将栅格转换为矢量？

Question

我目前正在编写一个代码片段，通过使用填充将栅格图像转换为矢量图像而不使用任何跟踪方法。它的工作原理，但对于960px * 800px图像，输出的大小可能会变得非常大（160 MB）。寻找能够让我了解如何构建某种位置数组的人，这些位置在每个相应的填充块中包含相同的颜色。我检查谷歌没有运气。以下是代码段的样子。

public static unsafe void SaveVector(this Image @this, Stream outputStream)
{

  int PixelSize = 4;
  Rectangle rect = new Rectangle(new Point(0,0), @this.Size);                       
  using(StreamWriter SvgWriter = new StreamWriter(outputStream))
  {
    using(Bitmap bitmap = new Bitmap(@this))
    {
      BitmapData bitmapData = bitmap.LockBits(rect, ImageLockMode.ReadOnly,PixelFormat.Format32bppArgb);
      SvgWriter.WriteLine("<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\"?>");
      SvgWriter.WriteLine("<svg");
      SvgWriter.WriteLine("   xmlns:svg=\"http://www.w3.org/2000/svg\"");
      SvgWriter.WriteLine("   xmlns=\"http://www.w3.org/2000/svg\"");
      SvgWriter.WriteLine(string.Format("   width=\"{0}\"", @this.Width));
      SvgWriter.WriteLine(string.Format("   height=\"{0}\"", @this.Height));
      SvgWriter.WriteLine("   id=\"svg2\"");
      SvgWriter.WriteLine("   version=\"1.1\">");
      SvgWriter.WriteLine("  <defs");
      SvgWriter.WriteLine("     id=\"defs4\" />");
      SvgWriter.WriteLine("  <metadata");
      SvgWriter.WriteLine("     id=\"metadata7\" />");
      SvgWriter.WriteLine("  <g");
      SvgWriter.WriteLine("     id=\"layer1\">");
      int num = 0;              
      for(int y = 0; y < bitmapData.Height; y++)
      {
        byte* row=(byte *)bitmapData.Scan0+(y*bitmapData.Stride);
        for(int x = 0; x < bitmapData.Width; x++)
        {
          SvgWriter.WriteLine("    <rect");                         
          SvgWriter.WriteLine(string.Format("       style=\"fill:{0};fill-opacity:1;stroke-width:0.43599999000000000;stroke-miterlimit:4;stroke-dasharray:none\"", 
            ColorTranslator.ToHtml(Color.FromArgb(
              row[(x * PixelSize) + 3],
              row[(x * PixelSize) + 2],
              row[(x * PixelSize) + 1],
              row[x * PixelSize]))));
          SvgWriter.WriteLine(string.Format("       id=\"rect{0}\"", num));
          SvgWriter.WriteLine("       width=\"1\"");
          SvgWriter.WriteLine("       height=\"1\"");
          SvgWriter.WriteLine(string.Format("       x=\"{0}\"", x));
          SvgWriter.WriteLine(string.Format("       y=\"{0}\" />", y));                         
          num++;
        }                       
      }
      bitmap.UnlockBits(bitmapData);
    }
    SvgWriter.WriteLine("  </g>");
    SvgWriter.WriteLine("</svg>");
  }
}