based on Viola-Jones Feature Detection Algorithm using Haar Cascades

This is a port of OpenCV C++ Haar Detection (actually a port of JViolaJones which is a port of OpenCV for Java) to javascript and HTML5 canvas.

##Live Example http://foo123.github.com/examples/face-detection/

You can use the existing openCV cascades to build your detectors.

To do this just transform the opencv xml file to javascript using the haartojs java tool (in cascades folder)

example: ( to use opencv's haarcascades_frontalface_alt.xml run following command)

haartojs haarcascades_frontalface_alt

this creates a javascript file:
haarcascades_frontalface_alt.js
which you can include in your html file or node file

the variable to use in javascript is similarly
haarcascades_frontalface_alt

##ChangeLog

• initial commit by Nikos M. (works on browser)
• customization to work with node.js and require.js by maxired (using js closures)

##Usage Ideas

• SmileDetectJS
• ObjectDetect
• JSFeat

##Todo

• optimize detector for real-time usage on browsers (eg. reference-> https://github.com/liuliu/ccv)
• keep up with the changes in openCV cascades xml format

The Code works in the browser and inside node.js

##Runing inside the brower## Loading wth script tags You can run the example face.html or mouth.html inside your browser

##Running inside node## For running, the package have a dependency on canvas You can find an example inside examples/nodes.js Valide Output

node examples/node.js 
processing the picture
[{"x":102.5,"y":105.5,"width":160.66666666666666,"height":160.66666666666666}]

To work properly canvas need some system depencencies. You can find instruction on https://github.com/LearnBoost/node-canvas/wiki For example for Ubuntu :

sudo apt-get install libcairo2-dev libjpeg8-dev libpango1.0-dev libgif-dev

##Loading with RequireJS ## As a third option, you can load the library with requireJS, both on the browser on with node. There is an example of loading with RequireJS inside node in examples/require.js. The configuration would be the same inside a browser

Complete source code
(note: the java source classes, which parse the openCV xml cascades, will be added to the project also)

Contributor Nikos M.
URL Nikos Web Development
URL Haar.js blog post
URL WorkingClassCode

Contributor maxired