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//Caption: Scilab code to generate different levels of a Gaussian pyramid
//Fig12.42
//Page651
clc;
close;
a = imread('E:\DIP_JAYARAMAN\Chapter12\apple3.bmp');
a = rgb2gray(a);
b = a;
kernelsize = input('Enter the size of the kernel:');
sd = input('Enter the standard deviation of hte Gaussian window:');
rf = input('Enter the Reduction Factor:');
//Routine to generate Gaussian kernel
k = zeros(kernelsize, kernelsize);
[m n] = size(b);
t = 0;
for i = 1:kernelsize
for j=1:kernelsize
k(i,j) = exp(-((i-kernelsize/2).^2+(j-kernelsize/2).^2)/(2*sd.^2))/(2*%pi*sd.^2);
t = t+k(i,j);
end
end
for i = 1:kernelsize
for j = 1:kernelsize
k(i,j) = k(i,j)/t;
end
end
for t = 1:1:rf
//convolve it with the picture
FilteredImg = b;
if t==1
FilteredImg = filter2(k,b)/255;
else
FilteredImg = filter2(k,b);
end;
//compute the size of the reduced image
m = m/2;
n = n/2;
//create the reduced image through sampling
b = zeros(m,n);
for i = 1:m
for j = 1:n
b(i,j) = FilteredImg(i*2,j*2);
end;
end;
end;
figure
ShowImage(a,'Original Image')
figure
ShowImage(b,'Different Levels of Gausain Pyramid')
title('Different Levels of Gausain Pyramid Level 2')
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