• viotrack_s2_at_nab_2015

    VioTrack S1


    • reliable 3D camera tracking for fixed camera positions
       
    • uses feature points in camera video picture only
       
    • absolute camera pose and highest reliability trough unique markers
  • viotrack_s2_at_nab_2015

    VioTrack S2


    • reliable 3D camera tracking for real-time pose estimation of moving cameras
       
    • uses feature points in camera video picture AND lens data
       
    • absolute camera pose and highest reliability trough unique markers
  • viotrack_s2_at_nab_2015

    VioTrack S3


    • reliable camera tracking for real-time 3D pose estimation of moving cameras with unlimited zoom range
       
    • uses feature points in dedicated sensor camera AND  broadcast camera image AND  lens data
       
    • absolute camera pose and highest reliability trough unique markers

Technology

Real-time algorithm uses video feature points within the video image

Instead of measuring the single axis of the support system, calibrating and calculating the final position of the camera, VioTrack determines the position of the virtual objects directly.
Optical absolute markers are placed within the studio and are building the basis for all calculations. Each marker can be identified by VioTrack through it's unique pattern.

The markers are painted with a slightly different green or blue tone than the standard background, therefore they can easily be keyed by the Chroma Keyer and do not appear in the final image. Alternatively you can fix retroreflective markers at the studio ceiling or wall. Together with dedicated infrared lighting and sensor camera you can work independent of the studio lighting or green/blue box. So even Augmented Reality applications are possible.

 

S1 Determines the exact pose for Virtual Graphics within the video image
Within the video picture of the broadcast camera, VioTrack determines the correct position of these image feature points in 3D and sticks the virtual objects at the place of those markers or there surrounding.

S2 Determines the exact camera  pose even for moving cameras
Within the video picture of the broadcast camera, VioTrack determines the correct position of these image feature points in 3D and sticks the virtual objects at the place of those markers or there surrounding. Because it uses the data form zoom and focus of the TV lens, it can precisely determine the 3D position and orientation of the camera while moving, even if the marker plane is just a flat 2D screen.

S3 Determines the exact camera  pose about full zoom range
Besides the camera video picture, VioTrack S3 employes a dedicated sensor camera to observe the scenery. This sensor camera is rigidly attached to the TV camera and follows every movement. Even if the TV camera lens fully zooms in and the video features could not be recognized any longer in the TV camera picture, the sensor camera still observes the relevant features. Therefore all camera and lens axis can freely be moved.

Instead of chroma key markers at the green/blue screen you can fix retroreflective markers at the studio ceiling or wall. Together with dedicated infrared lighting and the sensor camera pointing upwards to the markers you can work independent of the studio lighting or a green/blue box. So even Augmented Reality applications are possible.

 

Real-time algorithm uses the camera video picture for perfect matching results
The camera video signal is building the basis for all calculations. This causes a perfect matching between real objects and virtual graphics. Depending on the VioTrack version, the actual lens parameters are processed in addition (VioTrack S2 and S3) and even a sensor camera is applied (VioTrack S3).

unique markers for absolute positioning
The employed markers guarantee a reliable and absolute result for the positioning of the graphics. Each marker contains a unique pattern.  After the self-calibration, the 3D position of each marker is well known by the software.

Therefore whenever you start the tracking, it will immediately find the absolute position of the camera and therefore the Virtual Graphics. There is no need for further adjustments.

various markers for various jobs
The size of the markers, their pattern, their number of dots, their color, everything can be changed to adapt them to the specific job. While just a few smaller markers are needed for a simple screen, many markers are used for a 1.000 sqrm green box with four walls.

Automated self-calibration of markers
First you draw, paint or stick the markers in any order (!) and any position to the wall, floor or ceiling. Then a camera is used to just take some snapshots of these markers from various angles. That’s it!

The calibration software automatically calculates the 3D position of each marker and stores this data for the usage with the real-time camera tracking.