cannot locate haarcascade default frontal face XML file on windows
<p>I am new to image processing and i've been getting my hands dirty with opencv for python for past few weeks. Today I tried to use the default haarcascade XML file for the face detection. Here is my code:</p>

<pre><code>import cv2
import numpy as np

front_cascade = cv2.CascadeClassifier('haarcascade_frontalface_default.xml')

img = cv2.imread('lena.jpg')
gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)

faces = front_cascade.detectMultiScale(gray, 1.3, 6)
#for (x, y, w, h) in faces:
#    cv2.rectangle(img, (x, y), (x + w, y + h), (0, 255, 155), 3)

print faces

cv2.imshow('frame', img)
cv2.waitKey(0)
cv2.destroyAllWindows()
</code></pre>

<p>Problem here is that it prints out an empty set. And to my surprise when I change the name of the XML file to something like 'aaa.xml', it still produces the same output. Any help would be highly appreciated.</p>