Module imagingbook.spectral

Package imagingbook.spectral.dft

Class Dft1dDirect.Double

java.lang.Object

imagingbook.spectral.dft.Dft1dDirect

imagingbook.spectral.dft.Dft1dDirect.Double

All Implemented Interfaces:

Dft1d, Dft1d.Double

Enclosing class:

Dft1dDirect

public static class Dft1dDirect.Double
extends Dft1dDirect
implements Dft1d.Double

One-dimensional DFT implementation using double data.

Nested Class Summary

Nested classes/interfaces inherited from class imagingbook.spectral.dft.Dft1dDirect

Dft1dDirect.Double, Dft1dDirect.Float

Nested classes/interfaces inherited from interface imagingbook.spectral.dft.Dft1d

Dft1d.Double, Dft1d.Float

Constructor Summary

Constructors

Constructor	Description
Double(int M)	Constructor using the default scaling mode.
Double(int M, ScalingMode sm)	Constructor using a specific scaling mode.

Method Summary

Modifier and Type	Method	Description
void	forward(double[] gRe, double[] gIm)	Performs an "in-place" 1D DFT forward transformation on the supplied double data.
ScalingMode	getScalingMode()	Returns the scaling mode of this DFT (see ScalingMode).
int	getSize()	Returns the size of this DFT (length of data vectors).
void	inverse(double[] GRe, double[] GIm)	Performs an "in-place" 1D DFT inverse transformation on the supplied double spectrum.
void	transform(double[] inRe, double[] inIm, boolean forward)	Transforms the given 1D arrays 'in-place'.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface imagingbook.spectral.dft.Dft1d

getScalingMode, getSize

Methods inherited from interface imagingbook.spectral.dft.Dft1d.Double

checkSize

Constructor Details

Double

public Double(int M,
 ScalingMode sm)

Constructor using a specific scaling mode.

Parameters:

M - the size of the data vectors

sm - the scaling mode

Double

public Double(int M)

Constructor using the default scaling mode.

Parameters:

M - the size of the data vectors

Method Details

forward

public void forward(double[] gRe,
 double[] gIm)

Description copied from interface: Dft1d.Double

Performs an "in-place" 1D DFT forward transformation on the supplied double data. The input signal is replaced by the associated DFT spectrum.

Specified by:

forward in interface Dft1d.Double

Parameters:

gRe - real part of the signal (modified)

gIm - imaginary part of the signal (modified)

inverse

public void inverse(double[] GRe,
 double[] GIm)

Description copied from interface: Dft1d.Double

Performs an "in-place" 1D DFT inverse transformation on the supplied double spectrum. The input spectrum is replaced by the associated signal.

Specified by:

inverse in interface Dft1d.Double

Parameters:

GRe - real part of the spectrum (modified)

GIm - imaginary part of the spectrum (modified)

transform

public void transform(double[] inRe,
 double[] inIm,
 boolean forward)

Description copied from interface: Dft1d.Double

Transforms the given 1D arrays 'in-place'. Separate arrays of identical size must be supplied for the real and imaginary parts of the signal (forward) or spectrum (inverse), neither of which may be null.

Specified by:

transform in interface Dft1d.Double

Parameters:

inRe - real part of the input signal or spectrum (modified)

inIm - imaginary part of the input signal or spectrum (modified)

forward - forward transformation if true, inverse transformation if false

getSize

public int getSize()

Description copied from interface: Dft1d

Returns the size of this DFT (length of data vectors).

Specified by:

getSize in interface Dft1d

Returns:

the size of this DFT

getScalingMode

public ScalingMode getScalingMode()

Description copied from interface: Dft1d

Returns the scaling mode of this DFT (see ScalingMode).

Specified by:

getScalingMode in interface Dft1d

Returns:

the scaling mode of this DFT.