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diff --git a/extern/libmv/intern/detector.h b/extern/libmv/intern/detector.h
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+++ b/extern/libmv/intern/detector.h
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+/*
+ * ***** BEGIN GPL LICENSE BLOCK *****
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * The Original Code is Copyright (C) 2011 Blender Foundation.
+ * All rights reserved.
+ *
+ * Contributor(s): Blender Foundation,
+ *                 Sergey Sharybin
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+#ifndef LIBMV_C_API_DETECTOR_H_
+#define LIBMV_C_API_DETECTOR_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct libmv_Features libmv_Features;
+
+enum {
+  LIBMV_DETECTOR_FAST,
+  LIBMV_DETECTOR_MORAVEC,
+  LIBMV_DETECTOR_HARRIS,
+};
+
+typedef struct libmv_DetectOptions {
+  int detector;
+  int margin;
+  int min_distance;
+  int fast_min_trackness;
+  int moravec_max_count;
+  unsigned char *moravec_pattern;
+  double harris_threshold;
+} libmv_DetectOptions;
+
+libmv_Features* libmv_detectFeaturesByte(const unsigned char* image_buffer,
+                                         int width,
+                                         int height,
+                                         int channels,
+                                         libmv_DetectOptions* options);
+
+libmv_Features* libmv_detectFeaturesFloat(const float* image_buffer,
+                                          int width,
+                                          int height,
+                                          int channels,
+                                          libmv_DetectOptions* options);
+
+void libmv_featuresDestroy(libmv_Features* libmv_features);
+int libmv_countFeatures(const libmv_Features* libmv_features);
+void libmv_getFeature(const libmv_Features* libmv_features,
+                      int number,
+                      double* x,
+                      double* y,
+                      double* score,
+                      double* size);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif  // LIBMV_C_API_DETECTOR_H_