boofcv.alg.transform.wavelet

Class UtilWavelet

java.lang.Object

boofcv.alg.transform.wavelet.UtilWavelet

public class UtilWavelet
extends Object

Various functions which are useful when working with or computing wavelet transforms.

Author:

Peter Abeles

Constructor Summary

Constructors

Constructor and Description
UtilWavelet()

Method Summary

Methods

Modifier and Type	Method and Description
static void	adjustForDisplay(ImageSingleBand transform, int numLevels, double valueRange) Adjusts the values inside a wavelet transform to make it easier to view.
static int	borderForwardLower(WlCoef desc) Returns the lower border for a forward wavelet transform.
static int	borderForwardUpper(WlCoef desc, int dataLength) Returns the upper border (offset from image edge) for a forward wavelet transform.
static int	borderInverseLower(WlBorderCoef<?> desc, BorderIndex1D border) Returns the lower border for an inverse wavelet transform.
static int	borderInverseUpper(WlBorderCoef<?> desc, BorderIndex1D border, int dataLength) Returns the upper border (offset from image edge) for an inverse wavelet transform.
static int	checkInverseLower(WlCoef coef, int index, BorderIndex1D border, int current)
static int	checkInverseUpper(WlCoef coef, int index, BorderIndex1D border, int current)
static void	checkShape(ImageSingleBand original, ImageSingleBand transformed) The original image can have an even or odd number of width/height.
static void	checkShape(WlCoef desc, ImageSingleBand original, ImageSingleBand transformed, int level)
static int	computeDiv(int level) Returns the number that the output image needs to be divisible by.
static double	computeEnergy(float[] array) Compute the energy of the specified array.
static double	computeEnergy(int[] array, int denominator) Compute the energy of the specified array.
static int	computeScale(int level)
static BorderType	convertToType(BorderIndex1D b)
static int	round(int top, int div2, int divisor) Specialized rounding for use with integer wavelet transform.
static double	sumCoefficients(float[] array)
static int	sumCoefficients(int[] array)
static ImageDimension	transformDimension(ImageBase orig, int level) Returns dimension which is required for the transformed image in a multilevel wavelet transform.
static ImageDimension	transformDimension(int width, int height, int level)

Methods inherited from class java.lang.Object

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

Constructor Detail

UtilWavelet

public UtilWavelet()

Method Detail

checkShape

public static void checkShape(ImageSingleBand original,
              ImageSingleBand transformed)

The original image can have an even or odd number of width/height. While the transformed image must have an even number of pixels. If the original image is even then the sames are the same, otherwise the transformed image's shape is rounded up.

Parameters:

original - Original input image.

transformed - Image which has been transformed.

checkShape

public static void checkShape(WlCoef desc,
              ImageSingleBand original,
              ImageSingleBand transformed,
              int level)

computeScale

public static int computeScale(int level)

computeDiv

public static int computeDiv(int level)

Returns the number that the output image needs to be divisible by.

transformDimension

public static ImageDimension transformDimension(ImageBase orig,
                                int level)

Returns dimension which is required for the transformed image in a multilevel wavelet transform.

transformDimension

public static ImageDimension transformDimension(int width,
                                int height,
                                int level)

computeEnergy

public static double computeEnergy(float[] array)

Compute the energy of the specified array.

E = sum( i=1..N , a[i]*a[i] )

computeEnergy

public static double computeEnergy(int[] array,
                   int denominator)

Compute the energy of the specified array.

E = sum( i=1..N , a[i]*a[i] ) / (N*d*d)

sumCoefficients

public static double sumCoefficients(float[] array)

sumCoefficients

public static int sumCoefficients(int[] array)

borderForwardLower

public static int borderForwardLower(WlCoef desc)

Returns the lower border for a forward wavelet transform.

borderForwardUpper

public static int borderForwardUpper(WlCoef desc,
                     int dataLength)

Returns the upper border (offset from image edge) for a forward wavelet transform.

borderInverseLower

public static int borderInverseLower(WlBorderCoef<?> desc,
                     BorderIndex1D border)

Returns the lower border for an inverse wavelet transform.

checkInverseLower

public static int checkInverseLower(WlCoef coef,
                    int index,
                    BorderIndex1D border,
                    int current)

borderInverseUpper

public static int borderInverseUpper(WlBorderCoef<?> desc,
                     BorderIndex1D border,
                     int dataLength)

Returns the upper border (offset from image edge) for an inverse wavelet transform.

checkInverseUpper

public static int checkInverseUpper(WlCoef coef,
                    int index,
                    BorderIndex1D border,
                    int current)

round

public static int round(int top,
        int div2,
        int divisor)

Specialized rounding for use with integer wavelet transform. return (top +- div2) / divisor;

Parameters:

top - Top part of the equation.

div2 - The divisor divided by two.

divisor - The divisor.

Returns:

convertToType

public static BorderType convertToType(BorderIndex1D b)

adjustForDisplay

public static void adjustForDisplay(ImageSingleBand transform,
                    int numLevels,
                    double valueRange)

Adjusts the values inside a wavelet transform to make it easier to view.

Parameters:

transform -

numLevels - Number of levels in the transform