barrier-grid.py

import os
import cv2
import numpy as np
folder = "./cat/"
files = os.listdir(folder)
files.sort( )
dst  = np.ones( (143,143), np.float  )
for i, (f) in enumerate( files ):
    img = cv2.imread(folder + f, cv2.IMREAD_UNCHANGED)
    img = cv2.cvtColor( img, cv2.COLOR_BGR2GRAY  )    
    w = img.shape[1]
    h = img.shape[0]
    for x in range( 0, w, len( files ) ):
        sx = i + x
        dst[ 0:h, sx:sx +1  ] = img[0:h, x:x+1]
cv2.imwrite( 'out.png', dst)