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the branch of mathematics that deals with the mathematical aspects of problems from science and engineering: applied analysis, numerical mathematics, applied statistics etc. (For applications of mathematics in general, cf. also the [applications] tag.)

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Rotationally-Invariant 2D Discrete Transforms

Fourier Mellin Transform is position rotation and scale invariant. See http://theja.org/static/docs/2008Sept_theja_paper_prsi.pdf for references.
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