TITLE:
Iterative Soft Decoding of Multiple Description Image over Wireless Channel
AUTHORS:
Saikat Majumder, Shrish Verma
KEYWORDS:
EREC, Chase-Like Decoder, Multiple Description Image Coding, Wireless Networks
JOURNAL NAME:
Journal of Computer and Communications,
Vol.2 No.8,
June
25,
2014
ABSTRACT: Motivated by recent
results in multiple description image coding over wireless networks, we propose
a scheme for transmission of multiple descriptions through hybrid packet loss
and additive white Gaussian noise channel. Each description is coded into multiple
bitstreams by applying SPIHT coding on wavelet trees along spatial orientations
and each stream is further compressed using arithmetic code. Use of error
resilient entropy coding (EREC) is proposed in literature for synchronization
requirement of variable length codes, but EREC is not compatible with iterative
soft-in soft-out decoding of arithmetic code at the receiver. We propose the
application of EREC assisted by state and tail bits (ERECST) in conjunction
with iterative decoding of arithmetic code at receiver for reconstructing the
multiple description coded image over packet loss and Gaussian noise channel.
Experimental results demonstrate that an additional gain of 7 dB in PSNR is
obtained over existing scheme.