diff --git a/openbr/plugins/distance.cpp b/openbr/plugins/distance.cpp
index 8781197..7f0cf71 100644
--- a/openbr/plugins/distance.cpp
+++ b/openbr/plugins/distance.cpp
@@ -298,6 +298,33 @@ 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);
+        return scoreHash[target.file.name] = (1.0- alpha) * scoreHash[target.file.name] + alpha * currentScore;
+    }
+};
+
+BR_REGISTER(Distance, OnlineDistance)
+
+} // namespace br
 #include "distance.moc"
diff --git a/openbr/plugins/misc.cpp b/openbr/plugins/misc.cpp
index f872f1a..4ae217a 100644
--- a/openbr/plugins/misc.cpp
+++ b/openbr/plugins/misc.cpp
@@ -35,6 +35,7 @@ class OpenTransform : public UntrainableMetaTransform
 
     void project(const Template &src, Template &dst) const
     {
+        if (!src.isEmpty()) { dst = src; return; }
         if (Globals->verbose) qDebug("Opening %s", qPrintable(src.file.flat()));
         dst.file = src.file;
         foreach (const File &file, src.file.split()) {
diff --git a/openbr/plugins/pp5.cpp b/openbr/plugins/pp5.cpp
index e79ee92..658a0d8 100644
--- a/openbr/plugins/pp5.cpp
+++ b/openbr/plugins/pp5.cpp
@@ -305,10 +305,14 @@ class PP5CompareDistance : public Distance
 
     float compare(const Template &target, const Template &query) const
     {
-        (void) target;
-        (void) query;
-        qFatal("Compare single templates should never be called!");
-        return 0;
+        TemplateList targetList;
+        targetList.append(target);
+        TemplateList queryList;
+        queryList.append(query);
+        MatrixOutput *score = MatrixOutput::make(targetList.files(), queryList.files());
+        compare(targetList, queryList, score);
+        return score->data.at<float>(0);
+
     }
 
     void compare(const TemplateList &target, const TemplateList &query, Output *output) const