README for ICIP09-color-wm

Version 0.1; November 20, 2009

MATLAB code implementing and testing the multivariate power-exponential (MPE) detector for additive 
watermarking in the DWT domain coefficient of color images proposed in the paper

Roland Kwitt, Peter Meerwald, Andreas Uhl, "Color-Image Watermarking using Multivariate Power-Exponential Distribution", In Proceedings 
of the IEEE International Conference on Image Processing, ICIP '09, pp. 4245-4248, Cairo, Egypt, November 7 - 11, 2009.

See http://wavelab.at/sources.


How to run:

Populare the img/ directory with 768x512 color images in .ppm format, e.g. from http://www.r0k.us/graphics/kodak/

test_all.m produces a file results.txt in directory out/ with probability of miss for the LC-L, LC-J, LC-KLT, LRT-GGD-L and MPE detector on the test images in img/. Also the theoretical and experimental parameters of the detection statistic under H0 (needed to compute the detection threshold) are provided.

pdf2eps.m plots the MPE PDF in .eps format in directory out/. PDF parameters can be adjusted in the file.

corr2eps.m produces a scatter-plot in .eps format in directory out/ showing the HL2 subband coefficient dependency between RGB color channels (decomposition level 3). Parameters can be adjusted in the file.

Dependencies:

The following programs and libraries need to be installed and in the 
execution path (shell or MATLAB):
* Minh N. Do's MATLAB implementation of the moment matching and 
  maximum likelihood estimators for the generalized Gaussian 
  density, http://www.ifp.uiuc.edu/~minhdo/software/
* Nikola Sprljan's MATLAB Quality Assessment toolbox (v1.10),
  http://sprljan.com/nikola/matlab/qassessment.html
* R. C. Gonzalez, R. E. Woods, & S. L. Eddins, 
  Digital Image Processing Using MATLAB, Prentice-Hall, 2004 
  DIPUM toolbox; covmatrix.m and princomp.m



The code has been tested under Debian and Ubuntu Linux and MATLAB 7.4.


Disclaimer:

This material is distributed in the hope that it will be useful, but 
WITHOUT ANY WARRANTY. No author or distributor accepts responsibility
to anyone for the consequences of using it or for whether it serves 
any particular purpose or works at all.

The material is prepared strictly for research use only, commercial use 
is prohibited. Do not distribute the material without written permission.
If you publish any work based on this code, please cite the original 
paper.


Contact:

Please address any technical questions to 

  Roland Kwitt (rkwitt@cosy.sbg.ac.at), or 
  Peter Meerwald (pmeerw@cosy.sbg.ac.at) 

or write to

  Andreas Uhl
  Department of Computer Sciences
  Universität Salzburg
  Jakob-Haringer-Str. 2
  A-5020 Salzburg
  AUSTRIA
  Telephone: ++43 (0)662 8044 6303
  Fax: ++43 (0)662 8044 172 
  Email: uhl@cosy.sbg.ac.at