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That is wrong argument in cv2.imread.

imagePath = sys.argv[1] classifier = cv2.CascadeClassifier ("haarcascade_frontalface_default.xml") image = cv2.imread(imagePath)

Change scaleFactor=1.1 to scaleFactor=1.2

That is wrong argument in cv2.imread.

imagePath = sys.argv[1]
classifier = cv2.CascadeClassifier ("haarcascade_frontalface_default.xml")
image = cv2.imread(imagePath)     
cv2.imread(imagePath)