gistfile1.py

import sys, os
import cv

def detectObject(image):
  size = cv.GetSize(image)
  grayscale = cv.CreateImage(size, 8, 1)
  cv.CvtColor(image, grayscale, cv.CV_BGR2GRAY)
  storage = cv.CreateMemStorage(0)
  cv.EqualizeHist(grayscale, grayscale)
  cascade = cv.Load("haarcascade_frontalface_alt.xml")
  faces = cv.HaarDetectObjects(grayscale, cascade, storage, 1.2, 2,
                              cv.CV_HAAR_DO_CANNY_PRUNING, (100,100))
  print faces

  if faces:
    for i in faces:
      ((x, y, w, h), d) = i
      cv.Rectangle(image, (int(x), int(y)),
                  (int(x+w), int(y+h)),
                  cv.CV_RGB(0,255,0), 3, 8, 0)

def displayObject(image):
  cv.NamedWindow("face", 1)
  cv.ShowImage("face", image)
  cv.WaitKey(0)
  cv.DestroyWindow("face")

def main():
  image = cv.LoadImage("./faces.png")
  detectObject(image)
  displayObject(image)
  cv.SaveImage("face2.png", image)

if __name__ == "__main__":
  main()