The initial Open Computer Vision library was originally developed by Intel Corporation. Recent development has been headed by Willow Garage, Inc.

Current OpenCV Sourceforge Project opencv.willowgarage.com/wiki/

Earlier OpenCV Sourceforge Project sourceforge.net/projects/opencvlibrary/

Ruby/OpenCV Author’s Web Page blueruby.mydns.jp/opencv

OpenCV Ruby Wrapper

• First release rubygems, Some OpenCV functions wrapped.

This gem relies on the OpenCV project. There are a number of ways to install the library. Building the latest from source is preferred on OSX:

http://opencv.willowgarage.com/wiki/Mac_OS_X_OpenCV_Port

This also contains the data for the default cascades.

You can install by cloning this repository:

git clone git://github.com/jeffrafter/ruby-opencv.git

Then inside the ruby-opencv folder run:

ruby ext/extconf.rb
make
sudo make install

Once installed it is possible to show images via GUI Window.

require "rubygems"
gem "opencv"
require "opencv"

image = OpenCV::IplImage.load("sample.jpg")
window = OpenCV::GUI::Window.new("preview")
window.show(image)
OpenCV::GUI::wait_key

For more samples, see examples/*.rb

Here is a sample face detection program that doesn’t rely on the GUI components. In order for this to work you must copy the OpenCV haarcascades data into a subfolder called data.

#!/usr/bin/env ruby
require "rubygems"
require "opencv"

if ARGV.length < 2
  puts "Usage: your_app_name source dest"
  exit
end

data = "./data/haarcascades/haarcascade_frontalface_alt.xml"
detector = OpenCV::CvHaarClassifierCascade::load(data)
image = OpenCV::IplImage.load(ARGV[0])
detector.detect_objects(image) do |region|
  color = OpenCV::CvColor::Blue
  image.rectangle! region.top_left, region.bottom_right, :color => color
end
image.save_image(ARGV[1])

• OpenCV 2.0 or later. opencv.willowgarage.com/wiki/

• ffcall (optional) www.haible.de/bruno/packages-ffcall.html

The BSD Liscense

see LICENSE.txt