This image is from my monthly column in the
Dutch computer magazine PC-Active.
It is a depiction of a two-dimensional wavelet transformation of an
image of Lena, a standard test
image for image processing algorithms. One of the things you can see
here is that the top right block detects vertical structures in the
image, such as Lena's hair and her arm. The left bottom block detects
horizontal structures, such as her mouth and shoulder. The bottom right
block detects diagonal structures. The smaller blocks do the same, but
on a smaller scale.
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