import cv2
import numpy as np
from matplotlib import pyplot as plt

img = cv2.imread('images/watch.jpg',cv2.IMREAD_GRAYSCALE)
##cv2.imshow('image',img)
##cv2.waitKey(0)
##cv2.destroyAllWindows()

plt.imshow(img, cmap='gray', interpolation='bicubic')
plt.plot([50,100],[80,100], 'c', linewidth=5)
plt.show()