Refactoring Matlab FDK and FBP

* Moved transposing projections into filtering
CERN · Feb 1, 2023 · b1f31ea · b1f31ea
1 parent c27faf6
commit b1f31ea
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Showing 3 changed files with 5 additions and 6 deletions.
diff --git a/MATLAB/Algorithms/FBP.m b/MATLAB/Algorithms/FBP.m
@@ -43,7 +43,6 @@
 
 %% Weight
 %proj=data
-proj=permute(proj,[2 1 3]);
 
 %% filter
 proj_filt = filtering(proj,geo,angles,parker); % Not sure if offsets are good in here

diff --git a/MATLAB/Algorithms/FDK.m b/MATLAB/Algorithms/FDK.m
@@ -59,9 +59,7 @@
 end
 
 %% Weight
-proj=permute(proj,[2 1 3]);
 for ii=1:size(angles,2)
-
     us = ((-geo.nDetector(1)/2+0.5):1:(geo.nDetector(1)/2-0.5))*geo.dDetector(1) + offset(1,ii);
     vs = ((-geo.nDetector(2)/2+0.5):1:(geo.nDetector(2)/2-0.5))*geo.dDetector(2) + offset(2,ii);
     [uu,vv] = meshgrid(us,vs); % detector
@@ -70,10 +68,10 @@
     w = (geo.DSD(ii))./sqrt((geo.DSD(ii))^2+uu.^2 + vv.^2);
 
     % Multiply the weights with projection data
-    proj(:,:,ii) = proj(:,:,ii).*w';
+    proj(:,:,ii) = w.*proj(:,:,ii);
 end
 %% Fourier transform based filtering
-proj = filtering(proj,geo,angles,parker, 'usegpufft', usegpufft, 'gpuids', gpuids); % Not sure if offsets are good in here
+proj = filtering(proj,geo,angles,parker); % Not sure if offsets are good in here
 
 % RMFIELD Remove fields from a structure array.
 geo=rmfield(geo,'filter');

diff --git a/MATLAB/Utilities/filtering.m b/MATLAB/Utilities/filtering.m
@@ -22,7 +22,7 @@
 [usegpufft,gpuids]=parse_inputs(varargin);
 
 if parker
-	proj = permute(ParkerWeight(permute(proj,[2 1 3]),geo,angles,parker),[2 1 3]);
+	proj = ParkerWeight(proj,geo,angles,parker);
 	diff_angles = diff(angles(1,:)); angle_step = mean(abs(diff_angles)); % to be used later
 end 
 
@@ -37,6 +37,8 @@
     filt = repmat(filt',[1 geo.nDetector(2)]);
 end
 
+proj=permute(proj,[2 1 3]);
+
 if usegpufft==2
     bundle_size = 32;  %len(gpuids)
     n_bundles = floor((size(angles,2)+bundle_size-1)/bundle_size);