updated the code

1 files changed, 72 insertions, 80 deletions

diff --git a/3176/CH4/EX4.20/Ex4_20.sce b/3176/CH4/EX4.20/Ex4_20.sce
index a193300fd..41226efb3 100644
--- a/3176/CH4/EX4.20/Ex4_20.sce
+++ b/3176/CH4/EX4.20/Ex4_20.sce
@@ -1,80 +1,72 @@
-//Ex4_20

-// Image Sharping in Frequency Domain Using the Laplacian

-// Version : Scilab 5.4.1

-// Operating System : Window-xp, Window-7

-//Toolbox: Image Processing Design 8.3.1-1

-//Toolbox: SIVP 0.5.3.1-2

-//Reference book name : Digital Image Processing

-//book author: Rafael C. Gonzalez and Richard E. Woods

-

-clc;

-close;

-clear;

-xdel(winsid())//to close all currently open figure(s).

-

-function[H]=lowpassfilter(type1,M,N,D0,n)//lowpassfilter is used to filter an image .

-    u=0:(M-1);

-    v=0:(N-1);

-    idx=find(u>M/2);

-    u(idx)=u(idx)-M;

-    idy=find(v>N/2);

-    v(idy)=v(idy)-N;

-    [U,V]=meshgrid(v,u);

-    D=sqrt(U.^2+V.^2);

-    select type1

-        

-    case'ideal'then

-        H=double(D<=D0);

-        

-    case'Laplacian'then

-        H_temp=double(D<=D0);

-        H=(4*(%pi)^2*D^2);

-        H=H.*H_temp;

-        

-    case'butterworth'then

-        if argn(2)==4 then

-            n=1;

-        end

-        H = ones(M,N)./(1+(D./D0).^(2*n));

-        H_temp=ones(M,N)+(4*(%pi)^2*D^2);

-        H=H.*H_temp;

-        

-        case'gaussian'then

-        H=exp(-(D.^2)./(2*(D0^2)));

-    else

-        disp('Unknownfiltertype.')

-    end

-endfunction

-

-

-

-///////////////////////////////////   Main Programm   ////////////////////////////////

-a=imread("Ex4_20.tif");

-//gray=rgb2gray(a);

-gray=im2double(imresize(a,[540 540]));

-

-figure,ShowImage(gray,'Gray Image');

-title('Original Image','color','blue','fontsize',4);

-[M,N]=size(gray);

-

-h=fft2(gray);//fft2() is used to find 2-Dimensional Fast Fourier Transform of an matrix

-i=log(1+abs(h));

-in=fftshift(i);//fftshift() is used to rearrange the fft output, moving the zero frequency to the center of the spectrum.

-inm=mat2gray(in);

-filt=lowpassfilter('Laplacian',M,N,55); // User Define Function which generate Filter Mask Corresponding to Low Frequency

-filt_shift=fftshift(filt);

-n=filt.*h;//Multiply the Original Spectrum with the Filter Mask.

-Image_filter=real(ifft(n));

-Image_filter=mat2gray(Image_filter);

-

-z=gray+Image_filter;

-figure,ShowImage(mat2gray(z),'Filtered Image');

-title('Filtered Image with Specific Cut-Off Frequency','color','blue','fontsize',4);

-

-

-

-

-

-

-

-

+//Ex4_20
+// Image Sharping in Frequency Domain Using the Laplacian
+// Version : Scilab 5.4.1
+// Operating System : Window-xp, Window-7
+//Toolbox: Image Processing Design 8.3.1-1
+//Toolbox: SIVP 0.5.3.1-2
+//Reference book name : Digital Image Processing
+//book author: Rafael C. Gonzalez and Richard E. Woods
+
+clc;
+close;
+clear;
+xdel(winsid())//to close all currently open figure(s).
+
+function[H]=lowpassfilter(type1,M,N,D0,n)//lowpassfilter is used to filter an image .
+    u=0:(M-1);
+    v=0:(N-1);
+    idx=find(u&gt;M/2);
+    u(idx)=u(idx)-M;
+    idy=find(v&gt;N/2);
+    v(idy)=v(idy)-N;
+    [U,V]=meshgrid(v,u);
+    D=sqrt(U.^2+V.^2);
+    select type1
+        
+    case'ideal'
+        H=double(D&lt;=D0);
+        
+    case'Laplacian'
+        H_temp=double(D&lt;=D0);
+        H=(4*(%pi)^2*D^2);
+        H=H.*H_temp;
+        
+    case'butterworth'
+        if argn(2)==4 
+            n=1;
+        end
+        H = ones(M,N)./(1+(D./D0).^(2*n));
+        H_temp=ones(M,N)+(4*(%pi)^2*D^2);
+        H=H.*H_temp;
+        
+        case'gaussian'
+        H=exp(-(D.^2)./(2*(D0^2)));
+    else
+        disp('Unknownfiltertype.')
+    end
+endfunction
+
+
+
+///////////////////////////////////   Main Programm   ////////////////////////////////
+a=imread("Ex4_20.tif");
+//gray=rgb2gray(a);
+gray=im2double(imresize(a,[540 540]));
+
+figure,ShowImage(gray,'Gray Image');
+title('Original Image','color','blue','fontsize',4);
+[M,N]=size(gray);
+
+h=fft2(gray);//fft2() is used to find 2-Dimensional Fast Fourier Transform of an matrix
+i=log(1+abs(h));
+in=fftshift(i);//fftshift() is used to rearrange the fft output, moving the zero frequency to the center of the spectrum.
+inm=mat2gray(in);
+filt=lowpassfilter('Laplacian',M,N,55); // User Define Function which generate Filter Mask Corresponding to Low Frequency
+filt_shift=fftshift(filt);
+n=filt.*h;//Multiply the Original Spectrum with the Filter Mask.
+Image_filter=real(ifft(n));
+Image_filter=mat2gray(Image_filter);
+
+z=gray+Image_filter;
+figure,ShowImage(mat2gray(z),'Filtered Image');
+title('Filtered Image with Specific Cut-Off Frequency','color','blue','fontsize',4);
\ No newline at end of file