direct Fourier transform

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• Fourier transform — Fourier transforms Continuous Fourier transform Fourier series Discrete Fourier transform Discrete time Fourier transform Related transforms The Fourier transform is a mathematical operation that decomposes a function into its constituent… …   Wikipedia

• Fourier transform spectroscopy — is a measurement technique whereby spectra are collected based on measurements of the temporal coherence of a radiative source, using time domain measurements of the electromagnetic radiation or other type of radiation.It can be applied to a… …   Wikipedia

• Discrete Fourier transform — Fourier transforms Continuous Fourier transform Fourier series Discrete Fourier transform Discrete time Fourier transform Related transforms In mathematics, the discrete Fourier transform (DFT) is a specific kind of discrete transform, used in… …   Wikipedia

• Mukai-Fourier transform — The Mukai Fourier transform is a transformation used in algebraic geometry. It is somewhat analogous to the classical Fourier transform used in analysis.DefinitionLet X be an abelian variety and hat X be its dual variety. We denote by mathcal P… …   Wikipedia

• Short-time Fourier transform — The short time Fourier transform (STFT), or alternatively short term Fourier transform, is a Fourier related transform used to determine the sinusoidal frequency and phase content of local sections of a signal as it changes over time. STFT… …   Wikipedia

• Fourier optics — is the study of classical optics using techniques involving Fourier transforms and can be seen as an extension of the Huygens Fresnel principle. The underlying theorem that light waves can be described as made up of sinusoidal waves, in a manner… …   Wikipedia

• Direct method — may refer to Direct method (education) for learning a foreign language Direct method (computational mathematics) as opposed to iterative method Direct methods (crystallography) for estimating the phases of the Fourier transform of the scattering… …   Wikipedia

• Fourier–Mukai transform — The Fourier–Mukai transform or Mukai–Fourier transform is a transformation used in algebraic geometry. It is somewhat analogous to the classical Fourier transform used in analysis.[clarification needed] Definition Let X be an abelian variety and… …   Wikipedia

• Direct methods (crystallography) — In crystallography, direct methods are a family of methods for estimating the phases of the Fourier transform of the scattering density from the corresponding magnitudes. The methods generally exploit constraints or statistical correlations… …   Wikipedia

• transform — transformable, adj. transformative, adj. v. /trans fawrm /; n. /trans fawrm/, v.t. 1. to change in form, appearance, or structure; metamorphose. 2. to change in condition, nature, or character; convert. 3. to change into another substance;… …   Universalium

• transform — Fourier t. SYN: Fourier analysis. * * * trans·form tran(t)s fȯ(ə)rm vt to cause to change: as a) to change (a current) in potential (as from high voltage to low) or in type (as from alternating to direct) b) to cause (a cell) to undergo genetic… …   Medical dictionary