/// <summary>
/// Quantizes the bitmap with the given code book.
/// </summary>
/// <param name="bitmap">The bitmap.</param>
/// <param name="codeBook">The code book.</param>
/// <returns></returns>
public static byte[] QuantizeImage(Bitmap bitmap, VQCodeBook codeBook)
{
VQBlock[] blocks = CreateBlocks(bitmap, codeBook.BlockWidth, codeBook.BlockHeight);
byte[] result = new byte[blocks.Length];
double dump = 0.0;
for (int i = 0; i < blocks.Length; i++)
{
VQBlock block = blocks[i];
result[i] = (byte)Nearest(block, codeBook.Entries, codeBook.Entries.Length, ref dump);
}
return(result);
}
private byte[] BitmapToRawVQResized(Bitmap source, int size, int minSize, VQCodeBook codeBook)
{
if (size > minSize)
{
minSize = size;
}
// Resize the image
Bitmap img = new Bitmap(minSize, minSize, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
using (System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(img))
{
using (ImageAttributes attr = new ImageAttributes())
{
attr.SetWrapMode(WrapMode.TileFlipXY);
g.InterpolationMode = InterpolationMode.HighQualityBicubic;
g.DrawImage(source, new Rectangle(0, 0, size, size), 0, 0, source.Width, source.Height, GraphicsUnit.Pixel, attr);
}
}
return(VectorQuantizer.QuantizeImage(img, codeBook));
}
private byte[] BitmapToRawVQ(Bitmap source, int codeBookSize, out byte[][] palette)
{
Bitmap img = source;
byte[] destination = new byte[img.Width * img.Height];
// If this is not a 32-bit ARGB bitmap, convert it to one
if (img.PixelFormat != System.Drawing.Imaging.PixelFormat.Format32bppArgb)
{
Bitmap newImage = new Bitmap(img.Width, img.Height, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
using (System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(newImage))
{
g.DrawImage(img, 0, 0, img.Width, img.Height);
}
img = newImage;
}
//Create code book
m_codeBook = VectorQuantizer.CreateCodebook(img, codeBookSize / 4);
//Write palette
palette = new byte[codeBookSize][];
for (int i = 0; i < m_codeBook.Entries.Length; i++)
{
byte[] pixels = m_codeBook.Entries[i].ToArray();
for (int j = 0; j < 4; j++)
{
int paletteIndex = i * 4 + j;
palette[paletteIndex] = new byte[4];
palette[paletteIndex][0] = pixels[j * 4 + 3];
palette[paletteIndex][1] = pixels[j * 4 + 2];
palette[paletteIndex][2] = pixels[j * 4 + 1];
palette[paletteIndex][3] = pixels[j * 4];
}
}
//Quantize image
return(VectorQuantizer.QuantizeImage(img, m_codeBook));
}
/// <summary>
/// Quantizes the bitmap.
/// </summary>
/// <param name="bitmap">The bitmap.</param>
/// <param name="blockWidth">Width of the block.</param>
/// <param name="blockHeight">Height of the block.</param>
/// <param name="codebookSize">Size of the codebook as block count.</param>
/// <param name="palette">The palette.</param>
/// <returns></returns>
public static byte[] QuantizeImage(Bitmap bitmap, int codeBookSize, int blockWidth = 2, int blockHeight = 2)
{
VQCodeBook codeBook = CreateCodebook(bitmap, codeBookSize, blockWidth, blockHeight);
return(QuantizeImage(bitmap, codeBook));
}