import cv2
import numpy as np

img = cv2.imread('houghlines5.jpg')
gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
edges = cv2.Canny(gray, 50, 120)
minLineLength = 20
maxLineGap = 4
lines = cv2.HoughLinesP(edges, 1, np.pi/180, 100, minLineLength, maxLineGap)
print lines[0]
print lines[0]
for i in xrange(len(lines)):
    x1, y1, x2, y2 = lines[i][0]
    cv2.line(img, (x1, y1), (x2, y2), (0, 255, 0), 2)

cv2.imshow("edges", edges)
cv2.imshow("lines", img)
cv2.waitKey()
cv2.destroyAllWindows()
