This package provides source code for some watermarking algorithms in portable
C code. Currently it includes the following

  watermarking algorithms

    Bruyndonckx
      refer to
        O. Bruyndonckx, Jean-Jacques Quisquater, and Benoit M. Macq. 
        Spatial method for copyright labeling of digital images. 
        In IEEE Workshop on Nonlinear Signal and Image Processing '95, 
        Thessaloniki, Greece, pages 456 - 459, 1995. 

    Corvi
      refer to
        Marco Corvi and Gianluca Nicchiotti. 
        Wavelet-based image watermarking for copyright protection. 
        In Scandinavian Conference on Image Analysis SCIA '97, Lappeenranta, 
        Finland, June 1997. 

    Cox 
      refer to
	Ingemar J. Cox, Joe Kilian, Tom Leighton, and Talal G. Shamoon. 
	Secure spread spectrum watermarking for multimedia. 
	In Proceedings of the IEEE ICIP '97, 
	volume 6, pages 1673 - 1687, Santa Barbara, California, USA, 1997. 

    Dugad
      refer to
        Rakesh Dugad, Krishna Ratakonda, and Narendra Ahuja.
        A new wavelet-based scheme for watermarking images. In Proceedings of
        the IEEE International Conference on Image Processing, ICIP '98,
        Chicago, IL, USA, October 1998.

    Fridrich (2. scheme)
      refer to
        Jiri Fridrich.
        Combining low-frequency and spread spectrum watermarking. In
        Proceedings of the SPIE Symposium on Optical Science, Engineering and
        Instrumentation, San Diego, USA, July 1998.

    Koch
      refer to
        Eckhard Koch and Jian Zhao. 
        Towards robust and hidden image copyright labeling. 
        In Proceedings of the IEEE International Workshop on Nonlinear 
        Signal and Image Processing, pages 452 - 455, Halkidiki, Marmaras, 
        Greece, June 1995. 

    Kim
      refer to
        Jong Ryul Kim and Young Shik Moon. 
        A robust wavelet-based digital watermark using level-adaptive
        thresholding. In Proceedings of the 6th IEEE International
        Conference on Image Processing ICIP '99, page 202,
        Kobe, Japan, October 1999. 

    Wang
      refer to
        Houng-Jyh Wang, Po-Chyi Su, and C.-C. Jay Kuo.
        Wavelet-based digital image watermarking. Optics Express, 3
        pp. 497, December 1998.

    Xia
      refer to
        Xiang-Gen Xia, Charles G. Boncelet, and Gonzalo R. Arce. 
        Wavelet transform based watermark for digital images. Optics Express, 3
        pp. 497, December 1998. 

    Xie
      refer to
        Liehua Xie and Gonzalo R. Arce. 
        Joint wavelet compression and authentication watermarking. In 
        Proceedings of the IEEE International Conference on Image Processing, 
        ICIP '98, Chicago, IL, USA, 1998. 

    Zhu
      refer to
       Wenwu Zhu, Zixiang Xiong, and Ya-Qin Zhang.
       Multiresolution watermarking for images and video: a unified approach.
       In Proceedings of the IEEE International Conference o

    many more algorithms to come! 
    see what is in stock: http://www.cosy.sbg.ac.at/~pmeerw/Watermarking

  and utility programs

    cmp_pgm	- compute difference image, PSNR, ...
    cmp_dct	- compute full-frame DCT domain difference image
    cmp_dct8x8  - compute 8x8 block-based DCT difference image
    cmp_dwt     - compute DWT domain difference image

What do I need?

Unix (Linux), a reasonable C compiler (GCC), and the netpbm library which you 
can get at http://wuarchive.wustl.edu/graphics/graphics/packages/NetPBM/


Directions: How do I use the stuff?

look at the MAKEFILE...
each algorithms has at least 4 files: gen_algo_sig.c, wm_algo_e.c, wm_algo_d.c,
cmp_algo_sig.c where 'algo' is the name of the actual watermarking algorithm 
(usually the principal author's name), where might also be some common files 
for each algorithm, algo_common.{c|h}, and some support files for sorting,
the DCT, ...

just try
  
  make
  make test

next, try to run each program with the -h parameter to find out what options 
are supported - the programs are pretty consistent and have reasonable
default settings

e.g. 

  wm_cox_e -h

The programs all support standard input and standard output, the only
supported image file format is PGM for grayscale images and PPM for color
images; most programs have only been tested with 512x512 images.
You can find the Lena image in PGM format in the images/ sub-directory.


Disclaimer: #include <disclaimer.h>

Feel free to use the accompaigning code for your research! However, I do
not guarantee for anything, in particular parts of the provided code may
be covered by copyrights of a third party or by patent claims. I do not
guarantee for any functionality, bla-bla, ...

If you use the accompanying code, please cite my thesis:

  Peter Meerwald, Digital Image Watermarking in the Wavelet Transform Domain, 
  Master's Thesis, Department of Scientific Computing, University of Salzburg,
  Austria, January 2001.


Contact: Comments are welcome!

More algorithms will be added over time, I have implemented about 13
watermarking algorithms in the spatial-, DCT-, and wavelet domain so far.
Please report what problems you have, suggestions, ...

Peter Meerwald

Dept. of Scientific Computing
University of Salzburg
Jakob-Haringer-Str. 2
A-5020 Salzburg 
AUSTRIA

pmeerw@cosy.sbg.ac.at
http://www.cosy.sbg.ac.at/~pmeerw/Watermarking

+43-662-8044-6327