How do I make atrifacts for a synthetic image?
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Hello to everyone, could anybody help me making artifacts for a synthetic image?
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Image Analyst
2011-7-10
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Jan
2011-7-11
This is an adequate answer. Neither "artifact" nor "synthetic image" is well defined, such that an answer can be pure guessing only. Please, Mary, explain all needed details.
Sean de Wolski
2011-7-11
Ring artifacts and reconstruction artifacts for a parallel beam configuration:
I = imread('cameraman.tif');
theta = 0:.1:180; %make a bigger increment to add more reconstruction noise (e.g. 0:5:180);
S = radon(I,theta);
n = 5; %num rings
r = floor(rand(n,1)*size(S,1));
r2 = min(r+floor(rand(n,1)*8),size(S,1)); %max ring thickness is 8
for ii = 1:n
S(r(ii):r2(ii),:) = bsxfun(@minus,S(r(ii):r2(ii),:),.4*range(S(r(ii):r2(ii),:),2));
end
I2 = uint8(iradon(S,theta));
imshow(I2)
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