'''
Please write a python code for face detection on a picture using opencv
'''

import cv2

# Load the image
img = cv2.imread('image.jpg')

# Convert the image to grayscale
gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)

# Load the face detection classifier
face_cascade = cv2.CascadeClassifier('haarcascade_frontalface_default.xml')

# Detect faces in the image
faces = face_cascade.detectMultiScale(gray, scaleFactor=1.1, minNeighbors=5, minSize=(30, 30))

# Draw rectangles around the detected faces
for (x, y, w, h) in faces:
    cv2.rectangle(img, (x, y), (x+w, y+h), (0, 255, 0), 2)

# Display the image with the detected faces
cv2.imshow('image', img)
cv2.waitKey(0)
cv2.destroyAllWindows()