public double Match()
{
try
{
Transparency = FingerprintTransparency.Current;
ReportSupport = Transparency.AcceptsPairing();
int totalRoots = EnumerateRoots();
// https://sourceafis.machinezoo.com/transparency/root-pairs
Transparency.LogRootPairs(totalRoots, Roots);
double high = 0;
int best = -1;
for (int i = 0; i < totalRoots; ++i)
{
double score = TryRoot(Roots[i]);
if (best < 0 || score > high)
{
high = score;
best = i;
}
ClearPairing();
}
// https://sourceafis.machinezoo.com/transparency/best-match
Transparency.LogBestMatch(best);
return(high);
}
catch (Exception)
{
CurrentInstance = new MatcherThread();
throw;
}
finally
{
Transparency = null;
}
}
public void Compute(MatcherThread thread)
{
MinutiaCount = thread.Count;
MinutiaScore = Parameters.MinutiaScore * MinutiaCount;
MinutiaFractionInProbe = thread.Count / (double)thread.Probe.Minutiae.Length;
MinutiaFractionInCandidate = thread.Count / (double)thread.Candidate.Minutiae.Length;
MinutiaFraction = 0.5 * (MinutiaFractionInProbe + MinutiaFractionInCandidate);
MinutiaFractionScore = Parameters.MinutiaFractionScore * MinutiaFraction;
SupportingEdgeSum = 0;
SupportedMinutiaCount = 0;
MinutiaTypeHits = 0;
for (int i = 0; i < thread.Count; ++i)
{
var pair = thread.Tree[i];
SupportingEdgeSum += pair.SupportingEdges;
if (pair.SupportingEdges >= Parameters.MinSupportingEdges)
{
++SupportedMinutiaCount;
}
if (thread.Probe.Minutiae[pair.Probe].Type == thread.Candidate.Minutiae[pair.Candidate].Type)
{
++MinutiaTypeHits;
}
}
EdgeCount = thread.Count + SupportingEdgeSum;
EdgeScore = Parameters.EdgeScore * EdgeCount;
SupportedMinutiaScore = Parameters.SupportedMinutiaScore * SupportedMinutiaCount;
MinutiaTypeScore = Parameters.MinutiaTypeScore * MinutiaTypeHits;
int innerDistanceRadius = Doubles.RoundToInt(Parameters.DistanceErrorFlatness * Parameters.MaxDistanceError);
double innerAngleRadius = Parameters.AngleErrorFlatness * Parameters.MaxAngleError;
DistanceErrorSum = 0;
AngleErrorSum = 0;
for (int i = 1; i < thread.Count; ++i)
{
var pair = thread.Tree[i];
var probeEdge = new EdgeShape(thread.Probe.Minutiae[pair.ProbeRef], thread.Probe.Minutiae[pair.Probe]);
var candidateEdge = new EdgeShape(thread.Candidate.Minutiae[pair.CandidateRef], thread.Candidate.Minutiae[pair.Candidate]);
DistanceErrorSum += Math.Max(innerDistanceRadius, Math.Abs(probeEdge.Length - candidateEdge.Length));
AngleErrorSum += Math.Max(innerAngleRadius, DoubleAngle.Distance(probeEdge.ReferenceAngle, candidateEdge.ReferenceAngle));
AngleErrorSum += Math.Max(innerAngleRadius, DoubleAngle.Distance(probeEdge.NeighborAngle, candidateEdge.NeighborAngle));
}
DistanceAccuracyScore = 0;
AngleAccuracyScore = 0;
int distanceErrorPotential = Parameters.MaxDistanceError * Math.Max(0, thread.Count - 1);
DistanceAccuracySum = distanceErrorPotential - DistanceErrorSum;
DistanceAccuracyScore = Parameters.DistanceAccuracyScore * (distanceErrorPotential > 0 ? DistanceAccuracySum / (double)distanceErrorPotential : 0);
double angleErrorPotential = Parameters.MaxAngleError * Math.Max(0, thread.Count - 1) * 2;
AngleAccuracySum = angleErrorPotential - AngleErrorSum;
AngleAccuracyScore = Parameters.AngleAccuracyScore * (angleErrorPotential > 0 ? AngleAccuracySum / angleErrorPotential : 0);
TotalScore = MinutiaScore
+ MinutiaFractionScore
+ SupportedMinutiaScore
+ EdgeScore
+ MinutiaTypeScore
+ DistanceAccuracyScore
+ AngleAccuracyScore;
ShapedScore = Shape(TotalScore);
}