Counting Objects

import cv2
import sys
def count_cards(infile="cards.jpg", nogui=False):
    # Read the image
    image = cv2.imread(infile)
    #convert to grayscale
    gray_image = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)
    #blur it
    blurred_image = cv2.GaussianBlur(gray_image, (7,7), 0)
    # Run the Canny edge detector
    canny = cv2.Canny(blurred_image, 30, 100)
    if nogui:
        cv2.imwrite('test_count_cards.png', image2)
        return len(contours)
    else:
        # Show both our images'
        image = cv2.imread(infile)
        cv2.imwrite("output/Original_image.png", image)
        cv2.imwrite("output/Blurred_image.png", blurred_image)
        cv2.imwrite("output/Canny.png", canny)
if __name__ == "__main__":
    count_cards()