# Once spines recognized, how do I find each individual book?

I want to make a system like the Book Spine Recognition on Youtube.

So I read research paper and I built this system.
According this paper, I use Hough transform, then I recognize book boundary like this.

Then I want to separate each of these books. But what next step should I do? Please help me.

import cv2
import numpy as np

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

lines = cv2.HoughLines(edges,1,np.pi/180,200)
print(len(lines)) # 20本
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('output.jpg',img)