Design


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