/// <summary>
/// ........
/// ........
/// xxxxxxxx
/// xxxxxxxx
/// </summary>
private double Filter1(IntegralImage i, int x, int y, int w, int h)
{
int halfH = h / 2;
double a = i.CalculateArea(x, y + halfH, x + w - 1, y + h - 1);
double b = i.CalculateArea(x, y, x + w - 1, y + halfH - 1);
return(Subtract(a, b));
}
/// <summary>
/// ...xxx...
/// ...xxx...
/// ...xxx...
/// <summary>
private double Filter5(IntegralImage i, int x, int y, int w, int h)
{
int thirdW = w / 3;
double a = i.CalculateArea(x + thirdW, y, x + 2 * thirdW - 1, y + h - 1);
double b = i.CalculateArea(x, y, x + thirdW - 1, y + h - 1) +
i.CalculateArea(x + 2 * thirdW, y, x + w - 1, y + h - 1);
return(Subtract(a, b));
}
/// <summary>
/// xxxxxxxx
/// xxxxxxxx
/// xxxxxxxx
/// xxxxxxxx
/// </summary>
private double Filter0(IntegralImage i, int x, int y, int w, int h)
{
double a = i.CalculateArea(x, y, x + w - 1, y + h - 1);
double b = 0;
return(Subtract(a, b));
}
