How to use the OTSU Threshold in opencv?

Question

I was using a fixed threshold but turns out that it\'s not so good for me. Then, someone told me about the otsu threshold. How can I use it in my code? I read about it and I

Answer 1

In python it is simple

import cv2

img = cv2.imread('img.jpg',0)  #pass 0 to convert into gray level 
ret,thr = cv2.threshold(img, 0, 255, cv2.THRESH_OTSU)
cv2.imshow('win1', thr)
cv2.waitKey(0)  
cv2.destroyAllWindows()