Remove artefact using fourier filter

2 次查看（过去 30 天）
shubham kumar gupta
回答： Image Analyst 2022-9-8
I have a coin image where mid portion became dark after processing of the data, now i am trying fourier filter to remove artefact, but ig i'm not able to correctly remove artefacts.
My attempt:
function img_back=fftSaft(maxarray)
figure(1);
subplot(2,2,1);
%maxarray=medfilt2(maxarray,[2 2]);
maxarray=imgaussfilt(maxarray,0.8);
maxarray=imsharpen(maxarray);
imshow(maxarray,[]);
af=fftshift(fft2(maxarray));
subplot(2,2,2);
mag=20*log(abs(af));
imshow(mag,[]);
rows=size(maxarray,1); cols = size(maxarray,2);
crow=floor(rows/2);ccol = floor(cols/2);
%af(crow-0.5:crow+0.5, 1:ccol-5) = 0;
%af(crow-0.5:crow+0.5, ccol+6:end) = 0;
af(af>60 & af<150)=0;
subplot(2,2,3);
magnitude_spectrum_no_vertical = 20*log(abs(af));
imshow(magnitude_spectrum_no_vertical,[]);
iaf=ifftshift(af);
img_back=ifft2(iaf);
img_back=real(img_back);
img_back=imsharpen(img_back);
subplot(2,2,4);
imshow(img_back,[]);
end

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回答（1 个）

Image Analyst
Image Analyst 2022-9-8
Where exactly is the artifact in that image?
I don't know that Fourier filtering could get rid of an artifact such as darkening. You should figure out why your processing made the middle darker in the first place.
If you have any more questions, then attach your original image and code to read it in with the paperclip icon after you read this:
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