/// <summary>
/// Finds the detected face within the list of faces supplied, that is closest to the object identity's position.
/// </summary>
/// <param name="faces">A list of detected faces by the Windows FaceAnalysis namespace.</param>
/// <returns>The face object that is the closest to the object identity's position.</returns>
public DetectedFace FindNearestFace(IList <DetectedFace> faces)
{
if (faces.Count == 0)
{
return(null);
}
DetectedFace nearestFace = null;
var nearestFaceDistance = double.MaxValue;
foreach (var face in faces)
{
var faceCenter = IdentityInterpolation.GetCenterPoint(face.FaceBox);
var distance = IdentityInterpolation.GetRelativeDistance(centerPoint, faceCenter);
if (distance < nearestFaceDistance)
{
nearestFace = face;
nearestFaceDistance = distance;
}
}
return(nearestFace);
}
/// <summary>
/// Updates the position of the face (probably in a new frame).
/// Updates both the bounding box as well as the center point of the (new) bounding box.
/// </summary>
/// <param name="faceBox">The bounding box indicating the position and size of the face.</param>
public void UpdatePosition(BitmapBounds faceBox)
{
boundingBox = faceBox;
surfaceArea = (int)faceBox.Width * (int)faceBox.Height;
centerPoint = IdentityInterpolation.GetCenterPoint(faceBox);
}
