private int CalcularLaplace(Bitmap bmp, int i, int j, OperadorPassaAlta kernel)
{
int somaR = 0, somaG = 0, somaB = 0;
int ki = 0, kj = 0;
for (int mi = (i - 1); mi <= (i + 1); mi++)
{
for (int mj = (j - 1); mj <= (j + 1); mj++)
{
somaR += bmp.GetPixel(mi, mj).R *kernel.X[ki, kj];
somaG += bmp.GetPixel(mi, mj).G *kernel.X[ki, kj];
somaB += bmp.GetPixel(mi, mj).B *kernel.X[ki, kj];
kj++;
}
ki++;
kj = 0;
}
int media = (int)Math.Round((somaR + somaB + somaG) / 3.0);
if (media < 0)
{
media = 0;
}
if (media > 255)
{
media = 255;
}
return(media);
}
public Bitmap AplicarEfeito(Bitmap bitmap, object parameter)
{
var p = parameter?.ToString();
Mascara mascara = (Mascara)Enum.Parse(typeof(Mascara), p ?? nameof(Mascara.Prewitt));
OperadorPassaAlta kernel = MascaraHelper.GetKernel(mascara);
double escala = (double)MascaraHelper.GetFatorEscala(mascara);
Bitmap bm = new Bitmap(bitmap.Width, bitmap.Height);
for (int i = 1; i < bitmap.Width - 1; i++)
{
for (int j = 1; j < bitmap.Height - 1; j++)
{
int c = 0;
if (mascara == Mascara.LaPlaciano)
{
c = CalcularLaplace(bitmap, i, j, kernel);
}
else
{
c = Calcular(bitmap, i, j, escala, kernel);
}
bm.SetPixel(i, j, Color.FromArgb(c, c, c));
}
}
return(bm);
}
/// <summary>
/// Implementação sem a magnitude
/// </summary>
private int Calcular(Bitmap bmp, int i, int j, double escala, OperadorPassaAlta kernel)
{
int somaR = 0, somaG = 0, somaB = 0;
int ki = 0, kj = 0;
for (int mi = (i - 1); mi <= (i + 1); mi++)
{
for (int mj = (j - 1); mj <= (j + 1); mj++)
{
Color color = bmp.GetPixel(mi, mj);
somaR += color.R * kernel.X[ki, kj] + color.R * kernel.Y[ki, kj];
somaG += color.G * kernel.X[ki, kj] + color.G * kernel.Y[ki, kj];
somaB += color.B * kernel.X[ki, kj] + color.B * kernel.Y[ki, kj];
kj++;
}
ki++;
kj = 0;
}
double media = (somaR + somaB + somaG) / 3.0;
if (media > 255)
{
media = 255;
}
else if (media < 0)
{
media = 0;
}
return((int)media);
}
/// <summary>
/// Tentativa de implementação usando a magnitude dos vetores
/// </summary>
private int CalcularSqrt(Bitmap bmp, int i, int j, double escala, OperadorPassaAlta kernel)
{
int Rx = 0, Ry = 0;
int Gx = 0, Gy = 0;
int Bx = 0, By = 0;
int ki = 0, kj = 0;
for (int mi = (i - 1); mi <= (i + 1); mi++)
{
for (int mj = (j - 1); mj <= (j + 1); mj++)
{
Color color = bmp.GetPixel(mi, mj);
Rx += color.R * kernel.X[ki, kj];
Gx += color.B * kernel.X[ki, kj];
Bx += color.G * kernel.X[ki, kj];
Ry += color.R * kernel.Y[ki, kj];
Gy += color.B * kernel.Y[ki, kj];
By += color.G * kernel.Y[ki, kj];
kj++;
}
ki++;
kj = 0;
}
var mr = Math.Sqrt(Math.Pow(Rx, 2) + Math.Pow(Ry, 2)) / escala;
var mg = Math.Sqrt(Math.Pow(Gx, 2) + Math.Pow(Gy, 2)) / escala;
var mb = Math.Sqrt(Math.Pow(Bx, 2) + Math.Pow(By, 2)) / escala;
double media = (mr + mg + mb) / 3.0;
if (media > 255)
{
media = 255;
}
return((int)media);
}