fdBoundingPoly property
The fdBoundingPoly bounding polygon is tighter than the boundingPoly, and encloses only the skin part of the face. Typically, it is used to eliminate the face from any image analysis that detects the "amount of skin" visible in an image. It is not based on the landmarker results, only on the initial face detection, hence the 'fd' (face detection) prefix.
Implementation
final BoundingPoly fdBoundingPoly;