/// <summary>
/// Converts a Bitmap to an RGB structure with or without alpha-channel.
/// </summary>
/// <param name="Data">Bitmap</param>
/// <param name="alpha">Alpha-channel</param>
/// <returns>RGBA structure array</returns>
public static float[][,] ToRGB(this Bitmap Data, bool alpha = false)
{
BitmapData bmData = BitmapFormat.Lock32bpp(Data);
float[][,] rgb = BitmapMatrix.ToRGB(bmData, alpha);
BitmapFormat.Unlock(Data, bmData);
return(rgb);
}
/// <summary>
/// Appy filter.
/// </summary>
/// <param name="bmData">Bitmap data</param>
private unsafe void ApplyRGB(BitmapData bmData)
{
float[][,] rgb = BitmapMatrix.ToRGB(bmData, true);
this.filter.Apply(rgb[0]);
this.filter.Apply(rgb[1]);
this.filter.Apply(rgb[2]);
BitmapMatrix.FromRGB(rgb, bmData);
return;
}
/// <summary>
/// Apply filter.
/// </summary>
/// <param name="images">Bitmap array</param>
/// <returns>Bitmap</returns>
public Bitmap Apply(params Bitmap[] images)
{
// data
int N = images.GetLength(0);
float[][][,] data = new float[N][][, ];
int height = images[0].Height;
int width = images[1].Width;
float[][,] weights = new float[N][, ];
// to rgb array
for (int i = 0; i < N; i++)
{
data[i] = BitmapMatrix.ToRGB(images[i]);
}
// initialize weights
for (int i = 0; i < N; i++)
{
weights[i] = Matrice.One(height, width);
}
// applying params
weights = Mul(weights, Exp(data, this.sigma));
// normalizing
float[,] z = new float[height, width];
for (int i = 0; i < N; i++)
{
z = z.Add(weights[i]);
}
for (int i = 0; i < N; i++)
{
weights[i] = weights[i].Div(z);
}
// pyramids
float[][,] pyrW;
float[][,] pyrIr;
float[][,] pyrIg;
float[][,] pyrIb;
// outputs
float[][,] zero = gap.Forward(new float[height, width]);
float[][,] r = (float[][, ])zero.Clone();
float[][,] g = (float[][, ])zero.Clone();
float[][,] b = (float[][, ])zero.Clone();
int levels = r.GetLength(0);
// do job
for (int i = 0; i < N; i++)
{
pyrW = gap.Forward(weights[i]);
zero = data[i];
pyrIr = lap.Forward(zero[0]);
pyrIg = lap.Forward(zero[1]);
pyrIb = lap.Forward(zero[2]);
for (int l = 0; l < levels; l++)
{
z = pyrW[l];
r[l] = r[l].Add(z.Mul(pyrIr[l]));
g[l] = g[l].Add(z.Mul(pyrIg[l]));
b[l] = b[l].Add(z.Mul(pyrIb[l]));
}
}
// reconstruction
Bitmap bitmap = BitmapMatrix.FromRGB(new float[][, ] {
lap.Backward(r),
lap.Backward(g),
lap.Backward(b)
});
return(bitmap);
}