low pass filter for image analysis
5 vues (au cours des 30 derniers jours)
Afficher commentaires plus anciens
Snowleopard
le 16 Sep 2016
Commenté : Snowleopard
le 24 Sep 2016
I am doing low pass filtering of an image.After applying mask and I need to get filtered image but instead I am getting I6 as attached. I have tried with different mask sizes but still unable to get the same image back with low frequency content. Can you plz check the code and point the mistake in code or methodology.
Thanks in advance,
if true
% code
clc
close all
clear all
I1 = imread('C:\User\Desktop\taken\s3.jpg');
I1 = imresize(I1,[128 128]);
I2 = rgb2gray(I1)
I2=double(I2);
figure, imshow(uint8(I2));
I3=fft2(I2);
I3=fftshift(I3);
figure
I4=log(1+abs(I3));
imshow(mat2gray(I4));
[r,c]=size(I2);
orgr=r/2;
orgc=c/2;
mf= zeros(r,c);
D0= 40;
for i=1:r
for j=1:c
if((i-orgr)^2+(j-orgc)^2)^(0.5)<=D0
mf(i,j)=1;
end
end
end
figure
imshow(uint8(255*mf));
title('frequency domain filter used');
I5=I3*mf;
figure,
I4=log(1+abs(I5));
imshow(mat2gray(I4));
title('filtered image in frequency domain');
I6=ifft2(ifftshift(I5));
figure,
imshow(uint8(abs(I6)));
title('filtered gray scale image');
end
0 commentaires
Réponse acceptée
Jordan Ross
le 23 Sep 2016
Hi,
It seems you have an error in your code. The following line:
I5=I3*mf;
Should be:
I5=I3.*mf;
After making this change I was able to retrieve the image back (see the attached file).
Plus de réponses (0)
Voir également
Catégories
En savoir plus sur Digital Filter Analysis dans Help Center et File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!