Introduction

This special issue of AADA is devoted to the research topics presented in the highly stimulating international workshop on "Sparse Representation of Multiscale Data and Images: Theory and Applications", which was held in the Institute for Advanced Studies at the Nanyang Technological University (NTU) at Singapore from December 14 to 17, 2009. This workshop was co organized by Thomas Hou (Caltech, USA) and Xue-Cheng Tai (NTU, Singarpore).