Multi-resolution Layered Coding for Real-Time Image Transmission: Architectural and Error Control Considerations
✍ Scribed by James K. Han; George C. Polyzos
- Publisher
- Elsevier Science
- Year
- 1998
- Tongue
- English
- Weight
- 877 KB
- Volume
- 4
- Category
- Article
- ISSN
- 1077-2014
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✦ Synopsis
Multi-resolution Layered Coding for Real-Time Image Transmission: Architectural and Error Control Considerations
e examine the rationale for and systems aspects of using layered coding for the transmission of images and video over heterogeneous communication networks. We advocate multi-resolution Wl ayered coding (MLC) and present architectural alternatives that can support it within the scope of existing standards and technologies. Since the premise of layered coding is controlled loss, the issues of error control and concealment are central. We demonstrate that MLC exhibits good error tolerance, effectively compensating for errors in situations where traditional error concealment schemes, based on the interpolation of pixels in adjacent blocks, are ineffective. In particular, MLC yields a higher peak signal-to-noise ratio (PSNR) than two-layer coding when packet loss occurs in the base layer. Finally, we show that MLC can effectively exploit efficient network error control strategies which distribute redundancy non-uniformly and provide unequal levels of protection across layers.