This DSSIM program has been created by Philipp Klaus Krause based on
Rabah Mehdi's C++ implementation of SSIM (http://mehdi.rabah.free.fr/SSIM).
Originally it has been created for the VMV '09 paper
"ftc - floating precision texture compression" by Philipp Klaus Krause.

The latest version of this program can probably be found somewhere at
http://www.colecovision.eu.

It can be compiled using g++ -I/usr/include/opencv -lcv -lhighgui dssim.cpp
Make sure OpenCV is installed (e.g. for Debian/ubuntu: apt-get install
libcv-dev libhighgui-dev).

DSSIM is described in
"Structural Similarity-Based Object Tracking in Video Sequences" by Loza et al.
however setting all Ci to 0 as proposed there results in numerical instabilities.
Thus this implementation used the Ci from the SSIM implementation.
SSIM is described in
"Image quality assessment: from error visibility to structural similarity" by Wang et al.