public override MtripletsFeature Extract(Bitmap image)
{
var minutiae = MinutiaeExtractor.ExtractFeatures(ImageProvider.AdaptImage(image));
var mtriplets = new List <MTriplet>();
var triplets = new Dictionary <int, int>();
foreach (var triangle in Delaunay2D.Triangulate(minutiae))
{
var idxArr = new[]
{
(short)triangle.A,
(short)triangle.B,
(short)triangle.C
};
var newMTriplet = new MTriplet(idxArr, minutiae);
var newHash = newMTriplet.GetHashCode();
if (!triplets.ContainsKey(newHash))
{
triplets.Add(newHash, 0);
mtriplets.Add(newMTriplet);
}
}
mtriplets.TrimExcess();
return(new MtripletsFeature(mtriplets, minutiae));
}
public override TicoFeatures Extract(Bitmap image)
{
var mtiae = MinutiaeExtractor.ExtractFeatures(image);
var dirImg = ImageOrietantionExtractor.ExtractFeatures(image);
return(new TicoFeatures(mtiae, dirImg));
}
public override JiangFeatures Extract(Bitmap image)
{
var minutiae = MinutiaeExtractor.ExtractFeatures(image);
var skeletonImg = SkeletonImageExtractor.ExtractFeatures(image);
var descriptorsList = new List <JiangMinutiaDescriptor>();
if (minutiae.Count <= 3)
{
return(new JiangFeatures(descriptorsList));
}
var mtiaIdx = new Dictionary <Minutia, int>();
for (var i = 0; i < minutiae.Count; i++)
{
mtiaIdx.Add(minutiae[i], i);
}
for (short idx = 0; idx < minutiae.Count; idx++)
{
var query = minutiae[idx];
var nearest = GetNearest(minutiae, query);
for (var i = 0; i < nearest.Length - 1; i++)
{
for (var j = i + 1; j < nearest.Length; j++)
{
var newMTriplet = new JiangMinutiaDescriptor(skeletonImg, minutiae, idx, nearest[i],
nearest[j]);
descriptorsList.Add(newMTriplet);
}
}
}
descriptorsList.TrimExcess();
return(new JiangFeatures(descriptorsList));
}
public override MtripletsFeature Extract(Bitmap image)
{
var minutiae = MinutiaeExtractor.ExtractFeatures(image);
var result = new List <MTriplet>();
var triplets = new Dictionary <int, int>();
var nearest = new short[minutiae.Count, NeighborsCount];
var distance = new double[minutiae.Count, NeighborsCount];
// Initializing distances
for (var i = 0; i < minutiae.Count; i++)
{
for (var j = 0; j < NeighborsCount; j++)
{
distance[i, j] = double.MaxValue;
nearest[i, j] = -1;
}
}
// Computing m-triplets
for (short i = 0; i < minutiae.Count; i++)
{
// Updating nearest minutiae
UpdateNearest(minutiae, i, nearest, distance);
// Building m-triplets
for (var j = 0; j < NeighborsCount - 1; j++)
{
for (var k = j + 1; k < NeighborsCount; k++)
{
if (nearest[i, j] != -1 && nearest[i, k] != -1)
{
if (i == nearest[i, j] || i == nearest[i, k] || nearest[i, j] == nearest[i, k])
{
throw new Exception("Wrong mtp");
}
var newMTriplet = new MTriplet(new[] { i, nearest[i, j], nearest[i, k] }, minutiae);
var newHash = newMTriplet.GetHashCode();
if (!triplets.ContainsKey(newHash))
{
triplets.Add(newHash, 0);
result.Add(newMTriplet);
}
}
}
}
}
result.TrimExcess();
return(new MtripletsFeature(result, minutiae));
}
public override PartialeFeatures Extract(Bitmap image)
{
var minutiae = MinutiaeExtractor.ExtractFeatures(image);
var result = new List <MinutiaTriplet>();
if (minutiae.Count > 3)
{
foreach (var triangle in Delaunay2D.Triangulate(minutiae))
{
var idxArr = new[]
{
(short)triangle.A,
(short)triangle.B,
(short)triangle.C
};
var newMTriplet = new MinutiaTriplet(idxArr, minutiae);
result.Add(newMTriplet);
idxArr = new[]
{
(short)triangle.A,
(short)triangle.C,
(short)triangle.B
};
newMTriplet = new MinutiaTriplet(idxArr, minutiae);
result.Add(newMTriplet);
idxArr = new[]
{
(short)triangle.B,
(short)triangle.A,
(short)triangle.C
};
newMTriplet = new MinutiaTriplet(idxArr, minutiae);
result.Add(newMTriplet);
idxArr = new[]
{
(short)triangle.B,
(short)triangle.C,
(short)triangle.A
};
newMTriplet = new MinutiaTriplet(idxArr, minutiae);
result.Add(newMTriplet);
idxArr = new[]
{
(short)triangle.C,
(short)triangle.A,
(short)triangle.B
};
newMTriplet = new MinutiaTriplet(idxArr, minutiae);
result.Add(newMTriplet);
idxArr = new[]
{
(short)triangle.C,
(short)triangle.B,
(short)triangle.A
};
newMTriplet = new MinutiaTriplet(idxArr, minutiae);
result.Add(newMTriplet);
}
}
result.TrimExcess();
return(new PartialeFeatures(result, minutiae));
}
