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diff --git a/extern/libmv/libmv/tracking/esm_region_tracker.h b/extern/libmv/libmv/tracking/esm_region_tracker.h
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+// Copyright (c) 2007, 2008, 2009, 2011 libmv authors.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to
+// deal in the Software without restriction, including without limitation the
+// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+// sell copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+// IN THE SOFTWARE.
+
+#ifndef LIBMV_REGION_TRACKING_LMICKLT_REGION_TRACKER_H_
+#define LIBMV_REGION_TRACKING_LMICKLT_REGION_TRACKER_H_
+
+#include "libmv/image/image.h"
+#include "libmv/tracking/region_tracker.h"
+
+namespace libmv {
+
+/*!
+    A translation-only Efficient Second-order Minimization ("ESM") tracker
+
+    Based on the paper "Real-time image-based trackiing of planes using
+    Efficient Second-order Minimization"
+*/
+struct EsmRegionTracker : public RegionTracker {
+  EsmRegionTracker()
+      : half_window_size(4),
+        max_iterations(16),
+        min_determinant(1e-6),
+        min_update_squared_distance(1e-4),
+        sigma(0.9) {}
+  
+  virtual ~EsmRegionTracker() {}
+
+  // Tracker interface.
+  virtual bool Track(const FloatImage &image1,
+                     const FloatImage &image2,
+                     double  x1, double  y1,
+                     double *x2, double *y2) const;
+
+  // No point in creating getters or setters.
+  int half_window_size;
+  int max_iterations;
+  double min_determinant;
+  double min_update_squared_distance;
+  double sigma;
+};
+
+}  // namespace libmv
+
+#endif  // LIBMV_REGION_TRACKING_LMICKLT_REGION_TRACKER_H_