/// <summary>
/// Equals method
/// </summary>
/// <returns>Returns true if not equivalent, otherwise false</returns>
public bool Equals(FaceTrackInfo other)
{
if (this.TrackValid != other.TrackValid || this.FaceRect != other.FaceRect ||
this.Rotation != other.Rotation || this.Translation != other.Translation)
{
return(false);
}
return(true);
}
/// <summary>
/// Retrieve the transform matrix based on the input FaceTrackInfo
/// Note: We find the one that has minimum rotation gap compared with input,
/// and meanwhile lower than translation, rotation tolerance
/// </summary>
/// <param name="faceInfo">The input face tracking information used for searching.</param>
/// <param name="resultMatrix">Output result transform matrix.</param>
/// <returns>Whether successfully get the transform matrix</returns>
public bool RetrieveTransformMatrix(FaceTrackInfo faceInfo, out Matrix4 resultMatrix)
{
bool retrieveSucceeded = false;
resultMatrix = Matrix4.Identity;
// Track the face tracking information is valid
if (faceInfo.TrackValid)
{
List <int> candidateIndexes = new List <int>();
// Get the candidates
for (int i = 0; i < SavedFrameCount; i++)
{
if (null != locationFrames[i])
{
double translationGap = GetDistance(faceInfo.Translation, locationFrames[i].FaceInfo.Translation);
// A valid candidate
if (translationGap < TranslationTolerance)
{
candidateIndexes.Add(i);
}
}
}
// Retrieve the best candidate and also lower than the tolerance
double minimumRotationGap = double.MaxValue;
int retrieveIndex = 0;
foreach (var candidateIndex in candidateIndexes)
{
double rotationGap = GetAbsoluteGap(faceInfo.Rotation, locationFrames[candidateIndex].FaceInfo.Rotation);
if (rotationGap < minimumRotationGap)
{
minimumRotationGap = rotationGap;
retrieveIndex = candidateIndex;
}
}
if (minimumRotationGap < RotationTolerance)
{
retrieveSucceeded = true;
resultMatrix = locationFrames[retrieveIndex].WorldToCameraTransform;
}
}
return(retrieveSucceeded);
}
/// <summary>
/// Update the relocation database
/// </summary>
/// <param name="faceInfo">The input face tracking information.</param>
/// <param name="worldToCameraTransform">The corresponding transform matrix.</param>
public void UpdateRelocation(FaceTrackInfo faceInfo, Matrix4 worldToCameraTransform)
{
processedFrames++;
if (!faceInfo.TrackValid)
{
return;
}
// We save a frame in every SavingFrameInterval frames
if (processedFrames >= SavingFrameInterval)
{
// Update the frame index
savedFrameIndex = ++savedFrameIndex % SavedFrameCount;
// Write input data to database
locationFrames[savedFrameIndex] = new LocationFrame {
FaceInfo = faceInfo, WorldToCameraTransform = worldToCameraTransform
};
processedFrames = 0;
}
}
