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java.lang.Objectmath.jtransforms.dct.DoubleDCT_2D
public class DoubleDCT_2D
Computes 2D Discrete Cosine Transform (DCT) of double precision data. The
sizes of both 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)
Constructor Summary | |
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DoubleDCT_2D(int rows,
int columns)
Creates new instance of DoubleDCT_2D. |
Method Summary | |
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void |
forward(double[][] a,
boolean scale)
Computes 2D forward DCT (DCT-II) leaving the result in a . |
void |
forward(double[] a,
boolean scale)
Computes 2D forward DCT (DCT-II) leaving the result in a . |
void |
inverse(double[][] a,
boolean scale)
Computes 2D inverse DCT (DCT-III) leaving the result in a . |
void |
inverse(double[] a,
boolean scale)
Computes 2D inverse DCT (DCT-III) leaving the result in a . |
Methods inherited from class java.lang.Object |
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equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public DoubleDCT_2D(int rows, int columns)
rows
- number of rowscolumns
- number of columnsMethod Detail |
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public void forward(double[] a, boolean scale)
a
.
The data is stored in 1D array in row-major order.
a
- data to transformscale
- if true then scaling is performedpublic void forward(double[][] a, boolean scale)
a
.
The data is stored in 2D array.
a
- data to transformscale
- if true then scaling is performedpublic void inverse(double[] a, boolean scale)
a
.
The data is stored in 1D array in row-major order.
a
- data to transformscale
- if true then scaling is performedpublic void inverse(double[][] a, boolean scale)
a
.
The data is stored in 2D array.
a
- data to transformscale
- if true then scaling is performed
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