import cv2
import numpy as np

img = cv2.imread('index.jpg')
print(img.shape)
gray = cv2.cvtColor(img,cv2.COLOR_BGR2GRAY)
edges = cv2.Canny(gray,50,150,apertureSize = 3)
cv2.imwrite('test1.jpg', edges)
print(edges.shape)
lines = cv2.HoughLines(edges,1,np.pi/180,160)
print(lines.shape)
for rho,theta in lines[:, 0]:
    a = np.cos(theta)
    b = np.sin(theta)
    x0 = a*rho
    y0 = b*rho
    x1 = int(x0 + 1000*(-b))
    y1 = int(y0 + 1000*(a))
    x2 = int(x0 - 1000*(-b))
    y2 = int(y0 - 1000*(a))

    cv2.line(img,(x1,y1),(x2,y2),(0,0,255),2)

cv2.imwrite('houghlines3.jpg',img)