Jingyu Yang Wenli Xu Yao Wang Qionghai Dai 2-D anisotropic dual-tree complex wavelet packets and its application to image denoising. 2328-2331 2008 ICIP http://dx.doi.org/10.1109/ICIP.2008.4712258 conf/icip/2008 db/conf/icip/icip2008.html#YangXWD08