

In [10]:

    
import skimage as skm
import skimage.io as io
from skimage.filters import sobel 
import numpy as np
import matplotlib.pyplot as plt

%matplotlib inline

Import image



In [20]:

    
im=io.imread('mini-pizza.jpg')
gim=skm.color.rgb2gray(im)
io.imshow(gim)









    Out[20]:





<matplotlib.image.AxesImage at 0x7fbf937e2668>

Create elevation map



In [21]:

    
elevation_map=sobel(gim)
io.imshow(elevation_map)









    Out[21]:





<matplotlib.image.AxesImage at 0x7fbfa4027ac8>

Find background threshold



In [27]:

    
hist = np.histogram(gim, bins=np.arange(0, 256))
plt.plot(hist[1][:-1], hist[0], lw=2)









    Out[27]:





[<matplotlib.lines.Line2D at 0x7fbfac224eb8>]



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