Marker Tracker

Related documentations
Marker
Tracker Coordinate System

By recognizing and tracking the provided markers, you can augment images, 3D objects or videos especially when there are plenty of targets. 8,192 markers will be provided which were developed by MAXST itself.

Start / Stop Tracker

After setting the markers, refer to the following code to start / stop the tracker.

MarkerTrackerActivity.java
@Override
protected void onResume() {
    ...
    TrackerManager.getInstance().startTracker(TrackerManager.TRACKER_TYPE_MARKER);
    ...
}

@Override
protected void onPause() {
    ...
    TrackerManager.getInstance().stopTracker();
    ...
}

Use Tracking Information

Refer to the following code to use the tracking information. You can choose the marker and augment the content by creating the conditional statement with trackable.getID ().


MarkerTrackerRenderer.java
@Override
public void onDrawFrame(GL10 unused) {
    ...
    TrackingState state = TrackerManager.getInstance().updateTrackingState();
    TrackingResult trackingResult = state.getTrackingResult();
    ...
    for (int i = 0; i < trackingResult.getCount(); i++) {
        Trackable trackable = trackingResult.getTrackable(i);
        texturedCube.setProjectionMatrix(projectionMatrix);
        texturedCube.setTransform(trackable.getPoseMatrix());
        texturedCube.setTranslate(0, 0, -0.05f);
        texturedCube.setScale(1.0f, 1.0f, 0.1f);
        texturedCube.draw();
    }
}

Set Target Marker

Once you enter the target marker size (m) and call the addTrackerData, you can track the marker in real scale. Refer to the following code to set a target marker.


MarkerTrackerActivity.java
@Override
protected void onCreate(Bundle savedInstanceState) {
    TrackerManager.getInstance().addTrackerData("All : 1.3, id0 : 0.5, id1 : 0.5, id3 : 0.4, id10 : 1.5", true);
    TrackerManager.getInstance().loadTrackerData();
}

Change Tracking Mode

4 Tracking Modes of Marker Tracker:

NORMAL_TRACKING, ENHANCED_TRACKING, JITTER_REDUCTION_ACTIVATION, JITTER_REDUCTION_DEACTIVATION

  • NORMAL_TRACKING: Default Setting. Traceable multiple target image.
TrackerManager.getInstance().setTrackingOption(TrackerManager.TrackingOption.NORMAL_TRACKING);
  • ENHANCED_TRACKING: This feature tracks the marker intensively that recognizes the first.
TrackerManager.getInstance().setTrackingOption(TrackerManager.TrackingOption.ENHANCED_TRACKING);
  • JITTER_REDUCTION_ACTIVATION: Jitter reduction.
TrackerManager.getInstance().setTrackingOption(TrackerManager.TrackingOption.JITTER_REDUCTION_ACTIVATION);
  • JITTER_REDUCTION_DEACTIVATION: Disable the jitter reduction option.
TrackerManager.getInstance().setTrackingOption(TrackerManager.TrackingOption.JITTER_REDUCTION_DEACTIVATION);