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30 lines
1.1 KiB
Matlab
30 lines
1.1 KiB
Matlab
% weight_sino = estimate_reliability_region_grad(complex_projection, probe_size, subsample)
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% Estimates the good region in the (real) sinogram for alignment and reconstruction.
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% The method is base on gradient magnitude of the image
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% Written by YJ
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function weight_sino = estimate_reliability_region_grad(sinogram, fill, erode_mat)
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%{
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disp(size(sinogram))
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[Gmag,~] = imgradient(gather(sinogram));
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sinogram_temp = imfill(Gmag,fill);
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level = graythresh(sinogram_temp);
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weight_sino_temp = imbinarize(sinogram_temp,level);
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weight_sino = imerode(weight_sino_temp,erode_mat);
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%}
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weight_sino = single(zeros(size(sinogram)));
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for i=1:size(sinogram,3)
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if ~isreal(sinogram)
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[Gmag,~] = imgradient(angle(sinogram(:,:,i)));
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else
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[Gmag,~] = imgradient(sinogram(:,:,i));
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end
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sinogram_temp = imfill(Gmag,fill);
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level = graythresh(gather(sinogram_temp));
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weight_sino_temp = imbinarize(gather(sinogram_temp),level);
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weight_sino(:,:,i) = imerode(weight_sino_temp,erode_mat);
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end
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end
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