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Signal Processing

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  • $\begingroup$ your welcome. In the mean time, until your ordered books arrive, you can have a look at the following paper, which braodly explains the use of DCT in image and video coding: s000.tinyupload.com/?file_id=10310508805072810917 $\endgroup$ Commented Feb 8, 2015 at 20:57
  • $\begingroup$ Packs energy into low frequency components for many natural images. You can contrive non-natural images for which the DCT is bad, but you may have better luck with DFT. There is some work by Jain and others which one can look up that says that the Karhunen-Loeve Transform of a AR(1) process looks like a DCT in some sense, which can be used as one justification for why its good as well. $\endgroup$ Commented May 4, 2015 at 20:52