Abstract | ||
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In this paper, we present a wavelet-based hybrid video coding system with spatial and quality scalability. The proposed video codec is based on 2-D wavelet transform, a modified form of set partitioning in hierarchical trees (SPIHT), called virtual SPIHT (VSPIHT) and temporal motion estimation/compensation. The quantisation and encoding of wavelet coefficients are performed by the colour VSPIHT (CVSPIHT) algorithm. The spatial scalability is achieved by re-organising the bit-stream into layers, one for each spatial resolution. The quality scalability is added through locking the motion compensation loop of the encoder and decoder at a fixed rate. This fixed loop rate is less than or equal to the target bit-rate. The scalability in the standard codec like H.263 is achieved by layered approach and each additional layer requires 20–25% extra overhead, whereas our scalable coder requires less than 1% overhead for spatial scalability and negligible overhead for quality scalability. The simulation results demonstrate that the proposed coder outperforms a layered H.263 codec in terms of both objective and subjective quality. |
Year | DOI | Venue |
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2004 | 10.1016/j.image.2003.08.019 | Signal Processing: Image Communication |
Keywords | Field | DocType |
Zerotree,SPIHT,Wavelet transform,Spatial scalability,SNR scalability,Video coding | Set partitioning in hierarchical trees,Computer science,Motion compensation,Theoretical computer science,Encoder,Motion estimation,Codec,Wavelet,Wavelet transform,Scalability | Journal |
Volume | Issue | ISSN |
19 | 3 | 0923-5965 |
Citations | PageRank | References |
3 | 0.42 | 13 |
Authors | ||
2 |
Name | Order | Citations | PageRank |
---|---|---|---|
E. Khan | 1 | 56 | 12.71 |
Mohammed Ghanbari | 2 | 1197 | 169.16 |