Reconstruction of JPEG Coded Images in Lossy Packet Networks

In this paper packetization and reconstruction algorithms in transmission of JPEG coded images over lossy channels are proposed. An interleaving method is devised that maximizes the minimumdistance between the 8 8 blocks, used in JPEG, that are in the same packet. Then a method for estimating the missing DC coe cients of a JPEG coded image which is required for decoding the compressed image, is suggested and evaluated. As e ects of errors in estimating the missing DC value will appear as stripes across the image, a postprocessing technique for removing such stripes is also developed. Finally the missing data is reconstructed by exploiting the correlation between adjacent blocks. A novel reconstruction technique which has a good performance in reconstruction of edges is proposed. Simulation results indicate that our algorithms perform very well, even when more than one packet is lost during transmission of the JPEG coded image.