The following Matlab project contains the source code and Matlab examples used for directional discrete cosine transform. DDCT is demonstrated with different block size and different modes. The details algorithm can be referred at http://link.springer.com/article/10.1007/s12596-013-0148-7?no-access=true VPS Naidu "Hybrid DDCT-PCA based multi sensor image fusionJournal of Optics", Volume 43, Issue 1, pp 48-61, March 2014,