de.gsi.math.spectra.dct

Class DoubleDCT_3D

java.lang.Object

de.gsi.math.spectra.dct.DoubleDCT_3D

public class DoubleDCT_3D
extends Object

Computes 3D Discrete Cosine Transform (DCT) of double precision data. The sizes of all three dimensions can be arbitrary numbers. This is a parallel implementation of split-radix and mixed-radix algorithms optimized for SMP systems.

Part of the 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
DoubleDCT_3D(int slices, int rows, int columns) Creates new instance of DoubleDCT_3D.

Method Summary

Modifier and Type	Method and Description
void	forward(double[][][] a, boolean scale) Computes the 3D forward DCT (DCT-II) leaving the result in a .
void	forward(double[] a, boolean scale) Computes the 3D forward DCT (DCT-II) leaving the result in a .
void	inverse(double[][][] a, boolean scale) Computes the 3D inverse DCT (DCT-III) leaving the result in a.
void	inverse(double[] a, boolean scale) Computes the 3D inverse DCT (DCT-III) 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

DoubleDCT_3D

public DoubleDCT_3D(int slices,
                    int rows,
                    int columns)

Creates new instance of DoubleDCT_3D.

Parameters:

slices - number of slices

rows - number of rows

columns - number of columns

Method Detail

forward

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

Computes the 3D forward DCT (DCT-II) 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

forward

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

Computes the 3D forward DCT (DCT-II) leaving the result in a . The data is stored in 3D array

Parameters:

a - data to transform

scale - if true then scaling is performed

inverse

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

Computes the 3D inverse DCT (DCT-III) 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 inverse DCT (DCT-III) leaving the result in a. The data is stored in 3D array.

Parameters:

a - data to transform

scale - if true then scaling is performed