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| author | priyanka | 2015-06-24 15:03:17 +0530 |
|---|---|---|
| committer | priyanka | 2015-06-24 15:03:17 +0530 |
| commit | b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b (patch) | |
| tree | ab291cffc65280e58ac82470ba63fbcca7805165 /3176/CH4/EX4.13/Ex4_13.sce | |
| download | Scilab-TBC-Uploads-b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b.tar.gz Scilab-TBC-Uploads-b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b.tar.bz2 Scilab-TBC-Uploads-b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b.zip | |
initial commit / add all books
Diffstat (limited to '3176/CH4/EX4.13/Ex4_13.sce')
| -rw-r--r-- | 3176/CH4/EX4.13/Ex4_13.sce | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/3176/CH4/EX4.13/Ex4_13.sce b/3176/CH4/EX4.13/Ex4_13.sce new file mode 100644 index 000000000..dbc2fc153 --- /dev/null +++ b/3176/CH4/EX4.13/Ex4_13.sce @@ -0,0 +1,79 @@ +//Ex4_13
+//The 2-D Fourier Spectrum of a Simple Function
+// 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).
+a=imread("Ex4_13_1.tif");
+a=imresize(a,0.5);
+//gray=rgb2gray(a);
+gray=im2double(a);
+
+figure,ShowImage(gray,'Gray Image');
+title('Original Image','color','blue','fontsize',4);
+[M,N]=size(gray);
+
+h1=fft2(gray);//fft2() is used to find 2-Dimensional Fast Fourier Transform of an matrix
+figure,ShowImage(mat2gray(abs(h1)),'Frequency spectrum');
+title('Frequency spectrum','color','blue','fontsize',4);
+
+in=fftshift(h1);//fftshift() is used to rearrange the fft output, moving the zero frequency to the center of the spectrum.
+figure,ShowImage(mat2gray(abs(in)),'Frequency spectrum');
+title('Centred Frequency spectrum','color','blue','fontsize',4);
+
+i=log(1+abs(in));
+inm=mat2gray(i)
+figure,ShowImage(inm,'Frequency Spectrum');//ShowColorImage() is used to show color image, figure is command to view images in separate window.
+title('Frequency Spectrum','color','blue','fontsize',4);//title() is used for providing a title to an image.
+
+/////////////////////////// Effect of Translation //////////////////////////////
+a=imread("Ex4_13_2.png");
+gray=rgb2gray(a);
+gray=im2double(gray);
+figure,ShowImage(gray,'Gray Image');
+title('Original Image','color','blue','fontsize',4);
+[M,N]=size(gray);
+h2=fft2(gray);//fft2() is used to find 2-Dimensional Fast Fourier Transform of an matrix
+i=log(1+abs(h2));
+in=fftshift(i);//fftshift() is used to rearrange the fft output, moving the zero frequency to the center of the spectrum.
+inm=mat2gray(in)
+figure,ShowImage(inm,'Frequency Spectrum');//ShowColorImage() is used to show color image, figure is command to view images in separate window.
+title('Frequency Spectrum','color','blue','fontsize',4);//title() is used for providing a title to an image.
+
+/////////////////////////// Effect of Rotation //////////////////////////////
+a=imread("Ex4_13_3.png");
+gray=rgb2gray(a);
+gray=im2double(gray);
+figure,ShowImage(gray,'Gray Image');
+title('Original Image','color','blue','fontsize',4);
+[M,N]=size(gray);
+h3=fft2(gray);//fft2() is used to find 2-Dimensional Fast Fourier Transform of an matrix
+i=log(1+abs(h3));
+in=fftshift(i);//fftshift() is used to rearrange the fft output, moving the zero frequency to the center of the spectrum.
+inm=mat2gray(in)
+figure,ShowImage(inm,'Frequency Spectrum');//ShowColorImage() is used to show color image, figure is command to view images in separate window.
+title('Frequency Spectrum','color','blue','fontsize',4);//title() is used for providing a title to an image.
+
+
+/////////////////////////// Phase Spectrum //////////////////////////////
+phase=atand(imag(h1),real(h1));
+phase_1=mat2gray(phase);
+figure,ShowImage(phase_1,'phase Spectrum');
+title('phase Spectrum','color','blue','fontsize',4);
+
+phase=atand(imag(h2),real(h2));
+phase_1=mat2gray(phase);
+figure,ShowImage(phase_1,'phase Spectrum');
+title('phase Spectrum of Translated Object','color','blue','fontsize',4);
+
+phase=atand(imag(h3),real(h3));
+phase_1=mat2gray(phase);
+figure,ShowImage(phase_1,'phase Spectrum');
+title('phase Spectrum of Rotated Object','color','blue','fontsize',4);
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