edu.emory.mathcs.jtransforms.dht
Class DoubleDHT_3D

java.lang.Object
  edu.emory.mathcs.jtransforms.dht.DoubleDHT_3D

public class DoubleDHT_3D
extends Object

Computes 3D Discrete Hartley Transform (DHT) of real, double precision data. The sizes of all three dimensions can be arbitrary numbers. This is a parallel implementation optimized for SMP systems.

Author:

Piotr Wendykier (piotr.wendykier@gmail.com)

Constructor Summary

DoubleDHT_3D(int n1, int n2, int n3)
Creates new instance of DoubleDHT_3D.

Method Summary

void	forward(double[] a) Computes the 3D real, forward DHT leaving the result in a.
void	forward(double[][][] a) Computes the 3D real, forward DHT leaving the result in a.
void	inverse(double[][][] a, boolean scale) Computes the 3D real, inverse DHT leaving the result in a.
void	inverse(double[] a, boolean scale) Computes the 3D real, inverse DHT leaving the result in a.

Methods inherited from class java.lang.Object

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

Constructor Detail

DoubleDHT_3D

public DoubleDHT_3D(int n1,
                    int n2,
                    int n3)

Creates new instance of DoubleDHT_3D.

Parameters:

n1 - number of slices

n2 - number of rows

n3 - number of columns

Method Detail

forward

public void forward(double[] a)

Computes the 3D real, forward DHT leaving the result in a. The data is stored in 1D array addressed in slice-major, then row-major, then column-major, in order of significance, i.e. the element (i,j,k) of 3D array x[n1][n2][n3] is stored in a[i*sliceStride + j*rowStride + k], where sliceStride = n2 * n3 and rowStride = n3.

Parameters:

a - data to transform

forward

public void forward(double[][][] a)

Computes the 3D real, forward DHT leaving the result in a. The data is stored in 3D array.

Parameters:

a - data to transform

inverse

public void inverse(double[] a,
                    boolean scale)

Computes the 3D real, inverse DHT leaving the result in a. The data is stored in 1D array addressed in slice-major, then row-major, then column-major, in order of significance, i.e. the element (i,j,k) of 3D array x[n1][n2][n3] is stored in a[i*sliceStride + j*rowStride + k], where sliceStride = n2 * n3 and rowStride = n3.

Parameters:

a - data to transform

scale - if true then scaling is performed

inverse

public void inverse(double[][][] a,
                    boolean scale)

Computes the 3D real, inverse DHT leaving the result in a. The data is stored in 3D array.

Parameters:

a - data to transform

scale - if true then scaling is performed