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Optical Engineering

Three-dimensional subband coding of an image sequence based on temporally adaptive decomposition
Author(s): Yong-Kwan Kim; Rin Chul Kim; Sang Uk Lee
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Paper Abstract

We propose a temporally adaptive 3-D subband coding (3-D SBC) technique to effectively exploit the temporal activities in the input image sequence. By using the rate-distortion (R-D) performance measure, we show the optimal number of temporal subbands can be easily determined. The base temporal subband, which yields much concentrated energy, is encoded using the H.261-like motion-compensated discrete cosine transform (MC-DCT) technique. While in the higher temporal subbands, the two-dimensional (2-D) adaptive wavelet packet bases are employed to exploit the various energy distributions, due to the moving components. In encoding the subbands, we employ adaptive scanning methods, followed by uniform step-size quantization with variablelength coding (VLC), and a coded/not-coded flag reduction technique based on the quadtree structure. From the simulation results, the proposed 3-D SBC provides about 0.29- to 3.14-dB PSNR gain over the H.261 technique and the temporally fixed 3-D SBC techniques at bit rates 300 to 512 Kbits/s.

Paper Details

Date Published: 1 November 1996
PDF: 10 pages
Opt. Eng. 35(11) doi: 10.1117/1.601063
Published in: Optical Engineering Volume 35, Issue 11
Show Author Affiliations
Yong-Kwan Kim, Seoul National Univ. (South Korea)
Rin Chul Kim, Seoul National Univ. (South Korea)
Sang Uk Lee, Seoul National Univ. (South Korea)

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