Parallel Colt 0.7.2

edu.emory.mathcs.jtransforms.dct
Class FloatDCT_2D

java.lang.Object
  extended by edu.emory.mathcs.jtransforms.dct.FloatDCT_2D

public class FloatDCT_2D
extends Object

Computes 2D Discrete Cosine Transform (DCT) of single 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)

Author:
Piotr Wendykier (piotr.wendykier@gmail.com)

Constructor Summary
FloatDCT_2D(int rows, int columns)
          Creates new instance of FloatDCT_2D.
 
Method Summary
 void forward(float[][] a, boolean scale)
          Computes 2D forward DCT (DCT-II) leaving the result in a.
 void forward(float[] a, boolean scale)
          Computes 2D forward DCT (DCT-II) leaving the result in a.
 void inverse(float[][] a, boolean scale)
          Computes 2D inverse DCT (DCT-III) leaving the result in a.
 void inverse(float[] a, boolean scale)
          Computes 2D inverse DCT (DCT-III) leaving the result in a.
 
Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

FloatDCT_2D

public FloatDCT_2D(int rows,
                   int columns)
Creates new instance of FloatDCT_2D.

Parameters:
rows - number of rows
columns - number of columns
Method Detail

forward

public void forward(float[] a,
                    boolean scale)
Computes 2D forward DCT (DCT-II) leaving the result in a. The data is stored in 1D array in row-major order.

Parameters:
a - data to transform
scale - if true then scaling is performed

forward

public void forward(float[][] a,
                    boolean scale)
Computes 2D forward DCT (DCT-II) leaving the result in a. The data is stored in 2D array.

Parameters:
a - data to transform
scale - if true then scaling is performed

inverse

public void inverse(float[] a,
                    boolean scale)
Computes 2D inverse DCT (DCT-III) leaving the result in a. The data is stored in 1D array in row-major order.

Parameters:
a - data to transform
scale - if true then scaling is performed

inverse

public void inverse(float[][] a,
                    boolean scale)
Computes 2D inverse DCT (DCT-III) leaving the result in a. The data is stored in 2D array.

Parameters:
a - data to transform
scale - if true then scaling is performed

Parallel Colt 0.7.2

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