Complete example of using OpenCV Haar Face Detection on Native Client
In this example, the ported OpenCV library is used to detect the face in an image provided by the Javascript. To run this example, your Native Client environment needs to have OpenCV installed.
The detailed instructions to install OpenCV 2.4.2 for Native Client is at http://metacaptcha.com/install_opencv_nacl
More information about this example is at http://metacaptcha.com/example_opencv_nacl_facedetect