Multiple Description Coding for Region of Interest Based on SPIHT
Cheng Wu · Chinese Journal of Computers · 2006
A new multiple description SPIHT coding for region of interest(ROI) is proposed to combat packet loss.The method codes the SPIHT bit stream into multiple descriptions,each with a variable number of fully coded original trees and partially coded redundant trees.After reordering the zero trees of wavelet according to their importance,the method assign different coding rates of(original) trees and redundant trees to each description.The more important parts of each tree are sent in more description than the less important parts,and in order to further improve the error resilience of ROI,more redundant trees are assigned to ROI than non-ROI.The relationship(among) zero trees,redundant trees and their coding rates are analyzed,and the algorithm of sorting process and assigning strategy of redundant trees are also presented in detail.Simulation results show that the method can further improve the reconstructed quality of ROI in the case of packet loss compared to other ROI coding methods.