/// <summary>
/// Deserialize the ROC curve from the specified file name.
/// </summary>
/// <param name="fileName">
/// The file name where the ROC curve is serialized.
/// </param>
/// <param name="xLabel">
/// The label of horizontal axis in the ROC curve.
/// </param>
/// <param name="yLabel">
/// The label of vertical axis in the ROC curve.
/// </param>
/// <param name="matcherName">
/// The name of the fingerprint matcher.
/// </param>
/// <returns>
/// The points composing the ROC curve.
/// </returns>
public static List <ROCPoint> Deserialize(string fileName, out string xLabel, out string yLabel, out string matcherName)
{
var roc = new List <ROCPoint>();
using (var sr = new StreamReader(fileName))
{
matcherName = sr.ReadLine();
var line = sr.ReadLine();
var splitStringArray = new string[1] {
";"
};
var members = line.Split(splitStringArray, StringSplitOptions.None);
xLabel = members[0];
yLabel = members[1];
// Read lines from the file until the end of the file is reached.
while ((line = sr.ReadLine()) != null)
{
members = line.Split(splitStringArray, StringSplitOptions.None);
var rocPoint = new ROCPoint(Convert.ToDouble(members[0]), Convert.ToDouble(members[1]), Convert.ToDouble(members[2]));
roc.Add(rocPoint);
}
sr.Close();
}
return(roc);
}
private List <ROCPoint> BuildROC(IList <MatchingResult> sortedResults, int negativeCount, int positiveCount)
{
int fp = 0;
int tp = 0;
var curve = new List <ROCPoint>();
double latter = double.MinValue;
for (int i = 0; i < sortedResults.Count; i++)
{
MatchingResult mr = sortedResults[i];
if (mr.ComparissonValue != latter)
{
ROCPoint rocPoint = new ROCPoint(100.0 * fp / negativeCount, 100.0 * tp / positiveCount, mr.ComparissonValue);
if (curve.Count > 1)
{
if (curve[curve.Count - 2].x == rocPoint.x)
{
curve[curve.Count - 1] = rocPoint;
}
else
if (curve[curve.Count - 2].y == rocPoint.y)
{
curve[curve.Count - 1] = rocPoint;
}
else
{
curve.Add(rocPoint);
}
}
else
{
curve.Add(rocPoint);
}
latter = mr.ComparissonValue;
}
if (mr.Type == MatchingType.Positive)
{
tp++;
}
else
{
fp++;
}
}
curve.Add(new ROCPoint(100, curve[curve.Count - 1].y, curve[curve.Count - 1].matchingValue));
curve.Add(new ROCPoint(100, 100, curve[curve.Count - 1].matchingValue));
return(curve);
}