Video coding with fixed-length packetization for a tandem channel.
IEEE Trans Image Process
; 15(2): 273-88, 2006 Feb.
Article
em En
| MEDLINE
| ID: mdl-16479798
ABSTRACT
A robust scheme is presented for the efficient transmission of packet video over a tandem wireless Internet channel. This channel is assumed to have bit errors (due to noise and fading on the wireless portion of the channel) and packet erasures (due to congestion on the wired portion). First, we propose an algorithm to optimally switch between intracoding and intercoding for a video coder that operates on a packet-switched network with fixed-length packets. Different re-synchronization schemes are considered and compared. This optimal mode selection algorithm is integrated with an efficient channel encoder, a cyclic redundancy check outer coder concatenated with an inner rate-compatible punctured convolutional coder. The system performance is both analyzed and simulated. Last, the framework is extended to operate on a time-varying wireless Internet channel with feedback information from the receiver. Both instantaneous feedback and delayed feedback are evaluated, and an improved method of refined distortion estimation for encoding is presented and simulated for the case of delayed feedback.
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Base de dados:
MEDLINE
Assunto principal:
Gravação em Vídeo
/
Algoritmos
/
Processamento de Sinais Assistido por Computador
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Interpretação de Imagem Assistida por Computador
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Aumento da Imagem
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Internet
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Compressão de Dados
Idioma:
En
Ano de publicação:
2006
Tipo de documento:
Article