private static Tuple <double, double> CalcLinearFactors(KeyValuePair <string, MatOfFloat>[] hashArray, int j, int i)
{
//Console.WriteLine("Calculate matchpoint for " + hashArray[j].Key + " and " + hashArray[i].Key);
var bfMatches = new BFMatcher(NormTypes.L2, crossCheck: true).Match(hashArray[j].Value, hashArray[i].Value).OrderBy(o => o.Distance).Select(o => o.Distance);
var matches = bfMatches.Take(bfMatches.Count() / 2).ToArray();
var xes = new List <double>();
var yes = new List <double>();
for (int k = 0; k < matches.Length; k++)
{
xes.Add(k);
yes.Add(matches[k]);
}
var linearFactors = MathNet.Numerics.Fit.Line(xes.ToArray(), yes.ToArray());
//Console.WriteLine("\t\t x * " + linearFactors.Item2 + " + " + linearFactors.Item1);
return(linearFactors);
}