Added online distance function

Brendan Klare
1 parent 3aa2be93
Showing 1 changed file with 28 additions and 1 deletions
openbr/plugins/distance.cpp
@@ -298,7 +298,34 @@ class IdenticalDistance : public Distance
 BR_REGISTER(Distance, IdenticalDistance)
-} // namespace br
+/*!
+ * \ingroup distances
+ * \brief Online distance metric to attenuate match scores across multiple frames
+ * \author Brendan klare \cite bklare
+ */
+class OnlineDistance : public Distance
+{
+    Q_OBJECT
+    Q_PROPERTY(br::Distance* distance READ get_distance WRITE set_distance RESET reset_distance STORED false)
+    Q_PROPERTY(float alpha READ get_alpha WRITE set_alpha RESET reset_alpha STORED false)
+    BR_PROPERTY(br::Distance*, distance, NULL)
+    BR_PROPERTY(float, alpha, 0.1f);
+
+    mutable QHash<QString,float> scoreHash;
+    mutable QMutex mutex;
+
+    float compare(const Template &target, const Template &query) const
+    {
+        float currentScore = distance->compare(target, query);
+
+        QMutexLocker mutexLocker(&mutex);
+        if (!scoreHash.contains(target.file.name))      scoreHash[target.file.name] = 0.0f; 
+        return (1.0- alpha) * scoreHash[target.file.name] + alpha * currentScore;
+    }
+};
+BR_REGISTER(Distance, OnlineDistance)
+
+} // namespace br
 #include "distance.moc"