Coherent Multiscale Image Processing Using Dual-Tree Quaternion Wavelets Chan, Wai Lam ; Choi, Hyeokho ; Baraniuk, Richard G. Abstract Publication: IEEE Transactions on Image Processing Pub Date: July 2008 DOI: 10.1109/TIP.2008.924282 Bibcode: 2008ITIP...17.1069C