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Definition of "top hat transform" |
a transform used in mathematical morphology. Let A be a structuring element centered about the origin, and for every pixel p, let Ap be its translate by p. The top hat transform measures the extent by which in a given gray-level image I the gray-levels of pixels in Ap are higher than those in the portion surrounding Ap. One way is to take the arithmetical difference I − (I o A) between I and the opening I o A of I by A; in a dual form, one takes the arithmetic difference |
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