public void Transform(Bitmap bitmap)
{
var matrix = new double[, ]
{
{ 0, -1, 0 },
{ -1, 5, -1 },
{ 0, -1, 0 }
};
var w = matrix.GetLength(0);
var h = matrix.GetLength(1);
using (var wr = new ImageWrapper(bitmap)
{
DefaultColor = Color.Silver
})
foreach (var p in wr)
{
double r = 0d, g = 0d, b = 0d;
for (int i = 0; i < w; i++)
{
for (int j = 0; j < h; j++)
{
var pixel = wr[p.X + i - 1, p.Y + j - 1];
r += matrix[j, i] * pixel.R;
g += matrix[j, i] * pixel.G;
b += matrix[j, i] * pixel.B;
}
}
wr.SetPixel(p, r, g, b);
}
}
//....
private void Convolution(Bitmap img, double[,] matrix)
{
var w = matrix.GetLength(0);
var h = matrix.GetLength(1);
using (var wr = new ImageWrapper(img)
{
DefaultColor = Color.Silver
})
foreach (var p in wr)
{
double r = 0d, g = 0d, b = 0d;
for (int i = 0; i < w; i++)
{
for (int j = 0; j < h; j++)
{
var pixel = wr[p.X + i - 1, p.Y + j - 1];
r += matrix[j, i] * pixel.R;
g += matrix[j, i] * pixel.G;
b += matrix[j, i] * pixel.B;
}
}
wr.SetPixel(p, r, g, b);
}
}
Bitmap AddGaussianNoise(Bitmap bmp, float noisePower = 20)
{
Bitmap res = (Bitmap)bmp.Clone();
Random rnd = new Random();
using (ImageWrapper wrapper = new ImageWrapper(res)) {
foreach (var pixel in wrapper)
{
Color curColor = wrapper[pixel];
double noise = (rnd.NextDouble() + rnd.NextDouble() + rnd.NextDouble() + rnd.NextDouble() - 2) * noisePower;
wrapper.SetPixel(pixel, curColor.R + noise, curColor.G + noise, curColor.B + noise);
}
}
return(res);
}