From b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b Mon Sep 17 00:00:00 2001
From: priyanka
Date: Wed, 24 Jun 2015 15:03:17 +0530
Subject: initial commit / add all books

---
 3176/CH4/EX4.14/Ex4_14.sce | 63 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 63 insertions(+)
 create mode 100644 3176/CH4/EX4.14/Ex4_14.sce

(limited to '3176/CH4/EX4.14')

diff --git a/3176/CH4/EX4.14/Ex4_14.sce b/3176/CH4/EX4.14/Ex4_14.sce
new file mode 100644
index 000000000..cd115043a
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+++ b/3176/CH4/EX4.14/Ex4_14.sce
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+//Ex4_14
+// Futher Illustration of a Properties of a Fourier Spectrum and Phase Angle
+// 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_14.tif");
+mask=imread("Ex4_14_2.tif");
+mask=im2double(imresize(mask,[512 512]));
+//gray=rgb2gray(a);
+gray=im2double(a);
+
+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
+in=fftshift(h);//fftshift() is used to rearrange the fft output, moving the zero frequency to the center of the spectrum.
+i=log(1+abs(in));
+
+inm=mat2gray(i);
+//figure,ShowImage(inm,'Center Frequency Spectrum');
+//title('Center Frequency Spectrum');
+
+phase=atand(imag(h),real(h));
+phase_1=mat2gray(phase);
+figure,ShowImage(phase_1,'phase Spectrum');
+title('phase Spectrum','color','blue','fontsize',4);
+
+phase_mask=atand(imag(fft2(mask)),real(fft2(mask)));
+phase_2=mat2gray(phase_mask);
+//figure,ShowImage(phase_2,'phase Spectrum');
+//title('phase Spectrum 2');
+
+Image_recoverd=real(ifft(phase));
+Image_recoverd=mat2gray(Image_recoverd)
+//figure,ShowImage(Image_recoverd,'recoverd Image');
+//title('recoverd Image by only Phase');
+
+
+Image_recoverd=fftshift(real(ifft(abs(h))));
+Image_recoverd=mat2gray(Image_recoverd)
+figure,ShowImage(Image_recoverd,'recoverd Image');
+title('recoverd Image by only Spectrum','color','blue','fontsize',4);
+
+
+Image_recoverd=real(ifft(fftshift((mask.*in)+phase)));
+Image_recoverd=(mat2gray(Image_recoverd));
+figure,ShowImage(Image_recoverd,'recoverd Image');
+title('recoverd Image by Magnitude in mask and Phase','color','blue','fontsize',4);
+
+
+Image_recoverd=real(ifft(fftshift(in)+abs(fft2(mask))));
+Image_recoverd=(mat2gray(Image_recoverd));
+figure,ShowImage(Image_recoverd,'recoverd Image');
+title('recoverd Image by phase in mask and magnitude','color','blue','fontsize',4);
-- 
cgit