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Mahotas – Image Cropped to bounding box

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  • Last Updated : 16 Sep, 2021

In this article we will see how we can get the image cropped to the bounding box in mahotas. We can get image bounding box with the help of bbox method. In this tutorial we will use “lena” image, below is the command to load it. 

mahotas.demos.load('lena')

Below is the lena image 

In order to do this we will use mahotas.croptobbox method

Syntax : mahotas.croptobbox(img)

Argument : It takes image object as argument

Return : It returns image object

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




# importing required libraries
import mahotas
import mahotas.demos
from pylab import gray, imshow, show
import numpy as np
   
# loading image
img = mahotas.demos.load('lena')
   
# filtering image
img = img.max(2)
 
# otsu method
T_otsu = mahotas.otsu(img)  
   
# image values should be greater than otsu value
img = img > T_otsu
   
print("Image threshold using Otsu Method")
   
# showing image
imshow(img)
show()
   
 
# crop to bbox
new_img = mahotas.croptobbox(img)
 
print("Cropped to bbox Image")
 
# showing image
imshow(new_img)
show()

Output : 

Image threshold using Otsu Method

Cropped to bbox Image

Another example  

Python3




# importing required libraries
import mahotas
import numpy as np
from pylab import gray, imshow, show
import os
  
# loading image
img = mahotas.imread('dog_image.png')
 
 
# filtering image
img = img[:, :, 0]
   
# otsu method
T_otsu = mahotas.otsu(img)  
   
# image values should be greater than otsu value
img = img > T_otsu
   
print("Image threshold using Otsu Method")
   
# showing image
imshow(img)
show()
   
 
# crop to bbox
new_img = mahotas.croptobbox(img)
 
print("Cropped to bbox Image")
 
# showing image
imshow(new_img)
show()

Output : 

Image threshold using Otsu Method

Cropped to bbox Image

 


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