public void DoFilter(FastBitmap bitmap)
{
float[,] buffer = new float[bitmap.Width, bitmap.Height];
Parallel.For(0, bitmap.Height, j =>
{
for (int i = _size; i < bitmap.Width - _size; i++)
{
float pix = 0;
for (int k = -_size; k < _size; k++)
{
pix += bitmap[i + k, j] * _coefficients[k + _size];
}
buffer[i, j] = pix / _sumCoef;
}
});
Parallel.For(0, bitmap.Width, i =>
{
for (int j = _size; j < bitmap.Height - _size; j++)
{
float pix = 0;
for (int k = -_size; k < _size; k++)
{
pix += buffer[i, j + k] * _coefficients[k + _size];
}
bitmap[(int)i, j] = (byte)(pix / _sumCoef);
}
});
}
private int[] CountGistogram(FastBitmap bitmap)
{
int[] result = new int[256];
for (int i = 0; i < bitmap.Width; i++)
{
for (int j = 0; j < bitmap.Height; j++)
{
result[bitmap[i, j]]++;
}
}
return result;
}
public void DoFilter(FastBitmap bitmap)
{
int[] gistogramm = CountGistogram(bitmap);
int threshold = CountThreshold(gistogramm);
Parallel.For(0, bitmap.Width, i =>
{
for (int j = 0; j < bitmap.Height; j++)
{
bitmap[i, j] = (byte)(bitmap[i, j] < threshold ? 0 : 255);
}
});
}
public void DoFilter(FastBitmap bitmap)
{
int width = bitmap.Width;
int height = bitmap.Height;
int[,] windowX = new int[,] { { -1, 0, 1 }, { -2, 0, 2 }, { -1, 0, 1 } };
int[,] windowY = new int[,] { { 1, 2, 1 }, { 0, 0, 0 }, { -1, -2, -1 } };
byte[,] buffer = new byte[width, height];
Angulars = new double[width, height];
Parallel.For(1, width - 1, i =>
{
for (int j = 1; j < height - 1; j++)
{
int new_x = 0;
int new_y = 0;
for (int wi = -1; wi < 2; wi++)
{
for (int hj = -1; hj < 2; hj++)
{
new_x += windowX[wi + 1, hj + 1] * bitmap[i + hj, j + wi];
new_y += windowY[wi + 1, hj + 1] * bitmap[i + hj, j + wi];
}
}
double new_val = Math.Sqrt(new_x * new_x + new_y * new_y);
Angulars[i, j] = Math.Atan2(new_y, new_x);
if (new_val > 255) new_val = 255;
if (new_val < 0) new_val = 0;
buffer[i, j] = (byte)new_val;
}
});
Parallel.For(1, width - 1, i =>
{
for (int j = 1; j < height - 1; j++)
{
bitmap[i, j] = buffer[i, j];
}
});
}
