Put two different JPEG files into your Current Folder. Read both into matrix variables. To superimpose the images, if the matrices are the same size, the elements can simply be added element-by-element. However, if they are not the same size,

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Ch13Ex25.m

% Superimpose two images

% Crop one if necessary so they're the same size

im1 = imread('photo1.jpg');

im2 = imread('photo2.jpg');

[r1, c1, d1] = size(im1);

[r2, c2, d2] = size(im2);

%Check number of rows

if r1 > r2

 im1 = im1(1:r2,:,:);

elseif r1 < r2

 im2 = im2(1:r1,:,:);

end

%Check number of columns

if c1 > c2

 im1 = im1(:,1:c2,:);

elseif c1 < c2

 im2 = im2(:,1:c1,:);

end

[r1 c1 d1] = size(im1);

[r2 c2 d2] = size(im2);

%Superimpose 

im3 = im1 + im2;

image(im3)

In a random walk, every time a “step” is taken, a direction is randomly 

chosen. Watching a random walk as it evolves, by viewing it as an 

image, can be very entertaining. However, there are actually very 

practical applications of random walks; they can be used to simulate 

diverse events such as the spread of a forest fire or the growth of a 

dendritic crystal.

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