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+/*
+ * GStreamer
+ * Copyright (C) <2017> Philippe Renon <philippe_renon@yahoo.fr>
+ * 
+ * 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.
+ *
+ * Alternatively, the contents of this file may be used under the
+ * GNU Lesser General Public License Version 2.1 (the "LGPL"), in
+ * which case the following provisions apply instead of the ones
+ * mentioned above:
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef __GST_CAMERA_CALIBRATE_H__
+#define __GST_CAMERA_CALIBRATE_H__
+
+#include <gst/gst.h>
+
+#include <gst/opencv/gstopencvvideofilter.h>
+
+#include <opencv2/core.hpp>
+
+G_BEGIN_DECLS
+
+#define GST_TYPE_CAMERA_CALIBRATE \
+  (gst_camera_calibrate_get_type())
+#define GST_CAMERA_CALIBRATE(obj) \
+  (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_CAMERA_CALIBRATE,GstCameraCalibrate))
+#define GST_CAMERA_CALIBRATE_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_CAMERA_CALIBRATE,GstCameraCalibrateClass))
+#define GST_IS_CAMERA_CALIBRATE(obj) \
+  (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_CAMERA_CALIBRATE))
+#define GST_IS_CAMERA_CALIBRATE_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_CAMERA_CALIBRATE))
+typedef struct _GstCameraCalibrate GstCameraCalibrate;
+typedef struct _GstCameraCalibrateClass GstCameraCalibrateClass;
+
+enum _GstCameraCalibrationPattern {
+    GST_CAMERA_CALIBRATION_PATTERN_CHESSBOARD,
+    GST_CAMERA_CALIBRATION_PATTERN_CIRCLES_GRID,
+    GST_CAMERA_CALIBRATION_PATTERN_ASYMMETRIC_CIRCLES_GRID
+};
+
+struct _GstCameraCalibrate
+{
+  GstOpencvVideoFilter cvfilter;
+  
+  // settings
+  gint calibrationPattern;     // One of the chessboard, circles, or asymmetric circle pattern
+  cv::Size boardSize;          // The size of the board -> Number of items by width and height
+  float squareSize;            // The size of a square in your defined unit (point, millimeter,etc).
+  float aspectRatio;           // The aspect ratio
+  bool cornerSubPix;           //
+  bool calibZeroTangentDist;   // Assume zero tangential distortion
+  bool calibFixPrincipalPoint; // Fix the principal point at the center
+  bool useFisheye;             // use fisheye camera model for calibration
+  int nrFrames;                // The number of frames to use from the input for calibration
+  int delay;                   // In case of a video input
+  bool showUndistorsed;        // Show undistorted images after calibration
+  bool showCorners;            // Show corners
+
+  // state
+  int flags;
+  int mode;
+  clock_t prevTimestamp;
+  std::vector<std::vector<cv::Point2f> > imagePoints;
+  cv::Mat cameraMatrix, distCoeffs;
+
+  // opaque string containing opencv calibration settings
+  gchar *settings;
+};
+
+struct _GstCameraCalibrateClass
+{
+  GstOpencvVideoFilterClass parent_class;
+};
+
+GType gst_camera_calibrate_get_type (void);
+
+GST_ELEMENT_REGISTER_DECLARE (cameracalibrate);
+
+G_END_DECLS
+#endif /* __GST_CAMERA_CALIBRATE_H__ */