Maximum a posteriori super-resolution of compressed video using a new multichannel image prior

  • Authors:

  • Stefanos P. Belekos;Nikolaos P. Galatsanos;S. Derin Babacan;Aggelos K. Katsaggelos

  • Affiliations:

  • University of Athens, Faculty of Physics, Athens, Greece and Northwestern University, Department of Electrical Engineering and Computer Science, Evanston, IL;University of Patras, Department of Electrical and Computer Engineering, Rio, Greece;Northwestern University, Department of Electrical Engineering and Computer Science, Evanston, IL;University of Athens, Faculty of Physics, Athens, Greece and Northwestern University, Department of Electrical Engineering and Computer Science, Evanston, IL

  • Venue:
  • ICIP'09 Proceedings of the 16th IEEE international conference on Image processing
  • Year:
  • 2009

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Abstract

Super-resolution (SR) algorithms for compressed video aim at recovering high-frequency information and estimating a high-resolution (HR) image or a set of HR images from a sequence of low-resolution (LR) video frames. In this paper we present a novel SR algorithm for compressed video based on the maximum a posteriori (MAP) framework. We utilize a new multichannel image prior model, along with the state-of-the art image prior and observation models. Moreover, relationship between model parameters and the decoded bitstream are established. Numerical experiments demonstrate the improved performance of the proposed method compared to existing algorithms for different compression ratios.