%Chapter 6,  Fig 6.2
%Eric Dubois, updated 2018-12-12
%Illustration of aliasing in the Barbara image

clear all, close all;

A = im2double(imread('barb512_gray.tif'));
figure, imshow(A);
S = size(A);
B = A(1:2:S(1),1:2:S(2));
figure, imshow(B);