[PYTHON] Play with demons because it's setsubun

Introduction

I'm afraid of demons, so I will repel them with a script.

What i did

I will neutralize the scary demon (image below).

(Source: Irasutoya "https://www.irasutoya.com/2020/01/blog-post_891.html")

It's a scary demon.

First, grayscale it. Maybe I'm even more scared.

Use the polarization of Otsu. At this point the demon seems weak.

Fine lines with Zhang-Suen's algorithm. I'm happy to be able to write in one line. Maybe it's okay to be attacked.

Below is the code I used.

oni-taizi.rb

from skimage.morphology import skeletonize
import cv2
import numpy as np

#Read
img = cv2.imread('setsubun_oni_kowai.png')

#Convert to grayscale
gray = cv2.cvtColor(img, cv2.COLOR_RGB2GRAY)

#Polarization of Otsu
ret, th = cv2.threshold(gray, 0, 255, cv2.THRESH_OTSU)

#Image 0,Convert to 1
th[th>0]=1    

#Thinning
skeleton = skeletonize(th)

#Image 0,Convert to 255
output = np.where(skeleton, 0, 255)

#Save
cv2.imwrite("oni.png ", output)

in conclusion

Whether or not you were able to get rid of it depends on your personal subjectivity. Thank you for visiting.