Peter M. Groen / openbr

Commit 2a3fcf3d4321a47654df57dff5620a6cdd9a7c0d

Authored by jklontz
2 parents bd7a2f64 e48e4411

Merge pull request #68 from biometrics/onlineDistance 

Online distance metric added
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Showing 1 changed file with 28 additions and 1 deletions
openbr/plugins/distance.cpp
  View file @2a3fcf3
... ... @@ -298,6 +298,33 @@ class IdenticalDistance : public Distance
298 298  
299 299 BR_REGISTER(Distance, IdenticalDistance)
300 300  
301   -} // namespace br
302 301  
  302 +/*!
  303 + * \ingroup distances
  304 + * \brief Online distance metric to attenuate match scores across multiple frames
  305 + * \author Brendan klare \cite bklare
  306 + */
  307 +class OnlineDistance : public Distance
  308 +{
  309 + Q_OBJECT
  310 + Q_PROPERTY(br::Distance* distance READ get_distance WRITE set_distance RESET reset_distance STORED false)
  311 + Q_PROPERTY(float alpha READ get_alpha WRITE set_alpha RESET reset_alpha STORED false)
  312 + BR_PROPERTY(br::Distance*, distance, NULL)
  313 + BR_PROPERTY(float, alpha, 0.1f);
  314 +
  315 + mutable QHash<QString,float> scoreHash;
  316 + mutable QMutex mutex;
  317 +
  318 + float compare(const Template &target, const Template &query) const
  319 + {
  320 + float currentScore = distance->compare(target, query);
  321 +
  322 + QMutexLocker mutexLocker(&mutex);
  323 + return scoreHash[target.file.name] = (1.0- alpha) * scoreHash[target.file.name] + alpha * currentScore;
  324 + }
  325 +};
  326 +
  327 +BR_REGISTER(Distance, OnlineDistance)
  328 +
  329 +} // namespace br
303 330 #include "distance.moc"
... ...