diff --git a/sdk/openbr_plugin.cpp b/sdk/openbr_plugin.cpp
index f8a4ea0..f91fc90 100644
--- a/sdk/openbr_plugin.cpp
+++ b/sdk/openbr_plugin.cpp
@@ -606,6 +606,7 @@ br::Context::Context()
     quiet = verbose = false;
     currentStep = totalSteps = 0;
     enrollAll = false;
+    backProject = false;
 }
 
 int br::Context::blocks(int size) const
@@ -1046,6 +1047,8 @@ private:
         }
     }
 
+
+
     void store(QDataStream &stream) const
     {
         const int size = transforms.size();
@@ -1154,6 +1157,12 @@ void Transform::project(const TemplateList &src, TemplateList &dst) const
     if (Globals->parallelism) Globals->trackFutures(futures);
 }
 
+void Transform::backProject(const Template &dst, Template &src) const
+{
+    src = dst;
+}
+
+
 /* Distance - public methods */
 void Distance::train(const TemplateList &templates)
 {
diff --git a/sdk/openbr_plugin.h b/sdk/openbr_plugin.h
index 2ba1cd6..08f008b 100644
--- a/sdk/openbr_plugin.h
+++ b/sdk/openbr_plugin.h
@@ -449,6 +449,13 @@ public:
     BR_PROPERTY(int, parallelism, 0)
 
     /*!
+     * \brief true if backProject should be used instead of project (the algorithm should be inverted)
+     */
+    Q_PROPERTY(bool backProject READ get_backProject WRITE set_backProject RESET reset_backProject)
+    BR_PROPERTY(bool, backProject, false)
+
+
+    /*!
      * \brief If \c true no messages will be sent to the terminal, \c false by default.
      */
     Q_PROPERTY(bool quiet READ get_quiet WRITE set_quiet RESET reset_quiet)
@@ -905,6 +912,9 @@ public:
     virtual void train(const TemplateList &data) = 0; /*!< \brief Train the transform. */
     virtual void project(const Template &src, Template &dst) const = 0; /*!< \brief Apply the transform. */
     virtual void project(const TemplateList &src, TemplateList &dst) const; /*!< \brief Apply the transform. */
+    virtual void backProject(const Template &dst, Template &src) const; /*!< \brief Invert the transform. */
+
+
 
     /*!
      * \brief Convenience function equivalent to project().
@@ -930,6 +940,7 @@ public:
 protected:
     Transform(bool independent = true); /*!< \brief Construct a transform. */
     inline Transform *make(const QString &description) { return make(description, this); } /*!< \brief Make a subtransform. */
+
 };
 
 /*!
@@ -996,6 +1007,7 @@ private:
     void load(QDataStream &stream) { (void) stream; }
 };
 
+
 /*!
  * \brief A br::MetaTransform that does not require training data.
  */
@@ -1043,7 +1055,7 @@ private:
 * \brief Returns \c true if the algorithm is a classifier, \c false otherwise.
 *
 * Classifers have no br::Distance associated with their br::Transform.
-* Instead they populate br::Template::file \c Label metadata fielf with the predicted class.
+* Instead they populate br::Template::file \c Label metadata field with the predicted class.
 */
 BR_EXPORT bool IsClassifier(const QString &algorithm);