convolution of two image in frequency domain?
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TULIKA
am 23 Aug. 2014
Kommentiert: Image Analyst
am 13 Dez. 2021
x= 1:150;y=1:150;
[p,q]=freqspace(150);
[X,Y]=meshgrid(p,q);
R=(X.^2 + Y.^2);
Lambda=633*10^-9;
dis=10*10^-3;
F = (exp(i.*pi.*R))./(Lambda.*dis);
kernel = imag(F); % Gray scale image = imaginary part.
mesh(kernel);
axis square
imshow(kernel, []);
axis on;
colormap(gray(256));
rgbImage = imread('image.jpg');
imshow(rgbImage);
axis on;
% R=rgbImage(:,:,1);
% G=rgbImage(:,:,2);
% B=rgbImage(:,:,3);
grayImage = rgb2gray(rgbImage);
imshow(grayImage, []);
axis on;
grayImage1=fft2(double(grayImage));
kernel1=fft2(kernel);
Imagef=kernel*grayImage1;
Imagefinal=ifft2(Imagef);
imshow(Imagefinal, []);
axis on;
This code has no errors. Its output should be like a hazy image of concentrating circle or may be overlapped, but it shows hazy straight line. Please help.
2 Kommentare
Linas Svilainis
am 13 Dez. 2021
Are you sure this code has no erros? kernel1=fft2(kernel);
BUT
Imagef=kernel*grayImage1;
NOT kernel1?
Why * not .*?
Image Analyst
am 13 Dez. 2021
@Linas Svilainis I think they meant to say "This code has errors." The problem is to multiply the spectrum of a kernel times a spectrum of a filter, you'd need to use .* (dot star) instead of *, and you'd need to make sure they both have the same size (number of pixels).
Akzeptierte Antwort
Image Analyst
am 23 Aug. 2014
See my demos, attached. They're good examples that show you how it's done. Once you understand and run those I have no doubt you will be able to do the same thing with your image and kernel.
13 Kommentare
Image Analyst
am 25 Aug. 2014
This is one situation where clear all is good. See how you were able to display image4? But you never defined image4, so where did that image4 come from? Not from this running of the program. It must have existed already. Who knows how many other times this happened with other variables. Either call clear all or put it in the front of your script.
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