Mahotas - Removing border effect from Wavelet Center Image

In this article we will see how we can remove the border effect from wavelet center in mahotas. Wavelets represent the scale of features in an image, as well as their position. Wavelet center will make the image small and place it in the center unlike daubechies wavelet. We use wavelet_center method to wavelet center the image.

In this tutorial we will use “luispedro” image, below is the command to load it.

mahotas.demos.load('luispedro')

Below is the luispedro image

In order to do this we will use wavelet_decenter method

Syntax : mahotas.wavelet_decenter(centered_image, original_img_shape)

Argument : It takes image object and original image shape 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]

Example 1:

# importing various libraries 
import numpy as np 
import mahotas 
import mahotas.demos 
from mahotas.thresholding import soft_threshold 
from pylab import imshow, show 
from os import path 
  
# loading image 
f = mahotas.demos.load('luispedro', as_grey = True) 
  
  
# making image wavelet center 
fc = mahotas.wavelet_center(f) 
  
# showing image 
print("Image with wavelet center") 
imshow(fc) 
show() 
  
# restoring image 
rd = mahotas.wavelet_decenter(fc, f.shape) 
  
  
# showing image 
print("Restored Image") 
imshow(rd) 
show() 

Output :

Example 2:

# importing required libraries 
import mahotas 
import numpy as np 
from pylab import imshow, show 
import os 
  
  
# loading iamge 
img = mahotas.imread('dog_image.png') 
  
# filtering iamge 
img = img[:, :, 0] 
  
  
# making image wavelet center 
fc = mahotas.wavelet_center(img) 
  
# showing image 
print("Image with wavelet center") 
imshow(fc) 
show() 
  
# restoring image 
rd = mahotas.wavelet_decenter(fc, img.shape) 
  
  
# showing image 
print("Restored Image") 
imshow(rd) 
show() 

Output :

My Personal Notes

Mahotas – Removing border effect from Wavelet Center Image

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