public void WriteRGBToImage(string path, RGB[,] matrix)
{
var width = matrix.GetLength(0);
var height = matrix.GetLength(1);
using (var image = new Bitmap(width, height, PixelFormat.Format24bppRgb))
{
var data = image.LockBits(new Rectangle(0, 0, width, height), ImageLockMode.WriteOnly,
PixelFormat.Format24bppRgb);
unsafe
{
var pointer = (byte*)data.Scan0;
for (int i = 0; i < width; i++)
{
for (int j = 0; j < height; j++)
{
pointer[0] = (byte)matrix[i, j].R;
pointer[1] = (byte)matrix[i, j].G;
pointer[2] = (byte)matrix[i, j].B;
pointer += 3;
}
}
}
image.UnlockBits(data);
image.Save(path);
}
}
public RGB[,] ReadRGBFromImage(Stream stream)
{
using (var image = new Bitmap(stream))
{
int width = (int)(8 * Math.Ceiling(image.Width / 8.0));
int height = (int)(8 * Math.Ceiling(image.Height / 8.0));
var superBlock = new RGB[width, height];
BitmapData blockData = image.LockBits(new Rectangle(0, 0, image.Width, image.Height), ImageLockMode.ReadOnly, PixelFormat.Format24bppRgb);
unsafe
{
var pointer = (byte*)blockData.Scan0;
for (int i = 0; i < blockData.Width; i++)
{
for (int j = 0; j < blockData.Height; j++)
{
superBlock[i, j].R = pointer[0];
superBlock[i, j].G = pointer[1];
superBlock[i, j].B = pointer[2];
pointer += 3;
}
pointer += blockData.Stride - (blockData.Width * 3);
}
}
image.UnlockBits(blockData);
return superBlock;
}
}
public static YCrCb Parse(RGB rgb)
{
return new YCrCb
{
Y = calculateY(rgb),
Cr = calculateCr(rgb),
Cb = calculateCb(rgb),
};
}
public static void PrintMatrix(string name, RGB [,] matrix)
{
Console.WriteLine(name);
for (int i = 0; i < matrix.GetLength(0); i++)
{
for (int j = 0; j < matrix.GetLength(1); j++)
{
Console.Write((matrix[i, j].B).ToString().PadLeft(10, ' '));
}
Console.WriteLine();
}
Console.WriteLine();
}
public static YCrCb[,] Parse(RGB[,] rgb)
{
int m = rgb.GetLength(0);
int n = rgb.GetLength(1);
var matrix = new YCrCb[m, n];
for (int i = 0; i < m; i++)
{
for (int j = 0; j < n; j++)
{
matrix[i, j] = Parse(rgb[i, j]);
}
}
return matrix;
}
public static RGB[,] Parse(YCrCb[,] yCrCb)
{
int m = yCrCb.GetLength(0);
int n = yCrCb.GetLength(1);
var matrix = new RGB[m, n];
for (int i = 0; i < m; i++)
{
for (int j = 0; j < n; j++)
{
matrix[i, j] = Parse(yCrCb[i, j]);
}
}
return matrix;
}
private static double calculateY(RGB rgb)
{
return Math.Round(rgb.R * 0.299 + rgb.G * 0.587 + rgb.B * 0.114);
}
private static double calculateCr(RGB rgb)
{
return Math.Round(128 + (0.5 * rgb.R - 0.419 * rgb.G - 0.081 * rgb.B));
}
private static double calculateCb(RGB rgb)
{
return Math.Round(128 + (-0.169 * rgb.R - 0.331 * rgb.G + 0.5 * rgb.B));
}
