private static async Task <FaceRecognitionResult> InvokeRecognizeAsync(MediaVisionSource source,
FaceRecognitionModel recognitionModel, Rectangle?area,
FaceRecognitionConfiguration config)
{
if (source == null)
{
throw new ArgumentNullException(nameof(source));
}
if (recognitionModel == null)
{
throw new ArgumentNullException(nameof(recognitionModel));
}
TaskCompletionSource <FaceRecognitionResult> tcs = new TaskCompletionSource <FaceRecognitionResult>();
using (var cb = ObjectKeeper.Get(GetRecognizedCallback(tcs)))
{
InvokeRecognize(source.Handle, recognitionModel.Handle, EngineConfiguration.GetHandle(config),
cb.Target, area).Validate("Failed to perform face recognition.");
return(await tcs.Task);
}
}
/// <summary>
/// Learns the face recognition model with <see cref="FaceRecognitionConfiguration"/>.
/// </summary>
/// <remarks>
/// Before you start the learning process, face recognition models have to be filled with the training data - face image examples.
/// These examples have to be provided by <see cref="Add(MediaVisionSource, int)"/> or <see cref="Add(MediaVisionSource, int, Rectangle)"/>.
/// Recognition accuracy is usually increased when the different examples of the identical faces are added more and more.
/// But it depends on the used learning algorithm.
/// </remarks>
/// <param name="config">The configuration used for learning of the recognition models. This value can be null.</param>
/// <exception cref="ObjectDisposedException">
/// The <see cref="FaceRecognitionModel"/> has already been disposed of.<br/>
/// -or-<br/>
/// <paramref name="config"/> has already been disposed of.
/// </exception>
/// <exception cref="InvalidOperationException">No examples added.</exception>
/// <seealso cref="Add(MediaVisionSource, int)"/>
/// <seealso cref="Add(MediaVisionSource, int, Rectangle)"/>
/// <since_tizen> 4 </since_tizen>
public void Learn(FaceRecognitionConfiguration config)
{
InteropModel.Learn(EngineConfiguration.GetHandle(config), Handle).
Validate("Failed to learn");
}
/// <summary>
/// Performs face recognition on the source with <see cref="FaceRecognitionModel"/> and <see cref="FaceRecognitionConfiguration"/>.
/// </summary>
/// <param name="source">The <see cref="MediaVisionSource"/> of the media to recognize faces for.</param>
/// <param name="recognitionModel">The <see cref="FaceRecognitionModel"/> to be used for recognition.</param>
/// <param name="config">The configuration used for recognition. This value can be null.</param>
/// <returns>A task that represents the asynchronous recognition operation.</returns>
/// <exception cref="ArgumentNullException">
/// <paramref name="source"/> is null.<br/>
/// -or-<br/>
/// <paramref name="recognitionModel"/> is null.
/// </exception>
/// <exception cref="NotSupportedException">The feature is not supported.</exception>
/// <exception cref="ObjectDisposedException">
/// <paramref name="source"/> has already been disposed of.<br/>
/// -or-<br/>
/// <paramref name="config"/> has already been disposed of.
/// </exception>
/// <exception cref="InvalidOperationException"><paramref name="recognitionModel"/> is untrained model.</exception>
/// <feature>http://tizen.org/feature/vision.face_recognition</feature>
/// <since_tizen> 4 </since_tizen>
public static async Task <FaceRecognitionResult> RecognizeAsync(MediaVisionSource source,
FaceRecognitionModel recognitionModel, FaceRecognitionConfiguration config)
{
return(await InvokeRecognizeAsync(source, recognitionModel, null, config));
}
/// <summary>
/// Determines facial expression on media source.
/// </summary>
/// <param name="source">The source of the media to recognize facial expression for.</param>
/// <param name="bound">The location bounding the face at the source.</param>
/// <param name="config">The configuration used for expression recognition. This value can be null.</param>
/// <returns>A task that represents the asynchronous recognition operation.</returns>
/// <exception cref="ArgumentNullException"><paramref name="source"/> is null.</exception>
/// <exception cref="ObjectDisposedException">
/// <paramref name="source"/> has already been disposed of.<br/>
/// -or-<br/>
/// <paramref name="config"/> has already been disposed of.
/// </exception>
/// <exception cref="NotSupportedException">The feature is not supported.</exception>
/// <feature>http://tizen.org/feature/vision.face_recognition</feature>
/// <since_tizen> 4 </since_tizen>
public static async Task <FacialExpression> RecognizeFacialExpressionAsync(MediaVisionSource source,
Rectangle bound, FaceRecognitionConfiguration config)
{
if (source == null)
{
throw new ArgumentNullException(nameof(source));
}
TaskCompletionSource <FacialExpression> tcsResult = new TaskCompletionSource <FacialExpression>();
InteropFace.MvFaceFacialExpressionRecognizedCallback cb = (IntPtr sourceHandle, IntPtr engineCfgHandle,
global::Interop.MediaVision.Rectangle faceLocation, FacialExpression facialExpression, IntPtr _) =>
{
Log.Info(MediaVisionLog.Tag, $"Facial expression recognized, expression : {facialExpression}");
if (!tcsResult.TrySetResult(facialExpression))
{
Log.Error(MediaVisionLog.Tag, "Failed to set facial result");
}
};
using (var cbKeeper = ObjectKeeper.Get(cb))
{
InteropFace.RecognizeFacialExpression(source.Handle, EngineConfiguration.GetHandle(config),
bound.ToMarshalable(), cb).
Validate("Failed to perform facial expression recognition.");
return(await tcsResult.Task);
}
}