import cv2
import numpy as np

def draw_random_lines(img, w, n):
    for i in range(n):
        point1 = (np.random.randint(low = 0, high = w), np.random.randint(low = 0, high = w))
        point2 = (np.random.randint(low = 0, high = w), np.random.randint(low = 0, high = w))
        cv2.line(img,point1,point2,(255,0,0),5)
    x = y = 0
    while(y<w):
        while(x<w):
            if(np.any(img[x, y] != 0)):
                if(np.random.randint(low=0, high=100) < 60):
                    img[x, y] = [255, 255, 255]
                else:
                    img[x, y] = [0, 0, 0]
            else:
                if(np.random.randint(low=0, high=100) < 95):
                    img[x, y] = [255, 255, 255]
                else:
                    img[x, y] = [0, 0, 0]
            x+=1
        x=0
        y+=1
    return img

w = 512
img = np.zeros((w,w,3), np.uint8)
img = draw_random_lines(img, w, 5)
cv2.imshow("Original", img)
cv2.imwrite("alo.png", img)
img = cv2.imread("alo.png")

gray = cv2.cvtColor(img,cv2.COLOR_BGR2GRAY)
edges = cv2.Canny(gray,50,150,apertureSize = 3)

lines = cv2.HoughLines(edges,1,np.pi/180,200)
for line in lines:
    for rho,theta in line:
        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.imshow("Detectada", img)

cv2.waitKey(0)