In this article we will see how we can find local maxima of the image in mahotas. Local maxima is basically local peaks in the image. 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.locmax method
Syntax : mahotas.locmax(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 npimport matplotlib.pyplot as plt # loading imageimg = mahotas.demos.load('lena') # filtering imageimg = img.max(2)print("Image") # showing imageimshow(img)show()# getting local maxima of the imagenew_img = mahotas.locmax(img) # showing imageprint("Local Maxima")imshow(new_img)show() |
Output :
Image
Local Maxima
Another example
Python3
# importing required librariesimport mahotasimport numpy as npfrom pylab import gray, imshow, showimport osimport matplotlib.pyplot as plt # loading imageimg = mahotas.imread('dog_image.png')# filtering imageimg = img[:, :, 0] print("Image") # showing imageimshow(img)show()# getting local maxima of the imagenew_img = mahotas.locmax(img) # showing imageprint("Local Maxima")imshow(new_img)show() |
Output :
Image
Local Maxima
