Webcam Face Detection in 16 lines of Javascript

gistfile1.js

var cv = require('opencv')

new cv.VideoCapture(0).read(function(mat){

  mat.resize(200,100)

  mat.detectObject("./data/haarcascade_frontalface_alt.xml", {min : [30,30]}, function(err, faces){  
    for (var i=0;i<faces.length; i++){
      var x = faces[i]
      mat.ellipse(x.x + x.width/2, x.y + x.height/2, x.width/2, x.height/2);
    }
    console.log(faces.length ? (faces.length + " faces found") : "No faces")
    mat.save('./out.jpg');   
    
  })
})