imagingbook.pub.dct

Class Dct1d

java.lang.Object

imagingbook.pub.dct.Dct1d

public class Dct1d
extends Object

This class calculates the 1D DFT using tabulated cosine values. This version is considerably faster than the original without tables. Other optimizations are possible.

Version:

2015-07-29

Constructor Summary

Constructors

Constructor and Description
Dct1d(int M)

Method Summary

Modifier and Type	Method and Description
void	DCT(double[] g) Performs the 1D forward discrete cosine transform.
void	iDCT(double[] G) Performs the 1D inverse discrete cosine transform.
static void	main(String[] args)

Methods inherited from class java.lang.Object

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

Constructor Detail

Dct1d

public Dct1d(int M)

Method Detail

DCT

public void DCT(double[] g)

Performs the 1D forward discrete cosine transform. Destructively applies the forward Discrete Cosine Transform to the argument vector.

Parameters:

g - the data to be transformed

iDCT

public void iDCT(double[] G)

Performs the 1D inverse discrete cosine transform. Destructively applies the inverse Discrete Cosine Transform to the argument vector.

Parameters:

G - the data to be transformed

main

public static void main(String[] args)