Mahotas – Eccentricity of Image
Last Updated :
02 Sep, 2021
In this article we will see how we can get the eccentricity of the image in mahotas. Eccentricity measures the shortest length of the paths from a given vertex v to reach any other vertex w of a connected graph. Computed for every vertex v it transforms the connectivity structure of the graph into a set of values. For a connected region of a digital image it is defined through its neighbourhood graph and the given metric.
mahotas.demos.load('lena')
Below is the lena image
In order to do this we will use mahotas.features.eccentricity( method
Syntax : mahotas.features.eccentricity(img)
Argument : It takes image object as argument
Return : It returns float value
Note : Input image should be filtered or should be loaded as grey
In order to filter the image we will take the image object which is numpy.ndarray and filter it with the help of indexing, below is the command to do this
image = image[:, :, 0]
Below is the implementation
Python3
import mahotas
import mahotas.demos
from pylab import gray, imshow, show
import numpy as np
import matplotlib.pyplot as plt
img = mahotas.demos.load( 'lena' )
img = img. max ( 2 )
print ( "Image" )
imshow(img)
show()
value = mahotas.features.eccentricity(img)
print ( "Eccentricity value = " + str (value))
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Output :
Image
Eccentricity value = 0.0
Another example
Python3
import mahotas
import numpy as np
from pylab import gray, imshow, show
import os
import matplotlib.pyplot as plt
img = mahotas.imread( 'dog_image.png' )
img = img[:, :, 0 ]
print ( "Image" )
imshow(img)
show()
value = mahotas.features.eccentricity(img)
print ( "Eccentricity value = " + str (value))
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Output :
Image
Eccentricity value = 0.7950893156644899
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