Jk. Han et Gc. Polyzos, MULTIRESOLUTION LAYERED CODING FOR REAL-TIME IMAGE TRANSMISSION - ARCHITECTURAL AND ERROR CONTROL CONSIDERATIONS, Real-time imaging, 4(4), 1998, pp. 275-298
We examine the rationale for and systems aspects of using layered codi
ng for the transmission of images and video over heterogeneous communi
cation networks. We advocate multi-resolution layered coding (MLC) and
present architectural alternatives that can support it within the sco
pe of existing standards and technologies. Since the premise of layere
d coding is controlled loss, the issues of error control and concealme
nt are central. We demonstrate that MLC exhibits good error tolerance,
effectively compensating for errors in situations where traditional e
rror concealment schemes, based on the interpolation of pixels in adja
cent blocks, are ineffective. In particular, MLC yields a higher peak
signal-to-noise ratio (PSNR) than two-layer coding when packet loss oc
curs in the base layer. Finally, we show that MLC can effectively expl
oit efficient network error control strategies which distribute redund
ancy non-uniformly and provide unequal levels of protection across lay
ers. (C) 1998 Academic Press.