/
FaceRecognitionModel.cs
executable file
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/
FaceRecognitionModel.cs
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/*
* Copyright (c) 2016 Samsung Electronics Co., Ltd All Rights Reserved
*
* Licensed under the Apache License, Version 2.0 (the License);
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an AS IS BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
using System;
using System.IO;
using System.Runtime.InteropServices;
using InteropModel = Interop.MediaVision.FaceRecognitionModel;
namespace Tizen.Multimedia.Vision
{
/// <summary>
/// Represents the face recognition model interface.
/// </summary>
/// <feature>http://tizen.org/feature/vision.face_recognition</feature>
/// <since_tizen> 4 </since_tizen>
public class FaceRecognitionModel : IDisposable
{
private IntPtr _handle = IntPtr.Zero;
private bool _disposed = false;
/// <summary>
/// Initializes a new instance of the <see cref="FaceRecognitionModel"/> class.
/// </summary>
/// <exception cref="NotSupportedException">The feature is not supported.</exception>
/// <since_tizen> 4 </since_tizen>
public FaceRecognitionModel()
{
InteropModel.Create(out _handle).Validate("Failed to create FaceRecognitionModel");
}
/// <summary>
/// Initializes a new instance of the <see cref="FaceRecognitionModel"/> class with the specified path.
/// </summary>
/// <remarks>
/// Models saved by <see cref="Save(string)"/> can be loaded.
/// </remarks>
/// <param name="modelPath">Path to the model to load.</param>
/// <exception cref="ArgumentNullException"><paramref name="modelPath"/> is null.</exception>
/// <exception cref="FileNotFoundException"><paramref name="modelPath"/> is invalid.</exception>
/// <exception cref="NotSupportedException">
/// The feature is not supported.<br/>
/// -or-<br/>
/// <paramref name="modelPath"/> is not supported format.
/// </exception>
/// <exception cref="UnauthorizedAccessException">No permission to access the specified file.</exception>
/// <seealso cref="Save(string)"/>
/// <since_tizen> 4 </since_tizen>
public FaceRecognitionModel(string modelPath)
{
if (modelPath == null)
{
throw new ArgumentNullException(nameof(modelPath));
}
InteropModel.Load(modelPath, out _handle).
Validate("Failed to load FaceRecognitionModel from file");
}
/// <summary>
/// Finalizes an instance of the FaceRecognitionModel class.
/// </summary>
~FaceRecognitionModel()
{
Dispose(false);
}
/// <summary>
/// Gets labels that had been learned by the model.
/// </summary>
/// <exception cref="ObjectDisposedException">The <see cref="FaceRecognitionModel"/> has already been disposed of.</exception>
/// <since_tizen> 4</since_tizen>
public int[] Labels
{
get
{
IntPtr unmangedArray = IntPtr.Zero;
try
{
InteropModel.QueryLabels(Handle, out unmangedArray, out var numOfLabels).
Validate("Failed to retrieve face labels.");
int[] labels = new int[numOfLabels];
Marshal.Copy(unmangedArray, labels, 0, (int)numOfLabels);
return labels;
}
finally
{
if (unmangedArray != IntPtr.Zero)
{
LibcSupport.Free(unmangedArray);
}
}
}
}
/// <summary>
/// Saves the recognition model to the file.
/// </summary>
/// <param name="path">Path to the file to save the model.</param>
/// <exception cref="ArgumentNullException"><paramref name="path"/> is null.</exception>
/// <exception cref="UnauthorizedAccessException">No permission to write to the specified path.</exception>
/// <exception cref="ObjectDisposedException">The <see cref="FaceRecognitionModel"/> has already been disposed of.</exception>
/// <exception cref="DirectoryNotFoundException">The directory for <paramref name="path"/> does not exist.</exception>
/// <since_tizen> 4 </since_tizen>
public void Save(string path)
{
if (path == null)
{
throw new ArgumentNullException(nameof(path));
}
var ret = InteropModel.Save(path, Handle);
if (ret == MediaVisionError.InvalidPath)
{
throw new DirectoryNotFoundException($"The directory for the path({path}) does not exist.");
}
ret.Validate("Failed to save recognition model to file");
}
private MediaVisionError InvokeAdd(MediaVisionSource source, int label, Rectangle? area)
{
if (area != null)
{
var rect = area.Value.ToMarshalable();
return InteropModel.Add(source.Handle, Handle, ref rect, label);
}
return InteropModel.Add(source.Handle, Handle, IntPtr.Zero, label);
}
/// <summary>
/// Adds the face image example to be used for face recognition model learning.
/// </summary>
/// <param name="source">The <see cref="MediaVisionSource"/> that contains face image.</param>
/// <param name="label">The label that identifies face for which example is adding.
/// Specify the same labels for the face images of a single person when calling this method.
/// Has to be unique for each face.</param>
/// <exception cref="ArgumentNullException"><paramref name="source"/> is null.</exception>
/// <exception cref="ObjectDisposedException">
/// The <see cref="FaceRecognitionModel"/> has already been disposed of.<br/>
/// -or-<br/>
/// <paramref name="source"/> has already been dispose of.
/// </exception>
/// <seealso cref="Learn(FaceRecognitionConfiguration)"/>
/// <since_tizen> 4 </since_tizen>
public void Add(MediaVisionSource source, int label)
{
if (source == null)
{
throw new ArgumentNullException(nameof(source));
}
InvokeAdd(source, label, null).Validate("Failed to add face example image");
}
/// <summary>
/// Adds the face image example to be used for face recognition model learning.
/// </summary>
/// <param name="source">The <see cref="MediaVisionSource"/> that contains face image.</param>
/// <param name="label">The label that identifies face for which example is adding.
/// Specify the same labels for the face images of a single person when calling this method.
/// Has to be unique for each face.</param>
/// <param name="area">The rectangular region of the face image at the source image.</param>
/// <exception cref="ArgumentNullException"><paramref name="source"/> is null.</exception>
/// <exception cref="ObjectDisposedException">
/// The <see cref="FaceRecognitionModel"/> has already been disposed of.<br/>
/// -or-<br/>
/// <paramref name="source"/> has already been dispose of.
/// </exception>
/// <seealso cref="Learn(FaceRecognitionConfiguration)"/>
/// <since_tizen> 4 </since_tizen>
public void Add(MediaVisionSource source, int label, Rectangle area)
{
if (source == null)
{
throw new ArgumentNullException(nameof(source));
}
InvokeAdd(source, label, area).Validate("Failed to add face example image");
}
/// <summary>
/// Removes all face examples added with the specified label.
/// </summary>
/// <param name="label">The label that identifies face for which examples will be removed.</param>
/// <exception cref="ObjectDisposedException">The <see cref="FaceRecognitionModel"/> has already been disposed of.</exception>
/// <returns>true if the examples are successfully removed; otherwise, false if there is no example labeled with the specified label.</returns>
/// <seealso cref="Add(MediaVisionSource, int)"/>
/// <seealso cref="Add(MediaVisionSource, int, Rectangle)"/>
/// <since_tizen> 4 </since_tizen>
public bool Remove(int label)
{
var ret = InteropModel.Remove(Handle, ref label);
if (ret == MediaVisionError.KeyNotAvailable)
{
return false;
}
ret.Validate("Failed to remove image example");
return true;
}
/// <summary>
/// Removes all face examples.
/// </summary>
/// <exception cref="ObjectDisposedException">The <see cref="FaceRecognitionModel"/> has already been disposed of.</exception>
/// <since_tizen> 4 </since_tizen>
public void Reset()
{
InteropModel.Reset(Handle).Validate("Failed to reset image example");
}
/// <summary>
/// Learns the face recognition model.
/// </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>
/// <exception cref="ObjectDisposedException">The <see cref="FaceRecognitionModel"/> 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()
{
Learn(null);
}
/// <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>
/// Releases all the resources used by the <see cref="FaceRecognitionModel"/> object.
/// </summary>
/// <since_tizen> 4 </since_tizen>
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
/// <summary>
/// Releases the resources used by the <see cref="FaceRecognitionModel"/> object.
/// </summary>
/// <param name="disposing">
/// true to release both managed and unmanaged resources; otherwise false to release only unmanaged resources.
/// </param>
/// <since_tizen> 4 </since_tizen>
protected virtual void Dispose(bool disposing)
{
if (_disposed)
{
return;
}
InteropModel.Destroy(_handle);
_disposed = true;
}
internal IntPtr Handle
{
get
{
if (_disposed)
{
throw new ObjectDisposedException(nameof(FaceRecognitionModel));
}
return _handle;
}
}
}
}