private static void Extract(
Minutiaes minutiaes,
byte[] p,
int i,
int j,
int offset,
int stride,
MinutiaeType type
)
{
//p[offset + 0] = 250;
//p[offset + 1] = 120;
//p[offset + 2] = 0;
if (minutiaes.ContainsKey(type))
{
minutiaes[type].Add((j / 3, i));
}
else
{
minutiaes[type] = new List <(int X, int Y)>()
{
(j / 3, i)
}
};
}
public Minutiae(int x, int y, double angle, MinutiaeType type)
{
this.X = x;
this.Y = y;
this.Angle = angle;
this.Type = type;
this.IsMatching = false;
}
public static Dictionary <Point, MinutiaeType> DetectMinutiae(WriteableBitmap bitmap)
{
Dictionary <Point, MinutiaeType> points = new Dictionary <Point, MinutiaeType>();
using (BitmapContext context = bitmap.GetBitmapContext())
{
int width = context.Width;
int height = context.Height;
int[] mask = new int[9];
for (int x = 1; x < width - 1; ++x)
{
for (int y = 1; y < height - 1; ++y)
{
if (PixelHelper.IsBlack(context, x, y))
{
mask[0] = PixelHelper.IsWhite(context, x, y + 1) ? 0 : 1;
mask[1] = PixelHelper.IsWhite(context, x - 1, y + 1) ? 0 : 1;
mask[2] = PixelHelper.IsWhite(context, x - 1, y) ? 0 : 1;
mask[3] = PixelHelper.IsWhite(context, x - 1, y - 1) ? 0 : 1;
mask[4] = PixelHelper.IsWhite(context, x, y - 1) ? 0 : 1;
mask[5] = PixelHelper.IsWhite(context, x + 1, y - 1) ? 0 : 1;
mask[6] = PixelHelper.IsWhite(context, x + 1, y) ? 0 : 1;
mask[7] = PixelHelper.IsWhite(context, x + 1, y + 1) ? 0 : 1;
mask[8] = mask[0];
MinutiaeType cn = CalculateCN(mask);
if (IsMinutiae(cn))
{
points.Add(new Point(x, y), cn);
if (cn == MinutiaeType.Point)
{
PixelHelper.SetPixel(context, x, y, Colors.Red);
}
else if (cn == MinutiaeType.Ending)
{
PixelHelper.SetPixel(context, x, y, Colors.Green);
}
else if (cn == MinutiaeType.Fork)
{
PixelHelper.SetPixel(context, x, y, Colors.Yellow);
}
else if (cn == MinutiaeType.Crossing)
{
PixelHelper.SetPixel(context, x, y, Colors.DeepPink);
}
}
}
}
}
}
return(points);
}
private static bool IsMinutiae(MinutiaeType CN) => CN != MinutiaeType.Invalid;
public Minutiae(int x, int y, MinutiaeType type)
{
X = x;
Y = y;
Type = type;
}
