Cylon module for OpenCV

Cylon.js For OpenCV

Cylon.js ( is a JavaScript framework for robotics and physical computing using Node.js

This repository contains the Cylon adaptor and drivers for OpenCV (, the powerful open source computer vision platform.

Want to use Ruby on robots? Check out our sister project Artoo (

Want to use the Go programming language to power your robots? Check out our sister project Gobot (

$ npm install cylon cylon-opencv

In order to use OpenCV you first need to install it and make sure it is working correctly on your computer. You can follow the tutorials in the OpenCV site to install it in your particular OS:

sudo apt-get -y install autoconf automake build-essential git libass-dev libgpac-dev \
  libsdl1.2-dev libtheora-dev libtool libva-dev libvdpau-dev libvorbis-dev libx11-dev \
  libxext-dev libxfixes-dev pkg-config texi2html zlib1g-dev yasm libmp3lame-dev \
  libopus-dev libvpx-dev cmake libgtk2.0-dev pkg-config libjpeg8 libjpeg8-dev \
  libgstreamer0.10-0 libgstreamer0.10-dev gstreamer0.10-tools gstreamer0.10-plugins-base \
  libgstreamer-plugins-base0.10-dev gstreamer0.10-plugins-good gstreamer0.10-plugins-ugly \
  gstreamer0.10-plugins-bad gstreamer0.10-ffmpeg
mkdir ~/ffmpeg_sources
cd ~/ffmpeg_sources
git clone --depth 1 git://
cd x264
./configure --prefix="/usr/local" --bindir="/usr/local/bin" --enable-shared --enable-pic
sudo make install
cd ~/ffmpeg_sources
git clone --depth 1 git://
cd fdk-aac
autoreconf -fiv
./configure --prefix="/usr/local" --bindir="/usr/local/bin" --enable-shared --with-pic
sudo make install
cd ~/ffmpeg_sources
git clone --depth 1 git://
cd ffmpeg
export PKG_CONFIG_PATH="/usr/local/lib/pkgconfig"
./configure --prefix="/usr/local"   --extra-cflags="-I/usr/local/include" --extra-ldflags="-L/usr/local/lib"   --bindir="/usr/local/bin" \
  --extra-libs="-ldl" --enable-gpl --enable-libass --enable-libfdk-aac   --enable-libmp3lame --enable-libopus --enable-libtheora \
  --enable-libvorbis --enable-libvpx   --enable-libx264 --enable-nonfree --enable-x11grab --enable-shared --enable-pic
sudo make install
hash -r
cd ~
git clone --depth 1 -b
cd opencv
mkdir release
cd release
sudo make install

Using cylon-opencv is pretty easy, same as any other cylon adaptor making use of the appropiate cylon drivers.

The following example shows how to connect to a camera and display the video feed in a window.

Before running it be sure that haarcascade_frontalface_alt.xml file is referenced to the correct location. You can download the file here.

var Cylon = require('cylon');
  connections: {
    opencv: { adaptor: 'opencv' }
  devices: {
    window: { driver: 'window' },
    camera: {
      driver: 'camera',
      camera: 1,
      haarcascade: __dirname + "/examples/opencv/haarcascade_frontalface_alt.xml"
  workfunction(my) {'cameraReady', function() {
      console.log('The camera is ready!')
      // We listen for frame ready event, when triggered 
      // we display the frame/image passed as an argument 
      // and we tell the window to wait 40 milliseconds'frameReady', function(errim) {
        console.log("FRAMEREADY!");, 40);
      // Here we have two options to start reading frames from 
      // the camera feed. 
      // 1. As fast as possible triggering the next frame read 
      //    in the listener for frameReady, if you need video 
      //    as smooth as possible uncomment 
      //    in the listener above and the one below this comment. 
      // 2. Use an interval of time to try and get aset amount 
      //    of frames per second  (FPS), in the next example 
      //    we are trying to get 1 frame every 50 milliseconds 
      //    (20 FPS). 
      every(50, function() {; });

In order to use OpenCV you first need to install it and make sure it is working correctly on your computer. You can follow the tutorials in the OpenCV site to install it in your particular OS:

How to install OpenCV

We're busy adding documentation to our web site at please check there as we continue to work on Cylon.js

Thank you!

  • All patches must be provided under the Apache 2.0 License
  • Please use the -s option in git to "sign off" that the commit is your work and you are providing it under the Apache 2.0 License
  • Submit a Github Pull Request to the appropriate branch and ideally discuss the changes with us in IRC.
  • We will look at the patch, test it out, and give you feedback.
  • Avoid doing minor whitespace changes, renamings, etc. along with merged content. These will be done by the maintainers from time to time but they can complicate merges and should be done seperately.
  • Take care to maintain the existing coding style.
  • Add unit tests for any new or changed functionality & Lint and test your code using Grunt.
  • All pull requests should be "fast forward"
    • If there are commits after yours use “git rebase -i <new_head_branch>”
    • If you have local changes you may need to use “git stash”
    • For git help see progit which is an awesome (and free) book on git

Version 0.13.0 - Compatibility with Cylon 1.0.0

Version 0.12.1 - Upd package to use main node-opencv repo now that it supports pre-compiled binaries

Version 0.12.0 - Compatibility with Cylon 0.22.0

Version 0.11.0 - Compatibility with Cylon 0.21.0

Version 0.10.1 - Use Hybrid Group fork of node-opencv

Version 0.10.0 - Compatibility with Cylon 0.20.0

Version 0.9.0 - Compatibility with Cylon 0.19.0

Version 0.8.0 - Compatibility with Cylon 0.18.0

Version 0.7.0 - Compatibility with Cylon 0.16.0

Version 0.6.1 - Add peerDependencies to package.json

Version 0.6.0 - Compatibility with Cylon 0.15.0

Version 0.5.0 - Compatibility with Cylon 0.14.0, remove node-namespace.

Version 0.4.0 - Release for Cylon.js 0.12.0

Version 0.3.0 - Release for Cylon.js 0.11.0, refactor to pure JavaScript, driver for general image processing

Version 0.2.0 - Release for Cylon.js 0.10.0

Version 0.1.0 - Initial release

Copyright (c) 2013-2014 The Hybrid Group. Licensed under the Apache 2.0 license.