Phase-only transform based shaping for error concealment coding

ABSTRACT

In this paper, we propose a novel approach of error resilient coding by introducing a phase-only transform to the low bit MDVQ (Multiple description vector quantization) method. Phase-only transform has the characteristic of shape preserving. Thus the original image could be synthesized using the true phases and the coarser descriptions. When both descriptions are received, a high quality reconstruction can be obtained. On the contrary, if only one description is available, a lower quality image would still be decoded from a received description. Even if an image suffers damages from an eraser channel, a signal with acceptable quality could be rebuilt with our scheme at least. Simulation results show that the proposed method outperforms several other approaches such as pixel interleaving, MDVQ and phase scrambling in PSNR.

REFERENCES

• 1: Chung D., and Wang Y., "Multiple description image coding using signal decomposition and reconstruction based on lapped orthogonal transforms," IEEE Trans. Circuits and Systems for Video Technology, 9(6), 1999, 895--908.
• 2: Gotz N. and Leelaporenchai P., "Optimatization of the Index Assignment for Multiple Description Vector Quantizers," IEEE Trans. Commun. 51(3), 2003, 336--340.
• 3: Olmo G. and Tillo T., "Directional multiple description scheme for still images," IEEE ICECS, 2, 2003, 886--889.
• 4: Sadri K. F. and Shirani S., "Multiple description coding of images using phase scrambling," IEEE ICASSP 3(3), 2004, 41--44.
• 5: Multiple Description Image Coding Using Pre- And Post-Processing, Proceedings of the International Conference on Information Technology: Coding and Computing, p.35, April 02-04, 2001
• 6: Vaishampayan V. A., "Design of multiple description scalar quantizers," IEEE Trans. Info. Theory, 39(3), 1993, 821--834.
• 7: Wang L, Swam, M. N. S. and Ahmad M. O., "Multiple description image coding using pixel interleaving and wavelet transform," Circuits and Systems, MWSCAS-2002, 2, 2002, II-235 -- II-238.
• 8: Wang Y., Orchard O. T., Vaishampayan V. A., and Reibman A. R. "Multiple description coding using pairwise correlatin g transforms," IEEE Trans. Image Processing, 10(3), 2001, 351--366.

INDEX TERMS

Keywords:
multiple description vector quantization, phase-only transform, reshaping