fastNlMeansDenoising

import numpy as np
import cv2


windowname = 'img'
cv2.namedWindow(windowname)

windowname2 = 'denoised'
cv2.namedWindow(windowname2)


img = cv2.imread('original.jpg')

dst = cv2.fastNlMeansDenoising(img,None,3,7,21)

while(1):
    key = cv2.waitKey(5)
    if key == 27:
        break
    cv2.imshow(windowname,img)
    cv2.imshow(windowname2,dst)