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README.md

The implementation of Visual Difference Predicator (VDP) and Visual Difference Predicator for High Dynamic Range images (HDR VDP)

The standard VDP implementation was based on:

Scott Daly, The Visible Differences Predictor: An algorithm for the assessment of image fidelity. Digital Image and Human Vision, Cambridge, MA: MIT Press, A. Watson, Ed., 179-206. (1993)

and

Scott Daly, The visible differences predictor: an algorithm for the assessment of image fidelity, SPIE Vol. 1666 Human Vision, Visual Processing, and Digital Display III 1992

and

US patent US5,394,483

and some comments from Scott Daly.

Note that not all parameters for the model are known so there may be some discrepancies between this implementation and the orignal implementation from that paper.

The HDR version (HDR VDP) was based on:

Rafal Mantiuk, Scott Daly, Karol Myszkowski and Hans-Peter Seidel. Predicting Visible Differences in High Dynamic Range Images - Model and its Calibration. In: Proc. of Human Vision and Electronic Imaging X, IS&T/SPIE's 17th Annual Symposium on Electronic Imaging 2005. pp. 204-214

and

Rafal Mantiuk, Karol Myszkowski and Hans-Peter Seidel Visible Difference Predicator for High Dynamic Range Images In: Proc. of IEEE International Conference on Systems, Man and Cybernetics, 2004. pp. 2763-2769

The sources should compile under all variants of Linux and cygwin. Compilation under OSX may require some small changes.

Since the original version of VDP has not been maintained for quite some time, I would strongly recommend using HDR VDP. HDR VDP has the same capabilities as VDP, but should give more consistent predictions for much larger dynamic range. It also includes aspect that are missing in the original VDP, such as the optics of the eye (OTF).

License

The source code is available under General Public Licence (GPL) (see COPYING file). If you find this software useful and you have used it for your project or paper, please state which version you are using and cite the following paper:

Rafal Mantiuk,Scott Daly, Karol Myszkowski, Hans-Peter Seidel
Predicting Visible Differences in High Dynamic Range Images -
Model and its Calibration
In: Proc. of Human Vision and Electronic Imaging X, IS&T/SPIE's 17th Annual Symposium on Electronic Imaging 2005. pp. 204-214

@inproceedings{mantiuk:2005:PredVisDiff,
  author = {Mantiuk, Rafa{\l} and Daly, Scott and Myszkowski, Karol and Seidel, Hans-Peter},
  editor = {Rogowitz, Bernice E. and Pappas, Thrasyvoulos N. and Daly, Scott J.},
  title = {Predicting Visible Differences in High Dynamic Range Images - Model and its Calibration},
  booktitle = {Human Vision and Electronic Imaging X, IS\&T\/SPIE's 17th Annual Symposium on Electronic Imaging (2005)},
  year = {2005},
  volume = {5666},
  pages = {204--214},
  isbn = {0277-786X},
}

Dependencies:

The code requires two libraries to compile:

  • For Fast Fourier Transformation. fftw 3.0 and later (fftw3f - 32bit float version) http://www.fftw.org/ Note: add --enable-float switch when running ./configure script. Otherwise 32bit float version of the library won't be generated.

  • To read and write HDR images pfstools http://pfstools.sourceforge.net/

  • Besides the libraries, netpbm package is needed to write .png files, which are the output of the 'vdp' frontend. http://netpbm.sourceforge.net/

Mac:

brew install fftw

Ubuntu:

apt-get install 

Compilation

This software uses standard automake and autoconf scripts to configure, compile, and install. To configure issue a command:

./configure

The default installation location is /usr/local. If you want to specify different location, give a parameter:

./configure --prefix=$HOME/local

To compile:

make

To install (for /usr/local must be root user):

make install

If are compiling sources from the CVS, run ./bootstrap script to generate ./configure script.

Documentation

Detailed description how to use vdp can be found in the manual pages. To view documentation, check 'man vdp', man 'vdpcmp', and 'man vis'.

Low Dynamic Range Images

Starting from the version 1.3 the vdp script can automatically recognize low dynamic range images and convert them from sRGB to XYZ. See the man pages of vdp and vdpcmp for more information.

Note

This implementation of the Visual Difference Predicator (VDP) was initially based on Karol Myszkowski's SGI code. However, it was progressively ported, redesigned and reimplemented.