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
clcclose allclear allI1 = 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);figureI4=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 endendfigureimshow(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
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