Wavelet Analysis

Wavelet Analysis — A mathematical principle that cuts data into different frequency components then studies the components matched to its scale
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See also:
Digital Detectives Reveal Art Forgeries — an article from Computing in Science and Engineering discussing how wavelet analysis can be used to discover art forgeries (2005)
Different Strokes — an article in The Economist that uses wavelet analysis to discover art forgeries (Nov. 2004)