Ali Tabatabai

Sub-Band Coding Of Digital Images Using Two-Dimensional Quadrature Mirror Filtering

Computer simulation results of sub-band coding of digital images using Quadrature Mirror Filtering (QMF) techniqueb are reported. Conditions specifying two-dimensional QMF design constraints are derived. The spectrum of the input signal is then decomposed non-uniformly into sub-band images. In the coding process, the lowest band is DPCM coded using a two-dimensional prediction scheme. The remaining bands are PCM coded by a quantizer which minimizes the perceived distortion of the reconstructed signal. The results are then presented in terms of subjective quality of the reconstructed pictures, SNR, and the resulting bit rate.

Application of binning codes to video coding

There are several problems in video coding that can not be adequately addressed through the use of conventional source coding techniques. For instance, any video coding system that is based on a predictive framework will suffer from performance degradations if there is uncertainty in the predictions. In this paper, we propose a method that incorporates binning codes and channel decoding to address video coding problems that have multiple possible predictions at the decoder. We will propose solutions based on binning codes to three separate problems in video coding and show that the results are superior to pre-existing methods.