ImportError: No module named cv2

import numpy as np

import cv2
from matplotlib import pyplot as plt

img = cv2.imread('1.jpg',0)

orb = cv2.ORB()

kp = orb.detect(img,None)

kp, des = orb.compute(img, kp)


img2 = cv2.drawKeypoints(img,kp,color=(0,255,0), flags=0)
plt.imshow(img2),plt.show()

In here, I have installed numpy and opencv in my windows operating system. But i can’t find out the proper way to add cv2 modu