如何將非託管圖像轉換爲託管位圖圖像？

Question

您好我需要將一個非託管圖像轉換爲託管位圖圖像，我需要顯示在一個圖片框，但我似乎拋出一個異常說「對象引用未設置爲一個對象的實例」。有沒有人有關於它的想法？我評論了引發異常的行。

for (int i = 0; i < characters.Length; i++) 
        { 
         area = characters[i].Area; 
         UnmanagedImage numer = characters[i].Image; 
         System.Drawing.Image plateImage = numer.ToManagedImage();//Exception 
         numberplate = new Bitmap(new Bitmap(plateImage)); 
         pictureBox2.Image = numberplate; 
         pictureBox2.Refresh();        
        } 

我使用Aforge.net框架，C＃

UPDATE

for (int i = 0; i < characters.Length; i++) 
        { 
         area = characters[i].Area; 
         Bitmap numer = characters[i].Image.ToManagedImage(); 
         //System.Drawing.Image plateImage = numer.ToManagedImage(); 
         //numberplate = new Bitmap(new Bitmap(plateImage)); 
         pictureBox2.Image = numberplate; 
         pictureBox2.Refresh();        
        } 

Answer 1

嗨這段代碼我在Aforge.Net論壇上發現，它似乎工作。

     BlobCounterBase bc = new BlobCounter(); 
        bc.FilterBlobs = true; 
        bc.MinHeight = 5; 
        bc.MinWidth = 5; 

        bc.ProcessImage(numberplate); 
        Blob[] blobs = bc.GetObjectsInformation(); 
        MessageBox.Show(bc.ObjectsCount.ToString()); 
        for (int i = 0, n = blobs.Length; i < n; i++) 
        { 
         if (blobs.Length > 0) 
         { 

          bc.ExtractBlobsImage(numberplate, blobs[i], true); 

          Bitmap copy = blobs[i].Image.ToManagedImage(); 
          pictureBox2.Image = numberplate; 
          pictureBox2.Refresh(); 
         } 
        } 

Answer 2

Bitmap managedImage = numer.ToManagedImage();