How are these two Images different?

Hello,

I am new to image processing.so, I have difficulty in differentiating these two images attaches. First image is Original Image(org.jpg) while the second image is obtained by applying Gaussian transform(nor.jpg). Both the images have same background to foreground ratio and size but one of them looks bigger.

My question is why is it so?

The code used is given below: %% Usage:- Scale Normalization % Date 11th June, 2014 1.48 A.M.

function IF_Img=FaceNormalization(I) close all;

% Applying Gaussian smoothing filter sigma=0.01; I=im2double(rgb2gray(I)); PQ=size(I); F_Img=fft2(I); H=zeros(PQ(1),PQ(2)); for i=1:PQ(1); % filter for j=1:PQ(2); H(i,j)=(sigma*sigma)*(1/(2*pi*sigma*sigma).*(-(i*i+j*j)/(2*sigma*sigma)).*exp(-(i*i+j*j)/(2*sigma*sigma))); end; end; H=fftshift(H); % figure;imshow(H); F_Img=fftshift(F_Img); % figure;imshow(F_Img); IF_Img=real(ifft2(H.*F_Img))+I; IF_Img=IF_Img(1:size(I,1),1:size(I,2)); % IF_Img=convn(I,H); % figure; imagesc(IF_Img); colormap(gray);

Thanks!!