Texture and edge preserving multiframe super-resolution


Turgay E., AKAR G.

IET IMAGE PROCESSING, cilt.8, ss.499-508, 2014 (SCI İndekslerine Giren Dergi)

  • Cilt numarası: 8 Konu: 9
  • Basım Tarihi: 2014
  • Doi Numarası: 10.1049/iet-ipr.2013.0342
  • Dergi Adı: IET IMAGE PROCESSING
  • Sayfa Sayısı: ss.499-508

Özet

Super-resolution (SR) image reconstruction refers to methods where a higher resolution image is reconstructed using a set of overlapping aliased low-resolution observations of the same scene. Although edge preservation has been a widely explored topic in SR literature, texture-specific regularisation has recently gained interest. In this study, texture-specific regularisation is handled as a post-processing step. A two stage method is proposed, comprising multiple SR reconstructions with different regularisation parameters followed by a restoration step for preserving edges and textures. In the first stage, two maximum-aposteriori estimators with two different amounts of regularisation are employed. In the second stage, pixel-to-pixel difference between these two estimates is post-processed to restore edges and textures. Frequency selective characteristics of discrete cosine transform and Gabor filters are utilised in the post-processing step. Experiments on synthetically generated images and real experiments demonstrate that the proposed methods give better results compared with the state-of-the-art SR methods especially on textures and edges.