clear
clc

I1 = imread('lena.bmp');
I2 = imread('cameraman.bmp');

I3 = uint8(zeros(256));

for j = 1 : 256
    if (rem(j, 2) == 1)
        I3(:, j) = I1(:, j);
    end
    if (rem(j, 2) == 0)
        I3(:, j) = I2(:, j);
    end
end

H=(1/81)*ones(9);
I4 = imfilter(I3,H);

subplot(2,2,1), imshow(I1,[0 255]), title('Lena')
subplot(2,2,2), imshow(I2,[0 255]), title('cameraman')
subplot(2,2,3), imshow(I3,[0 255]), title('combination')
subplot(2,2,4), imshow(I4,[0 255]), title('filtered')