features.filterBanks
Class Gabor

java.lang.Object
  features.filterBanks.FilterBank
      features.filterBanks.Gabor

public class Gabor
extends FilterBank

This class implements a filterbank for Gabor wavelet convolution for channel images. It uses three physiologically plausible Channel spaces: bright-dark, red-green and yellow-blue. It implements a super-convolver which with one method call computes multiple convolutions of an image with Gabors of different scale, frequency, orientation and phase. Copyright (c) 1999-2005, Michael Abramoff. All rights reserved.

Field Summary

Fields inherited from class features.filterBanks.FilterBank

OPPONENCIES

Constructor Summary

Gabor(float[] scales, float[] orientations)

Gabor(float[] scales, float[] orientations, int[] channels)

Method Summary

Feature	filter(int filternumber, int[] image, int width, java.lang.String extraText) Apply a filter to the image.
float[]	gabor(float[] image, int width, double s, double w, double phi, double orientation) Convolve image with a Gabor cosine filter with scale s, frequency w, phase phi and orientation o.
int	getNumber() Return the number of filters in this filter bank.
static java.lang.String	name(double scale, double orientation, double omega, double phi, int color, java.lang.String extraText)
java.lang.String	name(int filternumber, java.lang.String preString) Get the feature name for filternumber.

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

Gabor

public Gabor(float[] scales,
             float[] orientations,
             int[] channels)

Gabor

public Gabor(float[] scales,
             float[] orientations)

Method Detail

getNumber

public int getNumber()

Return the number of filters in this filter bank.

Specified by:

getNumber in class FilterBank

name

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

Description copied from class: FilterBank

Get the feature name for filternumber.

Specified by:

name in class FilterBank

name

public static java.lang.String name(double scale,
                                    double orientation,
                                    double omega,
                                    double phi,
                                    int color,
                                    java.lang.String extraText)

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, and orientation to use. filternumber is a consecutive number that identifies a filter with a specific scale, derivative order and orientation.

gabor

public float[] gabor(float[] image,
                     int width,
                     double s,
                     double w,
                     double phi,
                     double orientation)

Convolve image with a Gabor cosine filter with scale s, frequency w, phase phi and orientation o.

Parameters:

image - float[] the image

width - int the width of image in pixels.

s - double the scale of the Gaussian used to compute the Gabor wavelet

w - double the frequency of the cosine.

phi - double the phase of the cosine

Returns:

float []