Compiling SSIM on Mac |
November 25th, 2014 |
| tech |
If you want to examine the distortion that comes from a lossy
compression algorithm, it's helpful to have a tool that's a good proxy
for asking a person "how similar are these two images"? The standard
algorithm for this is SSIM,
but there are several implementations. I was initially using Pornel's
dssim, but I wanted to
compare this to Mehdi's
SSIM. Mehdi's doesn't document how to compile it on a mac,
so here's what worked for me:
- Install OpenCV
- Download OpenCV for linux/mac. I downloaded 2.4.9 from opencv.org/downloads.
unzip ~/Downloads/opencv-2.4.9.zipcd ~/Downloads/opencv-2.4.9/mkdir build && cd buildcmake -G "Unix Makefiles" ..make -j8sudo make install
- Download
SSIM.ccp:wget http://mehdi.rabah.free.fr/SSIM/SSIM.cpp - The
SSIM.cppfile needs a small change: replace "#include <iostream.h>" with "#include <iostream>". - Compile with:
g++ -I/usr/local/include/opencv \ -L/usr/local/lib/ \ -lopencv_core \ -lopencv_highgui \ -lopencv_imgproc \ SSIM.cpp \ -o ssim - Enjoy using SSIM:
./ssim a-original.png a-modified.png