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.

Part of code is derived from General Purpose FFT Package written by Takuya Ooura (http://www.kurims.kyoto-u.ac.jp/~ooura/fft.html)

Author:

Piotr Wendykier (piotr.wendykier@gmail.com)

Constructor Summary

Constructors

Constructor and Description
DoubleDHT_3D(int slices, int rows, int columns) Creates new instance of DoubleDHT_3D.

Method Summary

Methods

Modifier and Type	Method and Description
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

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

Constructor Detail

DoubleDHT_3D

public DoubleDHT_3D(int slices,
            int rows,
            int columns)

Creates new instance of DoubleDHT_3D.

Parameters:

slices - number of slices

rows - number of rows

columns - 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[slices][rows][columns] is stored in a[i*sliceStride + j*rowStride + k], where sliceStride = rows * columns and rowStride = columns.

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[slices][rows][columns] is stored in a[i*sliceStride + j*rowStride + k], where sliceStride = rows * columns and rowStride = columns.

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