March Madness Challenge - MMC11

The problem from yesterdays post was that it is using multiplication. I replaced the Laplace filter with a Rank filter. The result is much better and the program runs 40 seconds instead of 5 Minutes. See yourself...



The result looks like this. The result of displaying the edges is much better.

#! /usr/bin/python

from PIL import Image
from numpy import matrix

import matplotlib.pyplot as plt
import sys
import os
import shutil

outfile = os.path.splitext(sys.argv[1])[0] + 'Rank.jpg'
shutil.copy(sys.argv[1], outfile)

img = Image.open(sys.argv[1])
pix = img.load()

width = img.size[0]
height = img.size[1]

width -= 1
height -= 1

out = Image.open(outfile)
outpix = out.load()

# loop thru image
for x in range(1,width,1):
        for y in range(1,height,1):
                # do calculation
                pixellist = []
                for mx in range(-1,2,1):
                        for my in range(-1,2,1):
                                if mx!=0 and my!=0:
                                        pixellist.append(pix[x+mx,y+my])
                pixellist.sort()
                val = pixellist[len(pixellist)-1]-pixellist[0]
                if val > 255:
                        val = 255
                if val < 0:
                        val = 0

                outpix[x,y] = val

out.show()
out.save(outfile, 'JPEG')