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Diffstat (limited to '3176/CH4/EX4.22/Ex4_22.sce')
-rw-r--r-- | 3176/CH4/EX4.22/Ex4_22.sce | 126 |
1 files changed, 59 insertions, 67 deletions
diff --git a/3176/CH4/EX4.22/Ex4_22.sce b/3176/CH4/EX4.22/Ex4_22.sce index 1c4ce8727..299398dfa 100644 --- a/3176/CH4/EX4.22/Ex4_22.sce +++ b/3176/CH4/EX4.22/Ex4_22.sce @@ -1,67 +1,59 @@ -//Ex4_22
-// Image Enhancement using Homomorphic Filtering
-// 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]=filter(type1,M,N,D0,low,high,c)//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); // Generate 2-d matrix from 1-d matrix
- D=sqrt(U.^2+V.^2); // distnace calculation
- select type1
- case'Homomorphic'then
- H=((high-low).*(1-(exp(-c*(D.^2)./(D0^2)))))+low;
- else
- disp('Unknownfiltertype.')
- end
-endfunction
-
-
-/////////////////////////////////// Main Programm ////////////////////////////////
-
-a=imread("Ex4_22.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);
-low=0.25;
-high=2;
-c=1;
-D0=80;
-filt=filter('Homomorphic',M,N,D0,low,high,c); // User Define Function which generate Filter Mask
-
-n=filt.*h;//Multiply the Original Spectrum with the Filter Mask.
-Image_filter=real(ifft(n));
-//Image_Enhance = hiseq(a);
-
-Image_filter=mat2gray(Image_filter);
-figure,ShowImage(Image_filter,'Filtered Image');
-title('Filtered Image with Specific Cut-Off Frequency','color','blue','fontsize',4);
-
-
-
-
-
-
-
-
+//Ex4_22 +// Image Enhancement using Homomorphic Filtering +// 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]=filter(type1,M,N,D0,low,high,c)//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); // Generate 2-d matrix from 1-d matrix + D=sqrt(U.^2+V.^2); // distnace calculation + select type1 + case'Homomorphic' + H=((high-low).*(1-(exp(-c*(D.^2)./(D0^2)))))+low; + else + disp('Unknownfiltertype.') + end +endfunction + + +/////////////////////////////////// Main Programm //////////////////////////////// + +a=imread("Ex4_22.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); +low=0.25; +high=2; +c=1; +D0=80; +filt=filter('Homomorphic',M,N,D0,low,high,c); // User Define Function which generate Filter Mask + +n=filt.*h;//Multiply the Original Spectrum with the Filter Mask. +Image_filter=real(ifft(n)); +//Image_Enhance = hiseq(a); + +Image_filter=mat2gray(Image_filter); +figure,ShowImage(Image_filter,'Filtered Image'); +title('Filtered Image with Specific Cut-Off Frequency','color','blue','fontsize',4);
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