initial commit

2026-09-18 00:09:10 +09:00 · 2026-08-07 15:56:42 +09:00
commit 91ad25aca9
1012 changed files with 159314 additions and 0 deletions
@@ -0,0 +1,146 @@
+function [mask] = get_tomo_fourier_mask_2d( Nproj , N_recon, angles )
+%Get fourier mask of the MISSING WEDGE
+
+%Output Image Size
+Ny = N_recon(1);
+Nx = N_recon(2);
+
+cen_y = floor(Ny/2)+1;
+cen_x = floor(Nx/2)+1;
+
+dk_y = 1/Ny;
+dk_x = 1/Nx;
+Nang = length(angles);
+x = (linspace(1,Nproj,Nproj)-cen_x)*dk_x;
+x = repmat(x,[Nang,1]);
+y = 0;
+angles_temp = reshape(angles,[Nang,1]);
+angles_temp = repmat(angles_temp,[1,Nproj]);
+angles_temp = -angles_temp*pi/180;
+y_new = cos(angles_temp)*y + sin(angles_temp).*x;
+x_new = -sin(angles_temp)*y + cos(angles_temp).*x;         
+
+mask = zeros(Ny, Nx, 4);
+
+%1
+p_y = floor(y_new/dk_y)+cen_y;
+p_x = floor(x_new/dk_x)+cen_x;
+mask_temp = zeros([Ny*Nx,1]);
+mask_temp(p_y+(p_x-1)*Ny)=1;
+mask(:,:,1) = reshape(mask_temp,[Ny,Nx]);
+
+%2
+p_y = ceil(y_new/dk_y)+cen_y;
+p_x = floor(x_new/dk_x)+cen_x;
+mask_temp = zeros([Ny*Nx,1]);
+mask_temp(p_y+(p_x-1)*Ny)=1;
+mask(:,:,2) = reshape(mask_temp,[Ny,Nx]);
+
+%3
+p_y = floor(y_new/dk_y)+cen_y;
+p_x = ceil(x_new/dk_x)+cen_x;
+mask_temp = zeros([Ny*Nx,1]);
+mask_temp(p_y+(p_x-1)*Ny)=1;
+mask(:,:,3) = reshape(mask_temp,[Ny,Nx]);
+
+%4
+p_y = ceil(y_new/dk_y)+cen_y;
+p_x = ceil(x_new/dk_x)+cen_x;
+mask_temp = zeros([Ny*Nx,1]);
+mask_temp(p_y+(p_x-1)*Ny)=1;
+mask(:,:,4) = reshape(mask_temp,[Ny,Nx]);
+
+mask = sum(mask,3);
+mask = mask==0;
+% always set center to 1
+%mask(cen_y,cen_x) = 1;
+        
+%{
+%Number of projections
+N_ang = max(size(angles));
+
+%Output Image Size
+Ny = N_recon(1);
+Nx = N_recon(2);
+
+cen_y = floor(Ny/2)+1;
+cen_x = floor(Nx/2)+1;
+    
+mask = zeros(Ny, Nx);
+
+
+dk_y = 1/Ny;
+dk_x = 1/Nx;
+
+for a = 1:N_ang
+    %if angles(a)~=0 || angles(a)~=90
+    ang = -angles(a)*pi/180;
+
+    %CurrentcN_recon projection
+    %p = input(:,a);
+    %P = fftshift(fft(ifftshift(p)));
+    %{
+    if -angles(a) == 90        
+        v(:,cen) = v(:,cen) + P(end:-1:1);
+
+        w(:,cen) = w(:,cen) + 1;
+
+        output_F(w~=0) = v(w~=0)./w(w~=0);
+    elseif -angles(a) == -90     
+        v(:,cen) = v(:,cen) + P;
+        w(:,cen) = w(:,cen) + 1;
+
+        output_F(w~=0) = v(w~=0)./w(w~=0);
+
+    else
+    %}
+   
+    for i=1:1:N_proj
+        x = (i-cen_x)*dk_x;
+        y = 0;
+
+        %Calculate new coordinate 
+        y_new = cos(ang)*y + sin(ang)*x;
+        x_new = -sin(ang)*y + cos(ang)*x; 
+
+        %Calculate weights
+        sy = abs(floor(y_new) - y_new); if sy<1e-6; sy=0; end
+        sx = abs(floor(x_new) - x_new); if sx<1e-6; sx=0; end
+
+        %Bilinear Extrapolation
+        %P1  
+        p_y = floor(y_new/dk_y)+cen_y;
+        p_x = floor(x_new/dk_x)+cen_x;
+        if p_x >0 && p_x<=Nx && p_y >0 && p_y<=Ny
+            mask(p_y,p_x) = 1; 
+        end
+
+        %P2
+        p_y = ceil(y_new/dk_y)+cen_y;
+        p_x = floor(x_new/dk_x)+cen_x;
+        if p_x>0 && p_x<=Nx && p_y >0 && p_y<=Ny
+            mask(p_y,p_x) = 1; 
+        end
+
+        %P3
+        p_y = floor(y_new/dk_y)+cen_y;
+        p_x = ceil(x_new/dk_x)+cen_x;        
+        if p_x>0 && p_x<=Nx && p_y >0 && p_y<=Ny
+            mask(p_y,p_x) = 1; 
+        end
+
+        %P4
+        p_y = ceil(y_new/dk_y)+cen_y;
+        p_x = ceil(x_new/dk_x)+cen_x;
+        if p_x>0 && p_x<=Nx && p_y >0 && p_y<=Ny
+            mask(p_y,p_x) = 1; 
+        end
+    end
+
+   
+end
+mask = mask==1;
+%}
+
+end
+