how to process image with opencv in python?

Question

I want to use edge detection algorithms from opencv library. Here is a piece of python code:

from opencv.cv import *
from opencv.highgui import *

img = cvLoadIm         


        

Answer 1

You can convert an image to grayscale in a single step instead of two:

gray = cv.CreateMat(img.height, img.width, cv.CV_8UC1)
cv.CvtColor(img, gray, cv.CV_BGR2GRAY)