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FAMS/ROC/IROCBuilder.cs

+/*
+ * Created by: Miguel Angel Medina Prez (miguel.medina.perez@gmail.com)
+ * Created: 
+ * Comments by: Miguel Angel Medina Prez (miguel.medina.perez@gmail.com)
+ */
+
+using System.Collections.Generic;
+
+namespace PatternRecognition.ROC
+{
+    /// <summary>
+    ///     Represents a point in the ROC curve.
+    /// </summary>
+    public struct ROCPoint
+    {
+        /// <summary>
+        ///     The value of the point in the horizontal axis.
+        /// </summary>
+        public double x;
+
+        /// <summary>
+        ///     The value of the point in the vertical axis.
+        /// </summary>
+        public double y;
+
+        public double matchingValue;
+
+        /// <summary>
+        ///     Initialize a point with the specified values of horizontal and vertical axis.
+        /// </summary>
+        /// <param name="x">
+        ///     The value of the new point in the horizontal axis.
+        /// </param>
+        /// <param name="y">
+        ///     The value of the new point in the vertical axis.
+        /// </param>
+        public ROCPoint(double x, double y, double matchingValue)
+        {
+            this.x = x;
+            this.y = y;
+            this.matchingValue = matchingValue;
+        }
+    }
+
+    /// <summary>
+    ///     Represents an algorithm to build ROC curves.
+    /// </summary>
+    public interface IROCBuilder
+    {
+        /// <summary>
+        ///     Build a ROC curve from the specified matching scores and score comparer.
+        /// </summary>
+        /// <param name="sameClassScores">
+        ///     A collection containing the matching scores of objects in the same class.
+        /// </param>
+        /// <param name="diffClassScores">
+        ///     A collection containing the matching scores of objects in different class.
+        /// </param>
+        /// <param name="scoreComparer">
+        ///     A comparer for matching scores.
+        /// </param>
+        /// <returns>
+        ///     The points that compose the ROC curve.
+        /// </returns>
+        List<ROCPoint> BuildROC(ICollection<double> sameClassScores, ICollection<double> diffClassScores, IComparer<double> scoreComparer);
+    }
+
+    internal enum MatchingType
+    {
+        Positive,
+        Negative
+    } ;
+
+    internal struct MatchingResult
+    {
+        internal MatchingType Type;
+        internal double ComparissonValue;
+        internal MatchingResult(MatchingType type, double dissimilarity)
+        {
+            Type = type;
+            ComparissonValue = dissimilarity;
+        }
+    }
+
+    internal class MatchingResultComparer : Comparer<MatchingResult>
+    {
+        public override int Compare(MatchingResult x, MatchingResult y)
+        {
+            int value = ValuesComparer.Compare(x.ComparissonValue, y.ComparissonValue);
+            return value == 0 ? ((x.Type == MatchingType.Negative) ? -1 : 1) : value;
+        }
+
+        internal IComparer<double> ValuesComparer { set; get; }
+    }
+}
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