nine point smooth in OpenCV

Question

How can i apply nine point smooth using OpenCV?

Info : Nine point smooth will take a 3x3 square of 9 pixels each and determine the count of each pixel.The counts per pixel are then averaged, and that value is assigned to the central pixel.

Nine Point Smooth : http://www.people.vcu.edu/~mhcrosthwait/clrs322/2DFilteringconcepts.htm

Answer 1

From the docs mentioned in the comments: https://docs.opencv.org/3.1.0/d4/d13/tutorial_py_filtering.html. It would be:

import cv2
import numpy as np

img = cv2.imread('opencv_logo.png')

blur = cv2.blur(img,(3,3))

Or slightly more manually:

kernel = np.ones((3,3), np.float32)/9
dst = cv2.filter2D(img,-1,kernel)