GiciTransform
Class ForwardWaveletTransform

java.lang.Object
  GiciTransform.ForwardWaveletTransform

public class ForwardWaveletTransform
extends java.lang.Object

This class receives an image and performs applies a discrete wavelet transform.
Usage example:
construct
setParameters
run

Version:

1.0

Author:

Group on Interactive Coding of Images (GICI)

Field Summary

(package private) float[][][]	imageSamples Definition in Coder
(package private) boolean	parametersSet To know if parameters are set.
(package private) int[]	WTLevels DWT levels to apply for each component.
(package private) int[]	WTOrder To know the order of the transform in the spatial dimentions for each component
(package private) int[]	WTTypes Discrete wavelet transform to be applied for each component.
(package private) int	xSize Definition in Coder
(package private) int	ySize Definition in Coder
(package private) int	zSize Definition in Coder

Constructor Summary

ForwardWaveletTransform(float[][][] imageSamples)
Constructor that receives the original image samples.

Method Summary

private float[]	evenFiltering(float[] src, int z) This function applies the DWT filter to a source with even length.
private float[]	filtering(float[] src, int z) This function selects the way to apply the filter selected depending on the size of the source
private float[]	oddFiltering(float[] src, int z) This function applies the DWT filter to a source with odd length.
float[][][]	run() Performs the discrete wavelete transform and returns the result image.
void	setParameters(int[] WTTypes, int[] WTLevels) Set the parameters used to apply the discrete wavelet transform, the order is set and cannot be selected..
void	setParameters(int[] WTTypes, int[] WTLevels, int[] WTOrder) Set the parameters used to apply the discrete wavelet transform when the order of the spatial dimentions can be chosen.

Methods inherited from class java.lang.Object

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

Field Detail

imageSamples

float[][][] imageSamples

Definition in Coder

zSize

int zSize

Definition in Coder

ySize

int ySize

Definition in Coder

xSize

int xSize

Definition in Coder

WTTypes

int[] WTTypes

Discrete wavelet transform to be applied for each component.

Valid values are:

• 0 - None
• 1 - Reversible 5/3 DWT (JPEG2000)
• 2 - Real Isorange (Irreversible) 9/7 DWT (JPEG2000 standard)
• 3 - Real Isonorm (Irreversible) 9/7 DWT (CCSDS-Recommended)
• 4 - Integer (Reversible) 9/7M DWT (CCSDS-Recommended)
• 5 - Integer 5/3 DWT (Classic construction)
• 6 - Integer 9/7 DWT (Classic construction)

WTLevels

int[] WTLevels

DWT levels to apply for each component.

Negative values not allowed.

WTOrder

int[] WTOrder

To know the order of the transform in the spatial dimentions for each component

Valid values are:

• 0 - Horizontal - Verical
• 1 - Vertical - Horizontal
• 2 - Only horizontal

parametersSet

boolean parametersSet

To know if parameters are set.

True indicates that they are set otherwise false.

Constructor Detail

ForwardWaveletTransform

public ForwardWaveletTransform(float[][][] imageSamples)

Constructor that receives the original image samples.

Parameters:

imageSamples - definition in Coder

Method Detail

setParameters

public void setParameters(int[] WTTypes,
                          int[] WTLevels)

Set the parameters used to apply the discrete wavelet transform, the order is set and cannot be selected..

Parameters:

WTTypes - definition in WTTypes

WTLevels - definition in WTLevels

setParameters

public void setParameters(int[] WTTypes,
                          int[] WTLevels,
                          int[] WTOrder)

Set the parameters used to apply the discrete wavelet transform when the order of the spatial dimentions can be chosen.

Parameters:

WTTypes - definition in WTTypes

WTLevels - definition in WTLevels

WTOrder - definition in WTOrder

run

public float[][][] run()
                throws ErrorException

Performs the discrete wavelete transform and returns the result image.

Returns:

the DWT image

Throws:

ErrorException - when parameters are not set or wavelet type is unrecognized

filtering

private float[] filtering(float[] src,
                          int z)
                   throws ErrorException

This function selects the way to apply the filter selected depending on the size of the source

Parameters:

src - a float array of the image samples

z - the component determines the filter to apply

Returns:

a float array that contains the tranformed sources

Throws:

ErrorException - when wavelet type is unrecognized

evenFiltering

private float[] evenFiltering(float[] src,
                              int z)
                       throws ErrorException

This function applies the DWT filter to a source with even length.

Parameters:

src - a float array of the image samples

z - the component determines the filter to apply

Returns:

a float array that contains the tranformed sources

Throws:

ErrorException - when wavelet type is unrecognized or size is not proper

oddFiltering

private float[] oddFiltering(float[] src,
                             int z)
                      throws ErrorException

This function applies the DWT filter to a source with odd length.

Parameters:

src - a float array of the image samples

z - the component determines the filter to apply

Returns:

a float array that contains the tranformed sources

Throws:

ErrorException - when wavelet type is unrecognized or size is not proper