import numpy as np
import argparse
import glob
import cv2
def auto_canny(image, sigma=0.33):

	v = np.median(image)

	lower = int(max(0, (1.0 - sigma) * v))
	upper = int(min(255, (1.0 + sigma) *v))
	edged = cv2.Canny(image, lower, upper)


	return edged

# construct the argument parse and parse the arguments
ap = argparse.ArgumentParser()
ap.add_argument("-i", "--images", required=True,
	help="path to input dataset of images")
args = vars(ap.parse_args())
# loop over the images
for imagePath in glob.glob(args["images"] + "/*.jpg"):
	
	image = cv2.imread(imagePath)
	gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)
	blurred = cv2.GaussianBlur(gray, (3, 3), 0)
	
	wide = cv2.Canny(blurred, 10, 200)
	tight = cv2.Canny(blurred, 225, 250)
	auto = auto_canny(blurred)
	
	cv2.imshow("Original", image)
	cv2.imshow("Edges", np.hstack([wide, tight, auto]))
	cv2.waitKey(0)