Opencv example

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 )

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])