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In mathematics, the Haar wavelet is a certain sequence of rescaled "square-shaped" functions which together form a wavelet family or basis. The Haar sequence is now recognised as the first known wavelet basis and extensively used as a teaching example in the theory of wavelets. — “Haar wavelet - Wikipedia, the free encyclopedia”, en.wikipedia.org
They owe their name to their intuitive similarity with Haar wavelets and were used in the first real-time face detector. A Haar-like feature considers adjacent rectangular regions at a specific location in a detection window, sums up the pixel intensities in these regions and calculates. — “Haar-like features - Wikipedia, the free encyclopedia”, en.wikipedia.org
Haar measure. From Wikipedia, the free encyclopedia. Jump to: navigation, search. In mathematical analysis, the Haar measure is a way to assign an "invariant volume" to subsets of locally compact topological groups and subsequently define an integral for functions on those groups. — “Haar measure - Wikipedia, the free encyclopedia”, en.wikipedia.org