View source for Sample Videos and Projects (four GoPro)

Here you can find sample videos and animations captured with the aid of four [https://shop.gopro.com/cameras GoPro] action cameras:
* '''cam1''' and '''cam2''' — GoPro HERO4 Silver
* '''cam3''' and '''cam4''' — GoPro HERO4 Session

<center>[[File:GoPro-HERO4.jpg|x100px]]&nbsp;[[File:GoPro-HERO4.jpg|x100px]]&nbsp;&nbsp;&nbsp;[[File:GoPro-HERO4-Session.jpg|x100px]]&nbsp;&nbsp;&nbsp;&nbsp;[[File:GoPro-HERO4-Session.jpg|x100px]]</center>

The following settings were used for recording:
* Resolution: '''720p''' (1280x720)
* FOV: '''Wide'''
* FPS: '''60'''

{{Tip|Short description of overall process of recording and processing can be found in [[Quick Start Guide for Multiple Action Cameras Configuration]].}}

=== Camera Optics Calibration Video ===

[[File:sample-four-gopro-cam1-calibration.jpg|400px|thumb]]

Each individual action camera must be calibrated before usage in motion capture session. Below you can find calibration videos (<tt>.MP4</tt> files) and results of calibration (<tt>.iPiCam</tt> files) for each camera:

{|class="wikitable" border="1"
!Camera
!Calibration Video (.MP4)
!Camera Parameters (.iPiCam)
!Recommended Frames for Calibration
!Recommended Scale for Undistorting
|-
|cam1
|<tt>↓ [http://files.ipisoft.com/samples4/four-gopro/internal-calib/cam1-720p-wide.MP4 cam1-720p-wide.MP4] (13 MByte)</tt>
|<tt>↓ [http://files.ipisoft.com/samples4/four-gopro/internal-calib/cam1-720p-wide.iPiCam cam1-720p-wide.iPiCam] (407 Byte)</tt>
| 50, 880, 1360, 1780, 2110
| 0.80 
|-
|cam2
|<tt>↓ [http://files.ipisoft.com/samples4/four-gopro/internal-calib/cam2-720p-wide.MP4 cam2-720p-wide.MP4] (11 MByte)</tt>
|<tt>↓ [http://files.ipisoft.com/samples4/four-gopro/internal-calib/cam2-720p-wide.iPiCam cam2-720p-wide.iPiCam] (410 Byte)</tt>
| 1, 380, 840, 1220, 2016
| 0.80 
|-
|cam3
|<tt>↓ [http://files.ipisoft.com/samples4/four-gopro/internal-calib/cam3-720p-wide.MP4 cam3-720p-wide.MP4] (41 MByte)</tt>
|<tt>↓ [http://files.ipisoft.com/samples4/four-gopro/internal-calib/cam3-720p-wide.iPiCam cam3-720p-wide.iPiCam] (412 Byte)</tt>
| 1, 340, 1260, 2420, 2910, 3680, 4490, 5120
| 0.80 
|-
|cam4
|<tt>↓ [http://files.ipisoft.com/samples4/four-gopro/internal-calib/cam4-720p-wide.MP4 cam4-720p-wide.MP4] (32 MByte)</tt>
|<tt>↓ [http://files.ipisoft.com/samples4/four-gopro/internal-calib/cam4-720p-wide.iPiCam cam4-720p-wide.iPiCam] (409 Byte)</tt>
| 1, 410, 1100, 1950, 2660, 3320, 3510, 4130
| 0.80 
|}

How to use:
* Download and install [[iPi Recorder]].
* Download .MP4 video files from the above table.
* Run [[iPi Recorder]], click '''Calibrate Camera Optics''' in toolbar.
* For each camera (.MP4 video file):
** Switch to '''CALIBRATION''' tab.
** Click '''Open Video''' button in toolbar, choose appropriate video file.
** Select a few frames for calibration using timeline and '''Toggle Current Frame''' button. You can use recommended frames from the above table or choose frames you like.
** Click '''Run Calibration''' button.
** Now you see results of calibration. You can adjust scale.
** Save results to <tt>.iPiCam</tt> file.

For more information see [[How to Calibrate Camera Optics]].

=== Scene Calibration Sequence ===

[[File:sample-four-gopro-scene-calibration.jpg|600px|thumb]]

While [[How to Calibrate Camera Optics|camera optics calibration]] is used to determine intrinsic parameters of each camera and can be done once, [[User Guide for Multiple PS Eye Cameras Configuration#Calibration|scene calibration]] is a process of computing accurate mutual camera positions and orientations in space and should be done for each new cameras setup/configuration. A small glowing object called ''marker'' is used for scene calibration.

Below you can find individual <tt>.MP4</tt> video files from each camera with calibration sequence:

{|class="wikitable" border="1"
!Camera
!Video with Marker (.MP4)
!Recommended Sync Frame
|-
|cam1
|<tt>↓ [http://files.ipisoft.com/samples4/four-gopro/scene-calib/calib-cam1.mp4 calib-cam1.mp4] (5 MByte)</tt>
| 685 
|-
|cam2
|<tt>↓ [http://files.ipisoft.com/samples4/four-gopro/scene-calib/calib-cam2.mp4 calib-cam2.mp4] (14 MByte)</tt>
| 3743
|-
|cam3
|<tt>↓ [http://files.ipisoft.com/samples4/four-gopro/scene-calib/calib-cam3.mp4 calib-cam3.mp4] (25 MByte)</tt>
| 2514
|-
|cam4
|<tt>↓ [http://files.ipisoft.com/samples4/four-gopro/scene-calib/calib-cam4.mp4 calib-cam4.mp4] (30 MByte)</tt>
| 1739 
|}

How to build synchronized multi-camera video:
* Download <tt>.MP4</tt> video files from the above table.
* Run [[iPi Recorder]], click '''Build Combined Video''' in toolbar.
* For each video (i.e. camera) in order from <tt>cam1</tt> to <tt>cam4</tt> do the following steps:
** Click '''Add Video''' in toolbar, choose appropriate video file.
** Click on '''PROPERTIES''' button in the top area of image from camera.
** Click '''Load''' button in section '''camera parameters''' in the left panel, choose appropriate <tt>.iPiCam</tt> file from the previous section (for example, <tt>cam'''3'''-720p-wide.iPiCam</tt> for <tt>calib-cam'''3'''.mp4</tt> video).
** Click '''Edit''' button in section '''sync frame''' in the left panel, choose the first frame where marker becomes visible (see '''Recommended Sync Frame''' column), click '''Set to Current Frame''' button in toolbar, switch back to '''BUILD''' tab.
* Now video is combined and synchronized but we have to evaluate background (clear scene without marker and moving objects):
** Choose region on timeline where marker is not visible (for example: from <tt>95</tt> to <tt>665</tt> frames).
** Click '''Evaluate Background''' button in toolbar.
* You're ready to save result to <tt>.iPiVideo</tt> file:
** Choose region to be saved: you can save the whole video or only part where marker is visible (for example: from <tt>690</tt> to <tt>6960</tt> frames).
** Click '''Save Combined Video''' button in toolbar.

Below you can find <tt>[[.iPiVideo File Extension|.iPiVideo]]</tt> file created using this procedure:

{{SampleCalibDownloads4|folder=four-gopro|name=four-gopro-calibration|videoSize=525 MByte|calibSize=280 KByte}}

How to use these files:
* Download and install [[iPi Mocap Studio]].
* Download both above files and put them all in one and the same folder on your hard drive.
* Run [[iPi Mocap Studio]], click '''Open''' button or press <tt>Ctrl+O</tt> and select <tt>four-gopro-calibration.iPiCalib</tt> file downloaded on the previous step.
* Now you can "play" with resulting calibration data in [[iPi Mocap Studio]].
* If you want to try to process source video file by yourself then:
** click '''New''' button or press <tt>Ctrl+N</tt>;
** select <tt>four-gopro-calibration.iPiVideo</tt> file downloaded before;
** choose '''Calibration project''' type;
** switch to '''Calibration''' tab and push '''Calibrate''' button;
** to adjust scene scale use the following parameters:
*** the height of first camera over ground plane is about '''1.12 m'''

=== Action Sequence ===

As soon as scene parameters found (that is, scene calibration performed) you can record and process video with motions (action video).

Below you can find individual <tt>.MP4</tt> video files from each camera with calibration sequence:

{|class="wikitable" border="1"
!Camera
!Video with Marker (.MP4)
!Recommended Sync Frame
|-
|cam1
|<tt>↓ [http://files.ipisoft.com/samples4/four-gopro/action/action-cam1.mp4 action-cam1.mp4] (9 MByte)</tt>
| 3940 
|-
|cam2
|<tt>↓ [http://files.ipisoft.com/samples4/four-gopro/action/action-cam2.mp4 action-cam2.mp4] (40 MByte)</tt>
| 3534
|-
|cam3
|<tt>↓ [http://files.ipisoft.com/samples4/four-gopro/action/action-cam3.mp4 action-cam3.mp4] (25 MByte)</tt>
| 3573
|-
|cam4
|<tt>↓ [http://files.ipisoft.com/samples4/four-gopro/action/action-cam4.mp4 action-cam4.mp4] (20 MByte)</tt>
| 3570 
|}

How to build synchronized multi-camera video:
* Download <tt>.MP4</tt> video files from the above table.
* Run [[iPi Recorder]], click '''Build Combined Video''' in toolbar.
* For each video (i.e. camera) in order from <tt>cam1</tt> to <tt>cam4</tt> do the following steps:
** Click '''Add Video''' in toolbar, choose appropriate video file.
** Click on '''PROPERTIES''' button in the top area of image from camera.
** Click '''Load''' button in section '''camera parameters''' in the left panel, choose appropriate <tt>.iPiCam</tt> file from the previous section (for example, <tt>cam'''3'''-720p-wide.iPiCam</tt> for <tt>action-cam'''3'''.mp4</tt> video).
** Click '''Edit''' button in section '''sync frame''' in the left panel, choose frame where illumination from camera flash is visible (see '''Recommended Sync Frame''' column in the above table), click '''Set to Current Frame''' button in toolbar, switch back to '''BUILD''' tab.
* Now video is combined and synchronized but we have to evaluate background (clear scene without marker and moving objects):
** Choose region on timeline where scene is almost clear (for example: from <tt>3681</tt> to <tt>3733</tt> frames).
** Click '''Evaluate Background''' button in toolbar.
* You're ready to save result to <tt>.iPiVideo</tt> file:
** Choose region to be saved: you can save the whole video or only part with required motions (for example: from <tt>75</tt> to <tt>3435</tt> frames).
** Click '''Save Combined Video''' button in toolbar.

Below you can find <tt>[[.iPiVideo File Extension|.iPiVideo]]</tt> file created using this procedure:

{{SampleDownloads4|folder=four-gopro|name=four-gopro-action|videoSize=680 MByte|projectSize=3 MByte}}

How to use these files:
* Download both files and put them into one folder on your hard drive.
* Run [[iPi Mocap Studio]], click '''Open''' button or press <tt>Ctrl+O</tt> and select <tt>four-gopro-action.iPiMotion</tt> file downloaded on the previous step.
* Now you can "play" with resulting animation in [[iPi Mocap Studio]], import your target character and export resulting animation based on the [[Animation Export|following instructions]].
* If you want to try to process source video file by yourself then:
** click '''New''' button or press <tt>Ctrl+N</tt>;
** select <tt>four-gopro-action.iPiVideo</tt> file downloaded before;
** choose '''Action project''' type;
** choose the following file as scene parameters: <tt>four-gopro-calibration.iPiCalib</tt> (see previous section)
** set the following parameters of actor:
*** '''Gender''' = '''Male'''
*** '''Height''' = '''1.76 m'''
*** '''Clothing model''' = '''T-Shirt over Long-sleeve Shirt'''
** then you can process the video:
*** adjust light position and parameters (It is very important for good tracking quality!)
*** go to the frame with T-pose
*** manually align model with image in each camera
*** adjust actor appearance (manually and/or automatically)
*** run tracking by clicking '''Track Forward''' button
*** [[Manual Clean-up|manually fix]] tracking errors if any
*** apply '''Refine Forward/Backward''' and '''Jitter Remover''' to [[Automatic Refinement and Filtering|improve animation]]

=== Exported Animation ===

{{SampleExport4|folder=four-gopro/export}}

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