COpenNI2_RGBD360.h

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/* +---------------------------------------------------------------------------+
   |                     Mobile Robot Programming Toolkit (MRPT)               |
   |                          http://www.mrpt.org/                             |
   |                                                                           |
   | Copyright (c) 2005-2017, Individual contributors, see AUTHORS file        |
   | See: http://www.mrpt.org/Authors - All rights reserved.                   |
   | Released under BSD License. See details in http://www.mrpt.org/License    |
   +---------------------------------------------------------------------------+ */
#ifndef mrpt_OPENNI2_RGBD360_H
#define mrpt_OPENNI2_RGBD360_H

#include <mrpt/hwdrivers/COpenNI2Generic.h>
#include <mrpt/hwdrivers/CGenericSensor.h>
#include <mrpt/obs/CObservationRGBD360.h>
#include <mrpt/utils/TEnumType.h>
#include <mrpt/gui/CDisplayWindow.h>

#include <mrpt/hwdrivers/link_pragmas.h>


namespace mrpt
{
        namespace hwdrivers
        {
                /** A class for grabing RGBD images from several OpenNI2 sensors. This is used to obtain larger fields of view using a radial configuration of the sensors.
                  * The same options (resolution, fps, etc.) are used for every sensor.
                  *
                  *  <h2>Configuration and usage:</h2> <hr>
                  * Data is returned as observations of type mrpt::obs::CObservationRGBD360.
                  *  See those classes for documentation on their fields.
                  *
                  * As with any other CGenericSensor class, the normal sequence of methods to be called is:
                  *   - CGenericSensor::loadConfig() - Or calls to the individual setXXX() to configure the sensor parameters.
                  *   - COpenNI2_RGBD360::initialize() - to start the communication with the sensor.
                  *   - call COpenNI2_RGBD360::getNextObservation() for getting the data.
                  *
                  * <h2>Calibration parameters</h2><hr>
                  *   The reference system for both depth and RGB images provided by each individual OpenNI2 sensors are referred to the
                  *   RGB Camera.
                  *   The extrinsic parameters of each RGBD sensor are provided from a configuration file. This calibration was obtained
                  *   using the method reported in [].
                  *
                  * <h2>Coordinates convention</h2><hr>
                  *   The origin of coordinates is the focal point of the RGB camera of the first indexed sensor, with the axes oriented
                  *   as in the diagram shown in mrpt::obs::CObservation3DRangeScan. Notice in that picture that the RGB camera is
                  *   assumed to have axes as usual in computer vision, which differ from those for the depth camera.
                  *
                  *   The X,Y,Z axes used to report the data from accelerometers coincide with those of the depth camera
                  *    (e.g. the camera standing on a table would have an ACC_Z=-9.8m/s2).
                  *
                  *   Notice however that, for consistency with stereo cameras, when loading the calibration parameters from
                  *    a configuration file, the left-to-right pose increment is expected as if both RGB & IR cameras had
                  *    their +Z axes pointing forward, +X to the right, +Y downwards (just like it's the standard in stereo cameras
                  *    and in computer vision literature). In other words: the pose stored in this class uses a different
                  *    axes convention for the depth camera than in a stereo camera, so when a pose L2R is loaded from a calibration file
                  *    it's actually converted like:
                  *
                  *      L2R(this class convention) = CPose3D(0,0,0,-90deg,0deg,-90deg) (+) L2R(in the config file)
                  *
                  *
                  * <h2>Some general comments</h2><hr>
                  *             - Depth is grabbed in 10bit depth, and a range N it's converted to meters as: range(m) = 0.1236 * tan(N/2842.5 + 1.1863)
                  *             - This sensor can be also used from within rawlog-grabber to grab datasets within a robot with more sensors.
                  *             - There is no built-in threading support, so if you use this class manually (not with-in rawlog-grabber),
                  *                     the ideal would be to create a thread and continuously request data from that thread (see mrpt::system::createThread ).
                  *             - The intensity channel default to the RGB images, but it can be changed with setVideoChannel() to read the IR camera images (useful for calibrating).
                  *             - There is a built-in support for an optional preview of the data on a window, so you don't need to even worry on creating a window to show them.
                  *             - This class relies on an embedded version of libfreenect (you do NOT need to install it in your system). Thanks guys for the great job!
                  *
                  * <h2>Converting to 3D point cloud </h2><hr>
                  *   You can convert the 3D observation into a 3D point cloud with this piece of code:
                  *
                  * \code
                  * mrpt::obs::CObservationRGBD360      obs3D;
                  * mrpt::maps::CColouredPointsMap       pntsMap;
                  * pntsMap.colorScheme.scheme = CColouredPointsMap::cmFromIntensityImage;
                  * pntsMap.loadFromRangeScan(obs3D);
                  * \endcode
                  *
                  *   Then the point cloud mrpt::maps::CColouredPointsMap can be converted into an OpenGL object for
                  *    rendering with mrpt::maps::CMetricMap::getAs3DObject() or alternatively with:
                  *
                  *  \code
                  *    mrpt::opengl::CPointCloudColouredPtr gl_points = mrpt::opengl::CPointCloudColoured::Create();
                  *    gl_points->loadFromPointsMap(&pntsMap);
                  *  \endcode
                  *
                  *
                  * <h2>Platform-specific comments</h2><hr>
                  *   For more details, refer to <a href="http://openkinect.org/wiki/Main_Page" >libfreenect</a> documentation:
                  *             - Linux: You'll need root privileges to access Kinect. Or, install <code> MRPT/scripts/51-kinect.rules </code> in <code>/etc/udev/rules.d/</code> to allow access to all users.
                  *             - Windows:
                  *                     - Since MRPT 0.9.4 you'll only need to install <a href="http://sourceforge.net/projects/libusb-win32/files/libusb-win32-releases/" >libusb-win32</a>: download and extract the latest libusb-win32-bin-x.x.x.x.zip
                  *                     - To install the drivers, read this: http://openkinect.org/wiki/Getting_Started#Windows
                  *             - MacOS: (write me!)
                  *
                  *
                  * <h2>Format of parameters for loading from a .ini file</h2><hr>
                  *
                  *  \code
                  *  PARAMETERS IN THE ".INI"-LIKE CONFIGURATION STRINGS:
                  * -------------------------------------------------------
                  *   [supplied_section_name]
                  *    sensorLabel     = RGBD360       // A text description
                  *    preview_window  = false        // Show a window with a preview of the grabbed data in real-time
                  *
                  *    device_number   = 0           // Device index to open (0:first Kinect, 1:second Kinect,...)
                  *
                  *    grab_image      = true        // Grab the RGB image channel? (Default=true)
                  *    grab_depth      = true        // Grab the depth channel? (Default=true)
                  *    grab_3D_points  = true        // Grab the 3D point cloud? (Default=true) If disabled, points can be generated later on.
                  *
                  *    video_channel   = VIDEO_CHANNEL_RGB // Optional. Can be: VIDEO_CHANNEL_RGB (default) or VIDEO_CHANNEL_IR
                  *
                  *    pose_x=0 // Camera position in the robot (meters)
                  *    pose_y=0
                  *    pose_z=0
                  *    pose_yaw=0       // Angles in degrees
                  *    pose_pitch=0
                  *    pose_roll=0
                  *
                  *
                  *    // Left/Depth camera
                  *    [supplied_section_name_LEFT]
                  *    rawlog-grabber-ignore = true // Instructs rawlog-grabber to ignore this section (it is not a separate device!)
                  *
                  *    resolution = [640 488]
                  *    cx         = 314.649173
                  *    cy         = 240.160459
                  *    fx         = 572.882768
                  *    fy         = 542.739980
                  *    dist       = [-4.747169e-03 -4.357976e-03 0.000000e+00 0.000000e+00 0.000000e+00]    // The order is: [K1 K2 T1 T2 K3]
                  *
                  *    // Right/RGB camera
                  *    [supplied_section_name_RIGHT]
                  *    rawlog-grabber-ignore = true // Instructs rawlog-grabber to ignore this section (it is not a separate device!)
                  *
                  *    resolution = [640 480]
                  *    cx         = 322.515987
                  *    cy         = 259.055966
                  *    fx         = 521.179233
                  *    fy         = 493.033034
                  *    dist       = [5.858325e-02 3.856792e-02 0.000000e+00 0.000000e+00 0.000000e+00]    // The order is: [K1 K2 T1 T2 K3]
                  *
                  *    // Relative pose of the right camera wrt to the left camera:
                  *    // This assumes that both camera frames are such that +Z points
                  *    // forwards, and +X and +Y to the right and downwards.
                  *    // For the actual coordinates employed in 3D observations, see figure in mrpt::obs::CObservation3DRangeScan
                  *    [supplied_section_name_LEFT2RIGHT_POSE]
                  *    rawlog-grabber-ignore = true // Instructs rawlog-grabber to ignore this section (it is not a separate device!)
                  *
                  *    pose_quaternion      = [0.025575 -0.000609 -0.001462 0.999987 0.002038 0.004335 -0.001693]
                  *
                  *  \endcode
                  *
                  *  More references to read:
                  *             - http://RGBD360
                  *             - http://http://www.openni.org/
                  * \ingroup mrpt_hwdrivers_grp
                  */
                class HWDRIVERS_IMPEXP  COpenNI2_RGBD360 : public mrpt::hwdrivers::CGenericSensor, public mrpt::hwdrivers::COpenNI2Generic
                {
                        DEFINE_GENERIC_SENSOR(COpenNI2_RGBD360)

                public:

                        COpenNI2_RGBD360();      //!< Default ctor
                        ~COpenNI2_RGBD360();     //!< Default ctor

                        /** Initializes the 3D camera - should be invoked after calling loadConfig() or setting the different parameters with the set*() methods.
                          *  \exception This method must throw an exception with a descriptive message if some critical error is found.
                          */
                        virtual void initialize();

                        /** To be called  at a high rate (>XX Hz), this method populates the internal buffer of received observations.
                          *  This method is mainly intended for usage within rawlog-grabber or similar programs.
                          *  For an alternative, see getNextObservation()
                          *  \exception This method must throw an exception with a descriptive message if some critical error is found.
                          * \sa getNextObservation
                          */
                        virtual void doProcess();

                        /** The main data retrieving function, to be called after calling loadConfig() and initialize().
                          *  \param out_obs The output retrieved observation (only if there_is_obs=true).
                          *  \param there_is_obs If set to false, there was no new observation.
                          *  \param hardware_error True on hardware/comms error.
                          *
                          * \sa doProcess
                          */
                        void getNextObservation(
                                mrpt::obs::CObservationRGBD360 &out_obs,
                                bool &there_is_obs,
                                bool &hardware_error );

                        /**  Set the path where to save off-rawlog image files (this class DOES take into account this path).
                          *  An  empty string (the default value at construction) means to save images embedded in the rawlog, instead of on separate files.
                          * \exception std::exception If the directory doesn't exists and cannot be created.
                          */
                        virtual void setPathForExternalImages( const std::string &directory );


                        /** @name Sensor parameters (alternative to \a loadConfig ) and manual control
                            @{ */

                        /** Get the maximum range (meters) that can be read in the observation field "rangeImage" */
                        inline double getMaxRange() const { return m_maxRange; }

                        /** Enable/disable the grabbing of the RGB channel */
                        inline void enableGrabRGB(bool enable=true) { m_grab_rgb=enable; }
                        inline bool isGrabRGBEnabled() const { return m_grab_rgb; }

                        /** Enable/disable the grabbing of the depth channel */
                        inline void enableGrabDepth(bool enable=true) { m_grab_depth=enable; }
                        inline bool isGrabDepthEnabled() const { return m_grab_depth; }

                        /** Enable/disable the grabbing of the 3D point clouds */
                        inline void enableGrab3DPoints(bool enable=true) { m_grab_3D_points=enable; }
                        inline bool isGrab3DPointsEnabled() const { return m_grab_3D_points; }

                        /** @} */

                protected:

                        virtual void  loadConfig_sensorSpecific(
                                const mrpt::utils::CConfigFileBase &configSource,
                                const std::string                       &section );

                        mrpt::poses::CPose3D    m_sensorPoseOnRobot;

                        static const int NUM_SENSORS = 2;

                        bool            m_preview_window; //!< Show preview window while grabbing
                        size_t          m_preview_window_decimation; //!< If preview is enabled, only show 1 out of N images.
                        size_t      m_preview_decim_counter_range, m_preview_decim_counter_rgb;
                        mrpt::gui::CDisplayWindowPtr  m_win_range[NUM_SENSORS], m_win_int[NUM_SENSORS];

                        double  m_maxRange; //!< Sensor max range (meters)

                        bool  m_grab_rgb, m_grab_depth, m_grab_3D_points ; //!< Default: all true

                };      // End of class
        } // End of NS

} // End of NS


#endif