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Scale-space pyramids
Write an m-file "scale_space.m" which computes scale space representation of an input image for a given scale "sigma" and displays them. (i) 4 scale levels, all the levels have the same size.
function scale_space(imn, sigma) s=sigma; figure(1); imshow(imn,[]); for i=1:3 g=gauss(s); imgx=? imgxy=? s=? figure(i+1); imshow(imgxy,[]);
end
(ii) 4 scale levels, every next level is twice smaller than the previous one. To sample the image use: imn=imgxy(1:sampling_step:end,1:sampling_step:end); Choose the sampling_step.
Discuss these representations. How do they differ? Are they equivalent? Which one is more suitable? Why?
problem 3.20
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