在图像上写字

text2 = "{}: {:.2f}".format(text, fm)
cv2.putText(image, text2, (10, 30),    cv2.FONT_HERSHEY_SIMPLEX, 0.8, (0, 0, 255), 3)

https://www.pyimagesearch.com/2015/09/07/blur-detection-with-opencv/