Depth sensors provide body tracking data based on embedded tracking algorithms. The accuracy of such tracking is rather low and far below requirements of professional-level motion capture solutions. Tracking provided by iPi Mocap Studio
is based on iPi Soft's algorithms and do not use tracking data from sensors. However, sensor's tracking can be effectively used to improve workflow.
We record and use tracking data from Kinect 2 sensors. The data are used for:
- Detecting number of actors
- Detecting actor heights
- Detecting T-Poses and creation of takes
- Setting initial pose for detected T-poses
- Setting inital pose for first frame of Region-of-Interest
- Warning on presense of people in sensor view during background recording
Recording Sensor Tracking Data
iPi Recorder records tracking data provided by depth sensor for further use in iPi Mocap Studio.
As soon as embedded tracking algorithms work well only when actor faces the sensor and each sensor works indepndently from others, for T-Pose and takes creation we only use data from first sensor.
To make the most of sensors' tracking data, please follow this recommendations during recording:
- Strike T-Pose before each take
- You have to stay in T-Pose at least for one second
- Face first sensor in T-Pose
- If you have several actors, each of them should face first sensor
In case when capture area does not allow to face the sensor, you can stay at an angle to sensor. Make sure that arms and legs are not occluded from sensor.
If you stand back to sensor, embedded tracking will detect gaze direction opposite to actual, so automatically detected inital pose will be incorrect and you'll have to manually fix this in iPi Mocap Studio
Using Sensor Tracking Data
Detecting Number of Actors and Actor Heights
When creating a new project from recorded .iPiVideo file, you need to specify number of actors and their heghts. These numbers are detected based on tracking data. You just need to check them during project creation, as embedded tracking algorithms are not very accurate. Correct the numbers if necessary.
If you only have single depth sensor, you'll not have number of actors selection step, as multiple actors tracking is not supported for single depth sensor.