Error concealment in video communications by informed watermarking

Authors:
Chowdary Adsumilli;Sanjit Mitra;Taesuk Oh;Yong Cheol Kim
Affiliations:
Citrix Co;Dept. of ECE, University of California, Santa Barbara;Dept. of ECE, University of Seoul, Korea;Dept. of ECE, University of Seoul, Korea
Venue:
PSIVT'06 Proceedings of the First Pacific Rim conference on Advances in Image and Video Technology
Year:
2006

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Abstract

We propose an informed watermarking algorithm that aids in concealing packet loss errors in video communications. This watermark-based error concealment (WEC) method embeds a low resolution version of the video frame inside itself as watermark data. At the receiver, the extracted watermark is used as a reference for error concealment. The proposed DCT-based algorithm employs informed watermarking techniques to minimize the distortion of host frames. At the encoder, a predictive feedback loop is employed which helps to adjust the strength of the data embedding. Furthermore, the distortion of the DCT coefficients introduced in the embedding can be removed to a considerable extent, by employing bit-sign adaptivity. Simulation results on standard video sequences show that the proposed informed WEC scheme has an advantage of 3~4 dB in PSNR over non-informed WEC.