import cv2.cv as cv
 
im = cv.LoadImage("img/lena.jpg")
 
for i in range(im.height):
 for j in range(im.width):
  im[i,j] # 这里可以处理每个像素点

import cv2.cv as cv
 
im = cv.LoadImage("img/lena.jpg")
li = cv.InitLineIterator(im, (0, 0), (im.rows, im.cols)) #So loop the entire matrix
 
for (r, g, b) in li:
 # 这里可以对每个像素点的 r g b 进行处理

import cv2.cv as cv
 
import random
 
# 这里也可以使用 Get2D/Set2D 来加载图片
im = cv.LoadImage("img/lena.jpg") 
 
for k in range(5000): #Create 5000 noisy pixels
 i = random.randint(0,im.height-1)
 j = random.randint(0,im.width-1)
 color = (random.randrange(256),random.randrange(256),random.randrange(256))
 im[i,j] = color
 
cv.ShowImage("Noize", im)
cv.WaitKey(0)