iCAM ALGORITHM

Click here to download the iCAM algorithm implementation for Tone mapping that uses pfstools.

This is an implementation of Fairchild's iCAM [7] algorithm. The development started by experimenting with the code supplied with the DVD of the book by Erik Reinhard [2]. Unlike Reinhard's code, this code avoids using external FFT libraries. Instead, we added FFT code to the program. This FFT code follows the one provided in the “Numerical Recipes in C” book [8]. There is a contributed implementation of this algorithm by Kim Jin-Seo [9] available at Fairchild’s site. However, this uses GNU Scientific Library and works with MFC in Microsoft Visual C. You need to have cygwin [4] in windows to run this code. This code requires pfstools. This is an addition to PFSTMO implemented algorithms.

 DOWNLOAD-LINK for the Source-code from the DVD associated with "High Dynamic Range Imaging" by Erik Reinhard et. al. It has license similar to BSD. To see the license[3], click here.

There are 5 files in this implementation: tmo_icam.cpp, pfstmo_icam.cpp, tmo_icam.h, fft.h, and color_spaces.h.

The following optional parameters are present.

* @brief icam tone-mapping
*
* @param Y input luminance
* @param L output tonemapped intensities
* @param variance
* @param variance2
* @param D
* @param prescaling
* @param percentile
* @param indep
* @verbose:-v
* @help:-h

The following command in cygwin illustrates the use:
pfsin memorial.hdr | ./pfstmo_icam.exe | pfsout memorial.png

References and Links

[1] http://dragon.larc.nasa.gov/retinex/background/retpubs.html

[2] http://books.elsevier.com/companions/0125852630/hdri/html/hdri.html.

[3] www.umsl.edu/~sj550/myweb/lic_retinex_reinhard.htm

[4] http://www.cygwin.com/

[5] http://www.mpi-inf.mpg.de/resources/pfstools/

[6] http://www.mpi-inf.mpg.de/resources/tmo/

[7] http://www.cis.rit.edu/people/faculty/fairchild/PDFs/PAP18.pdf

M.D. Fairchild and G.M. Johnson, "The iCAM framework for image appearance, image differences, and image quality," Journal of Electronic Imaging, 13 126-138 (2004)

[8] http://www.nr.com/

[9] http://www.cis.rit.edu/mcsl/icam/pub/icam_c_code.zip

[10] http://www.cs.northwestern.edu/~jet/Publications/Tumblin_EGSR2003paper.pdf

Choudhury, P., Tumblin, J., "The Trilateral Filter for High Contrast Images and Meshes," Proc. of the Eurographics Symposium on Rendering, Per. H. Christensen and Daniel Cohen eds., pp. 186-196, 2003.

[11] http://www.cs.nott.ac.uk/%7Eqiu/hdri/PG05/PG05.html