[WM]: DCT energy compression

[Boremi TOCH <tochb@aston.ac.uk>]

Hello watermarkers,

I've read in everal papers that the Discrete Cosine Transform has an
energy ( 
defined as the variance, as in Principle Components Analysis) compaction

property, and as such is a good approximation of PCA decomposition.
Though I have never seen this asumption been denied while experimenting
on 
audio signals, I'd like to know if there is a theoretical proof of this,
or 
any large experimental result which would give a little justification to
this. Thanks in advance

----
Boremi Toch,
MSc in Information Engineering and Computer Science
Aston University
Birmingham UK
B4 7ET





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