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+//Ex2_6

+//Image Subtraction for Enhancing differences

+// 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).

+gray=imread("Ex2_6.tif");

+gray=imresize(gray,0.25,'bicubic'); //Resize the Image with bicubic Interpolation

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

+title('Original Image');

+[nr nc]=size(gray);

+for i=1:8

+    c(:,:,i)=mtlb_logical(bitget(gray,9-i)); // Separate bit Planes from the Gray Scale Image 

+    

+end

+c(:,:,8)=zeros(nr,nc);  // Set Zeros to LSB

+//c(:,:,7)=zeros(nr,nc);  // Set Zeros to LSB

+

+for i=1:nr

+    for j=1:nc

+        mask(i,j)=(2^7)*c(i,j,1)+(2^6)*c(i,j,2)+(2^5)*c(i,j,3)+(2^4)*c(i,j,4)+(2^3)*c(i,j,5)+(2^2)*c(i,j,6)+(2^1)*c(i,j,7)+(2^0)*c(i,j,8);

+    end

+end

+figure;ShowImage(mask,'Modified Image');

+title('Image Obtained by Setting Zeros to LSB ');

+mask=uint8(mask);  //Convert the Image to uint8 Data Type

+Diff_image=imsubtract(gray,mask);  //Subtract two Images

+Diff_image=mat2gray(Diff_image);

+figure;ShowImage(Diff_image,'Modified Image');

+title('Difference of two images');