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/*
-----------------------------------------------------------------------
Copyright 2012 iMinds-Vision Lab, University of Antwerp
Contact: astra@ua.ac.be
Website: http://astra.ua.ac.be
This file is part of the
All Scale Tomographic Reconstruction Antwerp Toolbox ("ASTRA Toolbox").
The ASTRA Toolbox is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
The ASTRA Toolbox is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with the ASTRA Toolbox. If not, see <http://www.gnu.org/licenses/>.
-----------------------------------------------------------------------
$Id$
*/
#ifndef _INC_ASTRA_FOURIER
#define _INC_ASTRA_FOURIER
#include "Globals.h"
namespace astra {
/**
* Perform a 1D DFT or inverse DFT.
*
* @param iLength number of elements
* @param pfRealIn real part of input
* @param pfImaginaryIn imaginary part of input
* @param pfRealOut real part of output
* @param pfImaginaryOut imaginary part of output
* @param iStrideIn distance between elements in pf*In
* @param iStrideOut distance between elements in pf*Out
* @param bInverse if true, perform an inverse DFT
*/
void _AstraExport discreteFourierTransform1D(unsigned int iLength,
const float32* pfRealIn,
const float32* pfImaginaryIn,
float32* pfRealOut,
float32* pfImaginaryOut,
unsigned int iStrideIn,
unsigned int iStrideOut,
bool bInverse);
/**
* Perform a 2D DFT or inverse DFT.
*
* @param iHeight number of rows
* @param iWidth number of columns
* @param pfRealIn real part of input
* @param pfImaginaryIn imaginary part of input
* @param pfRealOut real part of output
* @param pfImaginaryOut imaginary part of output
* @param bInverse if true, perform an inverse DFT
*/
void _AstraExport discreteFourierTransform2D(unsigned int iHeight, unsigned int iWidth,
const float32* pfRealIn,
const float32* pfImaginaryIn,
float32* pfRealOut,
float32* pfImaginaryOut,
bool bInverse);
/**
* Perform a 1D FFT or inverse FFT. The size must be a power of two.
* This transform can be done in-place, so the input and output pointers
* may point to the same data.
*
* @param iLength number of elements, must be a power of two
* @param pfRealIn real part of input
* @param pfImaginaryIn imaginary part of input
* @param pfRealOut real part of output
* @param pfImaginaryOut imaginary part of output
* @param iStrideIn distance between elements in pf*In
* @param iStrideOut distance between elements in pf*Out
* @param bInverse if true, perform an inverse DFT
*/
void _AstraExport fastTwoPowerFourierTransform1D(unsigned int iLength,
const float32* pfRealIn,
const float32* pfImaginaryIn,
float32* pfRealOut,
float32* pfImaginaryOut,
unsigned int iStrideIn,
unsigned int iStrideOut,
bool bInverse);
/**
* Perform a 2D FFT or inverse FFT. The size must be a power of two.
* This transform can be done in-place, so the input and output pointers
* may point to the same data.
*
* @param iHeight number of rows, must be a power of two
* @param iWidth number of columns, must be a power of two
* @param pfRealIn real part of input
* @param pfImaginaryIn imaginary part of input
* @param pfRealOut real part of output
* @param pfImaginaryOut imaginary part of output
* @param bInverse if true, perform an inverse DFT
*/
void _AstraExport fastTwoPowerFourierTransform2D(unsigned int iHeight,
unsigned int iWidth,
const float32* pfRealIn,
const float32* pfImaginaryIn,
float32* pfRealOut,
float32* pfImaginaryOut,
bool bInverse);
}
#endif
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