Watermarking-based Error Concealment in Video Communications

다국어 초록 (Multilingual Abstract)

In this paper, an informed watermarking algorithm is proposed 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 in order 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 ㏈ in PSNR over non-informed WEC and that even a non-informed WEC is still superior to conventional error concealment techniques.

목차 (Table of Contents)

• ABSTRACT
• Ⅰ. Introduction
• Ⅱ. Previous Works
• Ⅲ. Watermark-based Error Concealment
• Ⅳ. Informed Watermarking Algorithm
• Ⅴ. Experimental Results by Simulations
• Ⅵ. Conclusions
• References
• 저자소개