features.filterBanks
Class RadialGaussianDerivative

java.lang.Object
  features.filterBanks.FilterBank
      features.filterBanks.GaussianDerivative
          features.filterBanks.RadialGaussianDerivative

public class RadialGaussianDerivative
extends GaussianDerivative

This class implements a filterbank for radially oriented GaussianDerivative Oriented Filter. It implements a super-convolver which with one method call computes multiple convolutions of an image with radial Gaussian derivative kernel at order, scale, and angle. A radial filter can be 0, 1, 2nd order, and is calculated radially only. Copyright (c) 1999-2005, Michael Abramoff. All rights reserved.

Field Summary

Fields inherited from class features.filterBanks.FilterBank

OPPONENCIES

Constructor Summary

RadialGaussianDerivative(float[] scales, int nrOrders, int[] channels)

Method Summary

Feature	filter(int filternumber, int[] image, int width, java.lang.String extraText) Apply a filter to the image.
int	getNumber() Return the number of filters in this filter bank.
java.lang.String	name(int filternumber, java.lang.String preString) Return a descriptive String for this filternumber.
float[]	R(float[] image, int width, int n, double scale, boolean radial) Compute a radial L filter of order, scale and orientation.

Methods inherited from class features.filterBanks.GaussianDerivative

L

Methods inherited from class features.filterBanks.FilterBank

scaleSet, thetaSet

Methods inherited from class java.lang.Object

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

Constructor Detail

RadialGaussianDerivative

public RadialGaussianDerivative(float[] scales,
                                int nrOrders,
                                int[] channels)

Method Detail

getNumber

public int getNumber()

Return the number of filters in this filter bank.

Overrides:

getNumber in class GaussianDerivative

name

public java.lang.String name(int filternumber,
                             java.lang.String preString)

Description copied from class: GaussianDerivative

Return a descriptive String for this filternumber.

Overrides:

name in class GaussianDerivative

filter

public Feature filter(int filternumber,
                      int[] image,
                      int width,
                      java.lang.String extraText)

Apply a filter to the image. The filter is determined by the filternumber which indicates which scale, order and orientation to use. filternumber is a consecutive number that identifies a filter with a specific scale, derivative order and orientation.

Overrides:

filter in class GaussianDerivative

R

public float[] R(float[] image,
                 int width,
                 int n,
                 double scale,
                 boolean radial)

Compute a radial L filter of order, scale and orientation.

Parameters:

image - the image

width - the width of image in pixels.

n - the order of the derivatives

scale - the scale of the GaussianDerivative used to compute the derivatives.

radial - the direction of the derivative, either radial or tangential.

Returns:

a float[][] with the resulting convolution.