[Python] Cropping with Python and OpenCV to get passport ratio photos

I got the following python code that uses OpenCV to take a given picture and then look for a face and crop that face and save it with the word "Cropped" appended to the file name. Although it's working great, there's two things I cannot seem to figure out how to do.

1. It seems to be cropping very close to the face edges, I'd like to set an offset to convert it so that it fetches a passport like photo from the crop
2. It seems to also add a red border.

Can anyone kindly advise how I can possibly solve these two issues?

Thanks

import cv2

img = cv2.imread('testImage.jpg')
gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
face_cascade = cv2.CascadeClassifier('haarcascade_frontalface_alt.xml')
faces = face_cascade.detectMultiScale(gray, 1.1, 4)

for (x, y, w, h) in faces:
cv2.rectangle(img, (x, y), (x+w, y+h),
(0, 0, 255), 2)

faces = img[y:y + h, x:x + w]
cv2.imwrite('testImage-Cropped.jpg', faces)

cv2.waitKey()

Continue reading...