An error concealment algorithm for wavelet-coded images over packet-switched networks
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In recent years, wavelet transforms have been successfully applied to image and video compression. In a distributed, multimedia computing environment, compressed video and image files need to be transmitted to users for real-time replay. Because the network is subject to packet losses, the image packetization scheme should take packet losses into account in their design. In this paper, we present an error concealment algorithm for wavelet-based compressed images over packet-switched networks. Two different packetization schemes, called the intrablock-oriented and interblock-oriented schemes, in conjunction with wavelet coding, are presented. In our approach, adjacent wavelet coefficients are scattered into different packets, so that any packet contains encoded wavelet coefficients at different resolution layers. When a packet is lost due to network congestion or transmission errors, a lost wavelet coefficient is estimated by the receiver through a linear interpolation of its adjacent ones. Our approach is evaluated under two different packet loss models with various packet loss probabilities through simulations driven by actual video sequences. 2004 Copyright SPIE - The International Society for Optical Engineering.