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{% include “_versions.html” %}

Motion Tracking

In Android {{ androidPVersionNumber }}, camera devices can advertise motion tracking capability{: .external}. Cameras that support this feature do not produce motion tracking data itself, but instead are used by ARCore or an image-stabilization algorithm along with other sensors for scene analysis. To support this feature, devices must support CONTROL_CAPTURE_INTENT_MOTION_TRACKING{: .external}. If this intent is part of the capture request, the camera must limit the exposure time to a maximum of 20 milliseconds to reduce motion blur.

Examples and source

A reference motion tracking implementation on the HAL side is available as part of the Camera HAL{: .external}.

Implementation

To enable motion tracking on a camera device, make sure:

• The ANDROID_REQUEST_AVAILABLE_CAPABILITIES_MOTION_TRACKING{: .external} capability is enabled.

• The ANDROID_CONTROL_CAPTURE_INTENT_MOTION_TRACKING{: .external} intent is supported and when included in a capture request limits the camera exposure time to a maximum of 20 milliseconds.

• Lens calibration data from the following list is accurately reported in the static information and dynamic metadata fields:

  • ANDROID_LENS_POSE_ROTATION{: .external}
  • ANDROID_LENS_POSE_TRANSLATION{: .external}
  • ANDROID_LENS_INTRINSIC_CALIBRATION{: .external}
  • ANDROID_LENS_RADIAL_DISTORTION{: .external}
  • ANDROID_LENS_POSE_REFERENCE{: .external}

Validation

Camera devices supporting the motion tracking feature must pass the camera CTS tests.