public static Bitmap Convolve(Bitmap bmp, double[,] kernel)
{
var oldImage = new LockedBitmap(bmp);
var newImage = new LockedBitmap(bmp);
var midpoint = (int)System.Math.Floor(kernel.GetLength(0) / 2.0);
for (int i = 0; i < oldImage.Width; i++)
{
for (int j = 0; j < oldImage.Height; j++)
{
var accumulator = new Vector3d();
for (int x = 0; x < kernel.GetLength(0); x++)
{
var z = Clamp <int>(i + (x - midpoint), oldImage.Width - 1, 0);
for (int y = 0; y < kernel.GetLength(1); y++)
{
var w = Clamp <int>(j + (y - midpoint), oldImage.Height - 1, 0);
accumulator.X += kernel[x, y] * (byte)(oldImage[z, w].R * 255);
accumulator.Y += kernel[x, y] * (byte)(oldImage[z, w].G * 255);
accumulator.Z += kernel[x, y] * (byte)(oldImage[z, w].B * 255);
}
}
accumulator.X = Math.Ceiling(Clamp <double>(accumulator.X, 255, 0));
accumulator.Y = Math.Ceiling(Clamp <double>(accumulator.Y, 255, 0));
accumulator.Z = Math.Ceiling(Clamp <double>(accumulator.Z, 255, 0));
newImage[i, j] = new Color4((byte)accumulator.X, (byte)accumulator.Y, (byte)accumulator.Z, (byte)(oldImage[i, j].A * 255));
}
}
return(newImage.ExportBitmap());
}
public static Bitmap ConvolveWithDebug(Bitmap bmp, double[,] kernel, string logPath)
{
using (System.IO.StreamWriter file = new System.IO.StreamWriter(logPath, false))
{
var oldImage = new LockedBitmap(bmp);
var newImage = new LockedBitmap(bmp);
var midpoint = (int)System.Math.Floor(kernel.GetLength(0) / 2.0);
for (int i = 0; i < oldImage.Width; i++)
{
for (int j = 0; j < oldImage.Height; j++)
{
file.Write($"({i}, {j}) | ");
var accumulator = new Vector3d();
for (int x = 0; x < kernel.GetLength(0); x++)
{
if (i - midpoint < 0 || i + midpoint >= oldImage.Width)
{
continue;
}
var z = i + (x - midpoint);
for (int y = 0; y < kernel.GetLength(1); y++)
{
if (j - midpoint < 0 || j + midpoint >= oldImage.Height)
{
continue;
}
var w = j + (y - midpoint);
// if (z < 0 || z >= oldImage.Width || w < 0 || w >= oldImage.Height) continue;
//file.Write($"| {kernel[x, y] * (byte)(oldImage[z, w].R * 255)} (<{z}, {w}> {oldImage[z, w].R * 255} * {kernel[x, y]}) | \n");
accumulator.X += kernel[x, y] * (byte)(oldImage[z, w].R * 255);
accumulator.Y += kernel[x, y] * (byte)(oldImage[z, w].G * 255);
accumulator.Z += kernel[x, y] * (byte)(oldImage[z, w].B * 255);
}
}
accumulator.X = Math.Ceiling(Clamp <double>(accumulator.X, 255, 0));
accumulator.Y = Math.Ceiling(Clamp <double>(accumulator.Y, 255, 0));
accumulator.Z = Math.Ceiling(Clamp <double>(accumulator.Z, 255, 0));
file.Write($"= {accumulator.X}\n");
newImage[i, j] = new Color4((byte)accumulator.X, (byte)accumulator.Y, (byte)accumulator.Z, (byte)(oldImage[i, j].A * 255));
}
}
return(newImage.ExportBitmap());
}
}