quality.cpp
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#include <openbr_plugin.h>
#include "core/common.h"
using namespace br;
namespace br
{
/*!
* \ingroup transforms
* \brief Impostor Uniqueness Measure \cite klare12
* \author Josh Klontz \cite jklontz
*/
class IUMTransform : public Transform
{
Q_OBJECT
Q_PROPERTY(br::Distance* distance READ get_distance WRITE set_distance RESET reset_distance STORED false)
Q_PROPERTY(double mean READ get_mean WRITE set_mean RESET reset_mean)
Q_PROPERTY(double stddev READ get_stddev WRITE set_stddev RESET reset_stddev)
BR_PROPERTY(br::Distance*, distance, Factory<Distance>::make(".Dist(L2)"))
BR_PROPERTY(double, mean, 0)
BR_PROPERTY(double, stddev, 1)
br::TemplateList impostors;
float calculateIUM(const Template &probe, const TemplateList &gallery) const
{
QList<float> scores = distance->compare(gallery, probe);
float min, max;
Common::MinMax(scores, &min, &max);
double mean;
Common::Mean(scores, &mean);
return (max-mean)/(max-min);
}
void train(const TemplateList &data)
{
distance->train(data);
impostors = data;
QList<float> iums; iums.reserve(impostors.size());
QList<int> labels = impostors.labels<int>();
for (int i=0; i<data.size(); i++) {
TemplateList subset = impostors;
for (int j=subset.size()-1; j>=0; j--)
if (labels[j] == labels[i])
subset.removeAt(j);
iums.append(calculateIUM(impostors[i], subset));
}
Common::MeanStdDev(iums, &mean, &stddev);
}
void project(const Template &src, Template &dst) const
{
dst = src;
float ium = calculateIUM(src, impostors);
dst.file.insert("IUM", ium);
dst.file.insert("IUM_Bin", ium < mean-stddev ? 0 : (ium < mean+stddev ? 1 : 2));
}
void store(QDataStream &stream) const
{
distance->store(stream);
stream << mean << stddev << impostors;
}
void load(QDataStream &stream)
{
distance->load(stream);
stream >> mean >> stddev >> impostors;
}
};
BR_REGISTER(Transform, IUMTransform)
} // namespace br
#include "quality.moc"