/// <summary>
/// fügt alle <see cref="ImageObject"/>s des <see cref="ObjectLayer"/> zu den <see cref="Instances"/> hinzu
/// </summary>
/// <param name="instances">Datensatz</param>
/// <param name="objectLayer">auszuwertender <see cref="ObjectLayer"/></param>
public static void AddImageObjects(this Instances instances, ObjectLayer objectLayer)
{
foreach (var io in objectLayer.Objects)
{
instances.CreateWekaInstance(io);
}
}
/// <summary>
/// Klassifiziert eine Instanz
/// </summary>
/// <param name="classifier">Klassifikator</param>
/// <param name="instances">dem Klassifikator zugehöriger Datensatz</param>
/// <param name="features">Merkmale der Instanz</param>
/// <returns>Klassenname</returns>
public static string Classify(this Classifier classifier, Instances instances, IEnumerable <Tuple <string, double> > features)
{
var instance = instances.CreateWekaInstance(null, features, true);
var classIndex = classifier.classifyInstance(instance);
return(instances.classAttribute().value((int)classIndex));
}
/// <summary>
/// Klassifiziert ein <see cref="ImageObject"/> und weist ihm die Klasse zu
/// </summary>
/// <param name="classifier">Klassifikator</param>
/// <param name="instances">dem Klassifikator zugehöriger Datensatz</param>
/// <param name="imageObject"><see cref="ImageObject"/></param>
/// <param name="resolveClassByName">Auflösung für die Klassen</param>
/// <returns>Klasse</returns>
public static Class Classify(this Classifier classifier, Instances instances, ImageObject imageObject, Func <string, Class> resolveClassByName)
{
var instance = instances.CreateWekaInstance(imageObject, true);
var classIndex = classifier.classifyInstance(instance);
var @class = resolveClassByName(instances.classAttribute().value((int)classIndex));
imageObject.Class = @class;
return(@class);
}
/// <summary> /// erstellt eine WEKA-<see cref="Instance"/> aus einem <see cref="ImageObject"/> und fügt sie den <see cref="Instances"/> hinzu /// </summary> /// <param name="instances">Datensatz</param> /// <param name="imageObject"><see cref="ImageObject"/></param> /// <param name="forceAdd">wenn true wird eine unklassifizierte <see cref="Instance"/> dem Datensatz hinzugefügt, sonst wird keine <see cref="Instance"/> erzeugt</param> /// <returns>WEKA-<see cref="Instance"/>, eingehangen in den übergebenen Datensatz oder null</returns> public static Instance CreateWekaInstance(this Instances instances, ImageObject imageObject, bool forceAdd = false) => instances.CreateWekaInstance(imageObject.Class?.Name, imageObject.Features.Select(f => Tuple.Create(f.Name, f.Value)), forceAdd);