Mahotas – Image Cropped to bounding box

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

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# importing required libraries
import mahotas
import mahotas.demos
from pylab import gray, imshow, show
import numpy as np
    
# loading iamge
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 Mehtod")
    
# showing image
imshow(img)
show()
    
  
# crop to bbox
new_img = mahotas.croptobbox(img)
  
print("Cropped to bbox Image")
  
# showing image
imshow(new_img)
show()

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Output :

Image threshold using Otsu Mehtod

Cropped to bbox Image

Another example

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# importing required libraries
import mahotas
import numpy as np
from pylab import gray, imshow, show
import os
   
# loading iamge
img = mahotas.imread('dog_image.png')
  
  
# fltering 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 Mehtod")
    
# showing image
imshow(img)
show()
    
  
# crop to bbox
new_img = mahotas.croptobbox(img)
  
print("Cropped to bbox Image")
  
# showing image
imshow(new_img)
show()

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Output :

Image threshold using Otsu Mehtod

Cropped to bbox Image

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