Spatial resolution enhancement residual coding using hybrid wavelets and directional filter banks

Traditional video coding uses classical predictive coding techniques, where a signal is initially approximated by taking advantage of the various redundancies present. Most of the video coding standards, including the latest HEVC, use the well-accepted procedure of applying transform coding on self-contained (intra) and inter-predicted frame residuals. Nevertheless, it has been shown in the literature that, a normal video frames possess distinct characteristics compared to a residual frame. In this paper, we have made use of hybrid wavelet transforms and directional filter banks (HWD) to encode resolution enhancement residuals in the context of scalable video coding. The results are presented for the use of HWD in the framework of the Dirac video codec. The experiments are carried out on a variety of test frames. Our experiments on residue coding using HWD show better performance compared to the conventional DWT, when tested on the same platform of the well-known SPIHT algorithm.