Face detection can be achieved using Haar wavelets. The code below detects a face from an image using haar wavelets:
Python code OpenCV Face detection
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import numpy as np
import cv2
face_cascade = cv2.CascadeClassifier('haarcascade_frontalface_default.xml')
img = cv2.imread('face.jpg')
gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
roi_color = img
faces = face_cascade.detectMultiScale(gray, 1.3, 5)
for (x,y,w,h) in faces:
cv2.rectangle(img,(x,y),(x+w,y+h),(255,0,0),2)
print str(x) + " " + str(y) + " " + str(w) + " " + str(h)
cv2.imshow('img',img)
cv2.waitKey(0)
cv2.destroyAllWindows()
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Output:
Face detection