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 librariesimport mahotasimport mahotas.demosfrom pylab import gray, imshow, showimport numpy as np # loading imageimg = mahotas.demos.load('lena') # filtering imageimg = img.max(2)# otsu methodT_otsu = mahotas.otsu(img) # image values should be greater than otsu valueimg = img > T_otsu print("Image threshold using Otsu Method") # showing imageimshow(img)show() # crop to bboxnew_img = mahotas.croptobbox(img)print("Cropped to bbox Image")# showing imageimshow(new_img)show() |
Output :
Image threshold using Otsu Method
Cropped to bbox Image
Another example
Python3
# importing required librariesimport mahotasimport numpy as npfrom pylab import gray, imshow, showimport os # loading imageimg = mahotas.imread('dog_image.png')# filtering imageimg = img[:, :, 0] # otsu methodT_otsu = mahotas.otsu(img) # image values should be greater than otsu valueimg = img > T_otsu print("Image threshold using Otsu Method") # showing imageimshow(img)show() # crop to bboxnew_img = mahotas.croptobbox(img)print("Cropped to bbox Image")# showing imageimshow(new_img)show() |
Output :
Image threshold using Otsu Method
Cropped to bbox Image
