Liveness
===============

.. automethod:: tfsdk.SDK.detect_blink

.. autoclass:: tfsdk.BlinkState
    :members:

To reduce False Positives, blink detection must be run with several constraints:

- Ensure the face is frontal facing
- The face should be 1 - 3 ft from the camera
- Recommended 640 x 480 resolution or better
- Ensure there is good lighting illuminating the eyes

.. image:: ../../shared/images/blink_detection_distance.png
   :width: 400pt

.. image:: ../../shared/images/blink_detection_lighting.png
   :width: 400pt