OpenCV & Python: Simple Image Operations

Here's a short example showing how to use openCV with Python.It reads an image from a file, displays the image, the Harris corner detector on that image and the Canny edge image:
(save this in a file named tmp.py and run with: python tmp.py )



http://pythonimage.blogspot.com/2009/04/opencv-example.html

---

import Image
import os
import sys
from opencv.cv import *
from opencv.highgui import *

def analyzeImage(f,name):

  im=Image.open(f)
  try:
    if(im.size[0]==1 or im.size[1]==1):
      return

    print (name+' : '+str(im.size[0])+','+ str(im.size[1]))
    le=1
    if(type(im.getpixel((0,0)))==type((1,2))):
      le=len(im.getpixel((0,0)))

    gray = cvCreateImage (cvSize (im.size[0], im.size[1]), 8, 1)
    edge1 = cvCreateImage (cvSize (im.size[0], im.size[1]), 32, 1)
    edge2 = cvCreateImage (cvSize (im.size[0], im.size[1]), 8, 1)
    edge3 = cvCreateImage (cvSize (im.size[0], im.size[1]), 32, 3)

    for h in range(im.size[1]):
      for w in range(im.size[0]):
        p=im.getpixel((w,h))
        if(type(p)==type(1)):
          gray[h][w] = im.getpixel((w,h))
        else:
          gray[h][w] = im.getpixel((w,h))[0]

    cvCornerHarris(gray,edge1,5,5,0.1)
    cvCanny(gray,edge2,20,100)

    cvNamedWindow("win")
    cvShowImage("win", gray);
    cvNamedWindow("win2")
    cvShowImage("win2", edge1);
    cvNamedWindow("win3")
    cvShowImage("win3", edge2);

    cvWaitKey()

    f.close()

  except Exception,e:
    print e
    print 'ERROR: problem handling '+ name


f = open(sys.argv[1],'r')
analyzeImage(f,sys.argv[1])