Question

我正在尝试对图像（png）进行二值化，以获得以下结果enter image description here

为此，我使用以下代码，但是现在我没有预期的结果 enter image description here

Answer 1

您可以执行此操作，它使用扫描线和锁定位，而且速度相当快。

public unsafe static int[,] GetBits(string path )
{
   using (var orig = new Bitmap(path))
   {
      var bounds = new Rectangle(0, 0, orig.Width, orig.Height);    
      // lock the array for direct access
      var bitmapData = orig.LockBits(bounds, ImageLockMode.ReadWrite, PixelFormat.Format32bppPArgb);

      try
      {
         // get the pointer
         var scan0Ptr = (int*)bitmapData.Scan0;    
         // get the stride
         var stride = bitmapData.Stride / 4;    
         // keep the black around
         var black = Color.Black.ToArgb();    
         //Output
         var array = new int[orig.Width, orig.Height];

         // scan all x first then y
         for (var y = 0; y < bounds.Bottom; y++)
            for (var x = 0; x < bounds.Right; x++)                     
               array[x, y] = *(scan0Ptr + x + y * stride) == black ? 0 : 1;

         return array;    
      }
      finally
      {
         // unlock the bitmap
         orig.UnlockBits(bitmapData);
      }    
   }
}

用法

var array = GetBits(@"d:\icon.png");

var w = array.GetLength(0);
var h = array.GetLength(1);

for (int i = 0; i < w; i++)
{
   for (int j = 0; j < h; j++)
      Console.Write(array[i,j]);
   Console.WriteLine();
}

输出

00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00011111111111111111111111111000
00011111111111111111111111111000
00011000000000000000000000011000
00011000000000000000000000011000
00011000000000000000000000011000
00011000000000000000000000011000
00011000000000000000000000011000
00011000000000000000000000011000
00011000000000000000000000011000
00011000000000000000000000011000
00011000000000000000000000011000
00011000000000000000000000011000
00011000000000011111111111111000
00011000000000011111111111111000
00011000000000011000000000011000
00011000000000011000000000011000
00011000000000011000000000011000
00011000000000011000000000011000
00011000000000011000000000011000
00011000000000011000000000011000
00011000000000011000000000011000
00011000000000011000000000011000
00011000000000011000000000011000
00011000000000011000000000011000
00011111111111111111111111111000
00011111111111111111111111111000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000

原始图片32x32

Answer 2

要比较两种颜色，请使用ToArgb方法，最好使用StringBuilder而不是每次都串联。
这对我有用：

var img = new Bitmap(pictureBox1.Image);
var sb = new StringBuilder();

for (int i = 0; i < img.Height; i++)
{
    for (int j = 0; j < img.Width; j++)
    {
        if (img.GetPixel(j, i).ToArgb() == Color.White.ToArgb())
        {
            sb.Append("0");
        }
        else
        {
            sb.Append("1");
        }
    }
}

richTextBox1.Text = sb.ToString();

这会导致很多零和一些零，我的照片很大，因此结果很难看，但是在您的情况下应该可以。

将图像转换为字节矩阵

2 个答案: