im1 = imread('mountain.jpg');
figure(1);
imshow(im1);
figure(2);
%Translate by 240 pixels on the X-axis
im1 = imtranslate(im1, [240 0]);
imshow(im1);
spy(S) plots the sparsity pattern of matrix S. Nonzero values are colored while zero values are white. The plot displays the number of nonzeros in the matrix.
To show spy() values you can check the following
im1 = imread('mountain.jpg');
figure(1);
im1Double = im2double(im1);
spy(im1Double);
figure(2);
im1 = imtranslate(im1, [250 0]);
spy(im1Double);