You have to open it if you want to see the details!
I applied a Threshold of 30, so you be able to see a little bit more.
1 #! /usr/bin/python
2
3 from PIL import Image
4 from numpy import matrix
5
6 import matplotlib.pyplot as plt
7 import sys
8 import os
9 import shutil
10
11 outfile = os.path.splitext(sys.argv[1])[0] + 'Laplace.jpg'
12 shutil.copy(sys.argv[1], outfile)
13
14 # Laplace Filter
15 lp = matrix([[0,-1,0],[-1,4,-1],[0,-1,0]])
16
17 # Hot Spot
18 hs = matrix([[0,0,0],[0,0,0],[0,0,0]])
19
20 img = Image.open(sys.argv[1])
21 pix = img.load()
22
23 width = img.size[0]
24 height = img.size[1]
25
26 width -= 1
27 height -= 1
28
29 out = Image.open(outfile)
30 outpix = out.load()
31
32 # loop thru image
33 foor x in range(1,width,1):
34 for y in range(1,height,1):
35 # do calculation
36 sum = 0
37 for mx in range(-1,2,1):
38 for my in range(-1,2,1):
39 sum += pix[x+mx,y+my]*lp[mx+1,my+1]
40 if sum > 255:
41 sum = 255
42 if sum < 0:
43 sum = 0
44 # if sum > 30:
45 # sum = 255
46
47 outpix[x,y] = sum
48
49 #out.show()
50 out.save(outfile, 'JPEG')
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