vector_aggregation
Class BowAggregator

java.lang.Object
  vector_aggregation.AbstractFeatureAggregator
      vector_aggregation.BowAggregator

public class BowAggregator
extends AbstractFeatureAggregator

This class computes raw BOW vectors. The produced vectors should be (optionally) power and L2 normalized afterwards.

Author:

Eleftherios Spyromitros-Xioufis

Field Summary

private int

k The number of centroids where each descriptor is quantized.

Fields inherited from class vector_aggregation.AbstractFeatureAggregator

codebook, descriptorLength, numCentroids, vectorLength

Constructor Summary

BowAggregator(double[][] codebook)

BowAggregator(double[][] codebook, int k)

Method Summary

protected double[]	aggregateInternal(java.util.ArrayList<double[]> descriptors) This method should be overridden by all aggregators.
protected double[]	aggregateInternal(double[][] descriptors) This method should be overridden by all aggregators.
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

Field Detail

k

private int k

The number of centroids where each descriptor is quantized. Default = 1 means hard quantization.

Constructor Detail

BowAggregator

public BowAggregator(double[][] codebook)

BowAggregator

public BowAggregator(double[][] codebook,
                     int k)

Method Detail

aggregateInternal

protected double[] aggregateInternal(double[][] descriptors)
                              throws java.lang.Exception

Description copied from class: AbstractFeatureAggregator

This method should be overridden by all aggregators.

Specified by:

aggregateInternal in class AbstractFeatureAggregator

Returns:

Throws:

java.lang.Exception

aggregateInternal

protected double[] aggregateInternal(java.util.ArrayList<double[]> descriptors)
                              throws java.lang.Exception

Description copied from class: AbstractFeatureAggregator

This method should be overridden by all aggregators.

Specified by:

aggregateInternal in class AbstractFeatureAggregator

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: