vector_aggregation
Class VladAggregatorMean

java.lang.Object
  vector_aggregation.AbstractFeatureAggregator
      vector_aggregation.VladAggregatorMean

public class VladAggregatorMean
extends AbstractFeatureAggregator

This class computes raw VLAD vectors with mean instead of sum aggregation. The produced vectors should be power and L2 normalized afterwards.

Author:

Eleftherios Spyromitros-Xioufis

Field Summary

Fields inherited from class vector_aggregation.AbstractFeatureAggregator

codebook, descriptorLength, numCentroids, vectorLength

Constructor Summary

VladAggregatorMean(double[][] codebook)
The default constructor calls the super constructor.

Method Summary

double[]	aggregateInternal(java.util.ArrayList<double[]> descriptors) Takes as input an ArrayList of double arrays which contains the set of local descriptors for an image.
double[]	aggregateInternal(double[][] descriptors) Takes as input 2-dimensional double array which contains the set of local descriptors for an image.
int	getVectorLength() Should compute and return the length of the generated vector.

Methods inherited from class vector_aggregation.AbstractFeatureAggregator

aggregate, aggregate, computeKNearestCentroids, computeNearestCentroid, computeNearestCentroidIndexAndDistance, getDescriptorLength, getNumCentroids, readCodebookFile, setDescriptorLength, setNumCentroids

Methods inherited from class java.lang.Object

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

Constructor Detail

VladAggregatorMean

public VladAggregatorMean(double[][] codebook)

The default constructor calls the super constructor.

Parameters:

codebook -

Method Detail

aggregateInternal

public double[] aggregateInternal(double[][] descriptors)

Takes as input 2-dimensional double array which contains the set of local descriptors for an image. Returns the VLAD vector representation of the image using the codebook supplied in the constructor.

Specified by:

aggregateInternal in class AbstractFeatureAggregator

Parameters:

descriptors -

Returns:

Throws:

java.lang.Exception

aggregateInternal

public double[] aggregateInternal(java.util.ArrayList<double[]> descriptors)

Takes as input an ArrayList of double arrays which contains the set of local descriptors for an image. Returns the VLAD vector representation of the image using the codebook supplied in the constructor.

Specified by:

aggregateInternal in class AbstractFeatureAggregator

Parameters:

descriptors -

Returns:

Throws:

java.lang.Exception

getVectorLength

public int getVectorLength()

Description copied from class: AbstractFeatureAggregator

Should compute and return the length of the generated vector.

Specified by:

getVectorLength in class AbstractFeatureAggregator

Returns: