Title :
Video coding for IP transmission by using polyphase downsampling multiple description
Author :
Caramma, M. ; Fumagalli, M. ; Lancini, R.
Author_Institution :
CEFRIEL, Politecnico di Milano, Italy
Abstract :
When transmitting data over heterogeneous networks, there may be situations which necessitate dropping packets, for example, to accommodate a lower capacity or when congestion occurs. If retransmission of the lost packets is not feasible (e.g. for real time applications), we have to design a decoder able to recover significant information from the received packets. The literature suggests resolving this issue by using generalized multiple description coding (GMDC): it is source coding for multiple channels such that a decoder, which receives an arbitrary subset of the channels, may produce a useful reconstruction. In this work, we present a multiple description (MD) system based on a polyphase downsampling algorithm that splits an image source into an arbitrary number of balanced descriptions. Our goal is to obtain both the best reconstruction quality from the received descriptions (also only one) and a subjective indistinguishable reconstruction from the original if all the descriptions are available. Our specific interest is the communication of still images, but we think that our method is advantageous in other application such as video and audio.
Keywords :
audio coding; decoding; image coding; image reconstruction; image sampling; source coding; telecommunication channels; video coding; IP transmission; audio; congestion; generalized multiple description coding; heterogeneous networks; image reconstruction; lower capacity; multiple channels; packet dropping; polyphase downsampling multiple description; source coding; still images; video coding; Arithmetic; Biomedical imaging; Decoding; Ear; Image coding; Image reconstruction; Image sampling; PSNR; Source coding; Video coding;
Conference_Titel :
EUROCON'2001, Trends in Communications, International Conference on.
Conference_Location :
Bratislava, Slovakia
Print_ISBN :
0-7803-6490-2
DOI :
10.1109/EURCON.2001.938137