feature_extraction
Class SURFExtractor

java.lang.Object
  feature_extraction.DescriptorExtractor
      feature_extraction.SURFExtractor

public class SURFExtractor
extends DescriptorExtractor

This class implements SURF feature extraction using the BoofCV library.

Author:

Eleftherios Spyromitros-Xioufis

Field Summary

private int	maxFeaturesPerScale The maximum features extracted per scale.
private int	minFeatureIntensity The minimum intensity threshold.
private boolean	modified The type of SURF to extract.

Fields inherited from class feature_extraction.DescriptorExtractor

l2Normalization, powerNormalization, SIFTLength, SURFLength, totalNumberInterestPoints

Constructor Summary

SURFExtractor()

SURFExtractor(int maxFeaturesPerScale, int minFeatureIntensity, boolean modified)

Method Summary

private double[][]	easy(boofcv.struct.image.ImageFloat32 image) Use generalized interfaces for working with SURF.
double[][]	extractDescriptorsInternal(java.awt.image.BufferedImage image) Detects key points inside the image and computes descriptions at those points.

Methods inherited from class feature_extraction.DescriptorExtractor

extractDescriptors, getTotalExtractionTime, getTotalNumberInterestPoints, setL2Normalization, setPowerNormalization

Methods inherited from class java.lang.Object

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

Field Detail

modified

private boolean modified

The type of SURF to extract. If true the slower-more stable method is used instead of the faster-less stable.

maxFeaturesPerScale

private int maxFeaturesPerScale

The maximum features extracted per scale.

minFeatureIntensity

private int minFeatureIntensity

The minimum intensity threshold.

Constructor Detail

SURFExtractor

public SURFExtractor()
              throws java.lang.Exception

Throws:

java.lang.Exception

SURFExtractor

public SURFExtractor(int maxFeaturesPerScale,
                     int minFeatureIntensity,
                     boolean modified)
              throws java.lang.Exception

Throws:

java.lang.Exception

Method Detail

extractDescriptorsInternal

public double[][] extractDescriptorsInternal(java.awt.image.BufferedImage image)
                                      throws java.lang.Exception

Detects key points inside the image and computes descriptions at those points.

Specified by:

extractDescriptorsInternal in class DescriptorExtractor

Throws:

java.lang.Exception

easy

private double[][] easy(boofcv.struct.image.ImageFloat32 image)

Use generalized interfaces for working with SURF. This removes much of the drudgery, but also reduces flexibility and slightly increases memory and computational requirements.

Parameters:

image - Input image type. DOES NOT NEED TO BE ImageFloat32, ImageUInt8 works too