# Mahotas – Roundness of Image

In this article we will see how we can get the image roundness feature in mahotas. Roundness is dominated by the shape’s gross features rather than the definition of its edges and corners, or the surface roughness of a manufactured object. A smooth ellipse can have low roundness, if its eccentricity is large

For this tutorial we will use ‘lena’ image, below is the command to load the lena image

`mahotas.demos.load('lena')`

Below is the lena image

In order to do this we will use ` mahotas.features.roundness` method

Syntax : mahotas.features.roundness(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

 `# importing required libraries ` `import` `mahotas ` `import` `mahotas.demos ` `from` `pylab ``import` `gray, imshow, show ` `import` `numpy as np ` `import` `matplotlib.pyplot as plt ` `   `  `# loading iamge ` `img ``=` `mahotas.demos.load(``'lena'``) ` `   `  `# filtering image ` `img ``=` `img.``max``(``2``) ` ` `  `print``(``"Image"``) ` `   `  `# showing image ` `imshow(img) ` `show() ` ` `  `# computing roundness in image ` `value ``=` `mahotas.features.roundness(img) ` `  `  ` `  `# printing value ` `print``(``"Roundness : "` `+` `str``(value)) `

Output :

`Image`

`Roundness : 0.0`

Another example

 `# importing required libraries ` `import` `mahotas ` `import` `numpy as np ` `from` `pylab ``import` `gray, imshow, show ` `import` `os ` `import` `matplotlib.pyplot as plt ` `  `  `# loading iamge ` `img ``=` `mahotas.imread(``'dog_image.png'``) ` ` `  ` `  `# fltering image ` `img ``=` `img[:, :, ``0``] ` `   `  `print``(``"Image"``) ` `   `  `# showing image ` `imshow(img) ` `show() ` ` `  `# computing roundness in image ` `value ``=` `mahotas.features.roundness(img) ` `  `  ` `  `# printing value ` `print``(``"Roundness : "` `+` `str``(value)) `

Output :

`Image`

`Roundness : 0.04297201733896709`

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