Phase Algorithm for Blocking Artifact Reduction in Reconstructions from Analysis-Only AM-FM Models

Virtually all techniques for computing AM-FM models involve jointly localized filterbanks and nonlinear approximations that preclude the possibility of perfect reconstruction. Although perfect reconstruction models have begun to emerge, they are currently of limited practical interest because of their large complexity. Thus, it is of interest to obtain approximate reconstructions from the analysis-only models because these provide insight into the accuracy of the AM and FM functions. However, the only existing 2-D reconstruction algorithm suffers from severe blocking artifacts that limit its usefulness in this regard. In this paper we present a new reconstruction algorithm that makes full use of all available phase reconstruction boundary conditions in a multipath interpolative scheme to eliminate the blocking artifacts, thereby dramatically improving the utility of the approximate reconstructions. 1