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2026-08-07 15:56:42 +09:00
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tomo/+tomo/estimate_reliability_region_grad.m
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% weight_sino = estimate_reliability_region_grad(complex_projection, probe_size, subsample)
% Estimates the good region in the (real) sinogram for alignment and reconstruction.
% The method is base on gradient magnitude of the image
% Written by YJ
function weight_sino = estimate_reliability_region_grad(sinogram, fill, erode_mat)
%{
disp(size(sinogram))
[Gmag,~] = imgradient(gather(sinogram));
sinogram_temp = imfill(Gmag,fill);
level = graythresh(sinogram_temp);
weight_sino_temp = imbinarize(sinogram_temp,level);
weight_sino = imerode(weight_sino_temp,erode_mat);
%}
weight_sino = single(zeros(size(sinogram)));
for i=1:size(sinogram,3)
if ~isreal(sinogram)
[Gmag,~] = imgradient(angle(sinogram(:,:,i)));
else
[Gmag,~] = imgradient(sinogram(:,:,i));
end
sinogram_temp = imfill(Gmag,fill);
level = graythresh(gather(sinogram_temp));
weight_sino_temp = imbinarize(gather(sinogram_temp),level);
weight_sino(:,:,i) = imerode(weight_sino_temp,erode_mat);
end
end