bionic-eye

Right now, a pretty basic translation of the OpenCV Java tutorial into clojure, updated to use the OpenCV 3.0 APIs.

Setup

Getting OpenCV and clojure to play nice is mostly based on the approach from this tutorial, although I installed OpenCV using homebrew instead of compiling from scratch.

Install OpenCV

This will probably take a while to compile...

% brew tap homebrew/science
% brew install opencv3 --with-java --with-tbb --with-contrib

Install the OpenCV libs as local Maven artifacts

We want to be able to refer to OpenCV as a dependency in our project.clj, so we need to install the OpenCV java API and the native library into our local Maven repo.

First, install the lein-localrepo plugin by adding it to your ~/.lein/profiles.clj:

{:user {:plugins [[lein-localrepo "0.5.3"]]}

Then we need to make a JAR for the OpenCV native lib, and install it and the main OpenCV jar into our local repo.

% mkdir ~/scratchdir
% cd ~/scratchdir

# Wrap the native lib in a JAR
% mkdir -p native/macosx/x86_64
% cp /usr/local/opt/opencv3/share/OpenCV/java/libopencv_java300.dylib ./native/macosx/x86_64
% jar -cMf opencv-native-300.jar native

# Install using localrepo lein plugin
% cp /usr/local/opt/opencv3/share/OpenCV/java/opencv-300.jar .
% lein localrepo install opencv-300.jar opencv/opencv 3.0.0
% lein localrepo install opencv-native-300.jar opencv/opencv-native 3.0.0

# can get rid of our working dir now
% cd
% rm -rf scratchdir

Now we can refer to opencv/opencv and opencv/opencv-native in our project.clj like any other dependency.

Usage

Fire up a repl in your favorite clojure environment. I like cursive, but you can use whatever :) If you don't want to muck about setting up an editor, you can just use lein repl.

% lein repl

user=> (load-file "src/bionic_eye/core.clj")
nil
user=> (in-ns 'bionic-eye.core)
#object[clojure.lang.Namespace 0x1e44e3e9 "bionic-eye.core"]
bionic-eye.core=> (detect-face lena "/tmp/lena-face.png")
true

That should dump a lena-face.png file in /tmp with the Lena's famous face outlined with a green rectangle.