如何順序更改WPF中沒有UI延遲的圖像源？

Question

我從USB獲取圖像的序列，並抓住每個圖像我將抓取的結果轉換爲System.Drawing.Bitmap，然後將其轉換爲System.Windows.Mesia.Imging.BitmapImage以便能夠將它分配給Imagesource和最後在調度程序線程中更新UI，所有這些過程都需要時間並且不會實時生效，相機公司（Basler）的示例代碼使用C＃並直接將System.Drawing.Bitmap分配給圖片框，並且可以不顯示實時視圖延遲。 什麼是處理它的最佳解決方案？值得一提的是2048 * 2000像素大小的幀速率幾乎是50 fps的

PixelDataConverter converter = new PixelDataConverter(); 
      Bitmap bitmap = new Bitmap(grabResult.Width, grabResult.Height, PixelFormat.Format32bppRgb); 
      BitmapData bmpData = bitmap.LockBits(new Rectangle(0, 0, bitmap.Width, bitmap.Height), ImageLockMode.ReadWrite, bitmap.PixelFormat); 
      converter.OutputPixelFormat = PixelType.BGRA8packed; 
      IntPtr ptrBmp = bmpData.Scan0; 
      converter.Convert(ptrBmp, bmpData.Stride * bitmap.Height, grabResult); 
      bitmap.UnlockBits(bmpData); 

      BitmapImage bitmapimage = new BitmapImage(); 
      using (MemoryStream memory = new MemoryStream()) 
      { 
       bitmap.Save(memory, ImageFormat.Bmp); 
       memory.Position = 0; 
       bitmapimage.BeginInit(); 
       bitmapimage.StreamSource = memory; 
       bitmapimage.CacheOption = BitmapCacheOption.OnLoad; 
       bitmapimage.EndInit(); 
       bitmapimage.Freeze(); 
      } 
      Dispatcher.Invoke(new Action(() => 
      { 
       imgMain.Source = bitmapimage; 
      })); 

這是公司爲C＃示例代碼：

Bitmap bitmap = new Bitmap(grabResult.Width, grabResult.Height, PixelFormat.Format32bppRgb); 
        // Lock the bits of the bitmap. 
        BitmapData bmpData = bitmap.LockBits(new Rectangle(0, 0, bitmap.Width, bitmap.Height), ImageLockMode.ReadWrite, bitmap.PixelFormat); 
        // Place the pointer to the buffer of the bitmap. 
        converter.OutputPixelFormat = PixelType.BGRA8packed; 
        IntPtr ptrBmp = bmpData.Scan0; 
        converter.Convert(ptrBmp, bmpData.Stride * bitmap.Height, grabResult); //Exception handling TODO 
        bitmap.UnlockBits(bmpData); 

        // Assign a temporary variable to dispose the bitmap after assigning the new bitmap to the display control. 
        Bitmap bitmapOld = pictureBox.Image as Bitmap; 
        // Provide the display control with the new bitmap. This action automatically updates the display. 
        pictureBox.Image = bitmap; 
        if (bitmapOld != null) 
        { 
         // Dispose the bitmap. 
         bitmapOld.Dispose(); 
        } 
       } 
enter code here 

Answer 1

使用Dispatcher.BeginInvoke代替Dispatcher.Invoke(...設置圖像異步。

 Dispatcher.BeginInvoke(DispatcherPriority.Input, new Action(() => 
     { 
      imgMain.Source = bitmapimage; 
     }));