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:

  1. Install OpenCV
    1. Download OpenCV for linux/mac. I downloaded 2.4.9 from opencv.org/downloads.
    2. unzip ~/Downloads/opencv-2.4.9.zip
    3. cd ~/Downloads/opencv-2.4.9/
    4. mkdir build && cd build
    5. cmake -G "Unix Makefiles" ..
    6. make -j8
    7. sudo make install
  2. Download SSIM.ccp: wget http://mehdi.rabah.free.fr/SSIM/SSIM.cpp
  3. The SSIM.cpp file needs a small change: replace "#include <iostream.h>" with "#include <iostream>".
  4. Compile with: 
    g++ -I/usr/local/include/opencv \
    -L/usr/local/lib/ \
    -lopencv_core \
    -lopencv_highgui \
    -lopencv_imgproc \
    SSIM.cpp \
    -o ssim
  5. Enjoy using SSIM: ./ssim a-original.png a-modified.png

Comment via: substack

Recent posts on blogs I like:

Linkpost for July

Effective Altruism

via Thing of Things July 3, 2026

Agentic test processes, LLM benchmarks, and other notes on agentic coding from Galapagos Island

I've been using AI fairly heavily since last November and the whole thing is a funny experience. An agent will do something that, if a human did it, you'd immediately fire them. My reaction, of course, is to act as if this is great and spin up a t…

via Posts on July 3, 2026

Variable fonts aren't universally supported

I make a lot of webpages. I also use Lockdown Mode on iOS and MacOS for a bit of extra security. Sometimes I realize that I forgot to test on Safari and it looks like crap, or I test and don’t notice that there’s been a problem for months (as was the case…

via Home June 27, 2026

more     (via openring)