| タイトル | Vector quantization for efficient coding of upper subbands |
| 本文（外部サイト） | http://hdl.handle.net/2060/19950005349 |
| 著者（英） | Huang, Y. F.; Zeng, W. J. |
| 著者所属（英） | Notre Dame Univ. |
| 発行日 | 1994-01-01 |
| 言語 | eng |
| 内容記述 | This paper examines the application of vector quantization (VQ) to exploit both intra-band and inter-band redundancy in subband coding. The focus here is on the exploitation of inter-band dependency. It is shown that VQ is particularly suitable and effective for coding the upper subbands. Three subband decomposition-based VQ coding schemes are proposed here to exploit the inter-band dependency by making full use of the extra flexibility of VQ approach over scalar quantization. A quadtree-based variable rate VQ (VRVQ) scheme which takes full advantage of the intra-band and inter-band redundancy is first proposed. Then, a more easily implementable alternative based on an efficient block-based edge estimation technique is employed to overcome the implementational barriers of the first scheme. Finally, a predictive VQ scheme formulated in the context of finite state VQ is proposed to further exploit the dependency among different subbands. A VRVQ scheme proposed elsewhere is extended to provide an efficient bit allocation procedure. Simulation results show that these three hybrid techniques have advantages, in terms of peak signal-to-noise ratio (PSNR) and complexity, over other existing subband-VQ approaches. |
| NASA分類 | COMPUTER PROGRAMMING AND SOFTWARE |
| レポートNO | 95N11762
NASA-CR-196804
NAS 1.26:196804 |
| 権利 | No Copyright |
