In this article we will see how we can apply image overlay in mahotas. Image overlay in mahotas create an image which is grayscale, but with possible boolean overlays.
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.overlay method
Syntax : mahotas.overlay(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
# importing required libraries import mahotas
import mahotas.demos
from pylab import gray, imshow, show
import numpy as np
import matplotlib.pyplot as plt
# loading image img = mahotas.demos.load( 'lena' )
# filtering image img = img. max ( 2 )
print ( "Image" )
# showing image imshow(img) show() # Overlay method new_img = mahotas.overlay(img)
# showing image print ( "Overlay Image" )
imshow(new_img) show() |
Output :
Image
Overlay Image
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 image img = mahotas.imread( 'dog_image.png' )
# filtering image img = img[:, :, 0 ]
print ( "Image" )
# showing image imshow(img) show() # Overlay method new_img = mahotas.overlay(img)
# showing image print ( "Overlay Image" )
imshow(new_img) show() |
Output :
Image
Overlay Image