Gibbs artifact reduction for POCS super-resolution image reconstruction

Abstract

The topic of super-resolution image reconstruction has recently received considerable attention among the research community. Super-resolution image reconstruction methods attempt to create a single high-resolution image from a number of low-resolution images (or a video sequence). The method of projections onto convex sets (POCS) for super-resolution image reconstruction attracts many researchers’ attention. In this paper, we propose an improvement to reduce the amount of Gibbs artifacts presenting on the edges of the high-resolution image reconstructed by the POCS method. The proposed method weights the blur PSF centered at an edge pixel with an exponential function, and consequently decreases the coefficients of the PSF in the direction orthogonal to the edge. Experiment results show that the modification reduces effectively the visibility of Gibbs artifacts on edges and improves obviously the quality of the reconstructed high-resolution image.

References

1. Stark H Oskoui P High resolution image recoveryfrom image-plane arrays, using convex projectionsJournal of the Optical Society of America. A 1989 617151726
2. Patti A J Sezan M I Tekalp A M Superresolution video reconstruction with arbitrary samplinglattices and nonzero aperture timeIEEETransactions on Image Processing 1997 6(8)10641076
3. Eren P E Sezan M I Tekalp A M Robust, object-based high-resolution image reconstructionfrom low-resolution videoIEEE Transactionson Image Processing 1997 6(10)14461451
4. Patti A J Altunbasak Y Artifact reduction for settheoretic super resolution image reconstruction with edge adaptiveconstraints and higher-order interpolantsIEEE Transactions on Image Processing 2001 10(1)179186
5. Gevrekci M Gunturk B K Altunbasak Y POCS-based restoration of Bayer-sampled image sequencesProceedings of IEEE International Conference on Acoustics,Speech, and Signal Processing, Piscataway, NJ, USA, IEEE 2007 1I-753I-756
6. Yu J Xiao C Su K A method of Gibbs artifact reduction for POCS super-resolutionimage reconstructionProceedings of 8thInternational Conference on Signal Processing, ICSP 2006, IEEE, Piscataway,NJ, USA, IEEE 2006 21620
7. Schultz R R Stevenson R L Extraction of high-resolutionframes from video sequencesIEEE Transactionson Image Processing 1996 5(6)9961011