Contourlet
![Contourlet Transform Double Filter Bank](/Images/godic/202501/06/Contourlet_Transform_Double_Filter_Bank2839.jpg")
![Nonsubsampled Contourlet Transform](/Images/godic/202501/06/Nonsubsampled_Contourlet_Transform2839.jpg")
![Wavelet-based contourlet packet using 3 dyadic wavelet levels and 8 directions at the finest level.](/Images/godic/202501/06/Wavelet-based_contourlet_packet2839.jpg")
Contourlets form a multiresolution directional tight frame designed to efficiently approximate images made of smooth regions separated by smooth boundaries. The Contourlet transform has a fast implementation based on a Laplacian Pyramid decomposition followed by directional filterbanks applied on each bandpass subband.