/// <summary>
/// Inserts Gaussian noise into a bitmap.
/// </summary>
/// <param name="origem">Bitmap to be processed</param>
/// <param name="montante">Standard deviation of perturbation for each color channel.</param>
/// <returns>New, speckled bitmap</returns>
/// <remarks>
/// This code uses Bitmap.GetPixel and SetPixel methods for clarity. An implementation using Bitmap.LockBits
/// and then directly modifying the image data may be faster, espectially for large images.
/// </remarks>
public static Bitmap AdicionarDesfoque(this Bitmap origem, double montante)
{
if (origem == null)
{
throw new ArgumentNullException("source");
}
Bitmap bitmap = null;
Bitmap tempBitmap = null;
try
{
var gerar = new DesfocagemGaussianaAleatoria(0.0, montante, Utilitarios.SementesAleatorias());
tempBitmap = new Bitmap(origem.Width, origem.Height);
for (int y = 0; y < tempBitmap.Height; y++)
{
for (int x = 0; x < tempBitmap.Width; x++)
{
var pixel = origem.GetPixel(x, y);
Color newPixel = AdicionarPixelsDesfoque(pixel, gerar);
tempBitmap.SetPixel(x, y, newPixel);
}
}
bitmap = tempBitmap;
tempBitmap = null;
}
finally
{
if (tempBitmap != null)
{
tempBitmap.Dispose();
}
}
return(bitmap);
}
static Color AdicionarPixelsDesfoque(Color pixel, DesfocagemGaussianaAleatoria generator)
{
int newR = (int)pixel.R + generator.ProximoInteiro();
int newG = (int)pixel.G + generator.ProximoInteiro();
int newB = (int)pixel.B + generator.ProximoInteiro();
int r = Math.Max(0, Math.Min(newR, 255));
int g = Math.Max(0, Math.Min(newG, 255));
int b = Math.Max(0, Math.Min(newB, 255));
return(Color.FromArgb(r, g, b));
}
