Question

我在以wpf-Image形式显示图像（uEye-Cam）时遇到了一些问题。显示的图像完全是白色的。以下是我用过的代码：

//Get Cam Bitmap Image
var cam = new uEye.Camera();
cam.Init();
cam.Memory.Allocate();
cam.Acquisition.Capture(uEye.Defines.DeviceParameter.DontWait);

Int32 s32MemId;
cam.Memory.GetActive(out s32MemId);
cam.Memory.Lock(s32MemId);

Bitmap bitmap;
cam.Memory.ToBitmap(s32MemId, out bitmap);

//WPF Image control
var image1 = new System.Windows.Controls.Image();

//convert System.Drawing.Image to WPF image
var bmp = new System.Drawing.Bitmap(bitmap);
IntPtr hBitmap = bmp.GetHbitmap();
System.Windows.Media.ImageSource wpfBitmap =      System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(hBitmap, IntPtr.Zero,   Int32Rect.Empty, BitmapSizeOptions.FromEmptyOptions());

image1.Source = wpfBitmap;
image1.Stretch = System.Windows.Media.Stretch.UniformToFill;
image1.Visibility = Visibility.Visible;

DeleteObject(hBitmap);

可能是image1属性有什么问题还是..？

由于

WPF bitmap to image conversion shows a black image only

Answer 1

我在将每个新帧转换为位图方面取得了良好的效果，如问题所示：

Bitmap bmp;

cam.Memory.ToBitmap(s32MemId, out bmp);

然后使用：

将其转换为BitmapImage

BitmapImage bitmapImage = null;

using (System.IO.MemoryStream memory = new System.IO.MemoryStream())
{
    bitmapImage = new BitmapImage();
    bmp.Save(memory, System.Drawing.Imaging.ImageFormat.Bmp);
    memory.Position = 0;
    bitmapImage.BeginInit();
    bitmapImage.StreamSource = memory;
    bitmapImage.CacheOption = BitmapCacheOption.OnLoad;
    bitmapImage.EndInit();
}

然后锁定并冻结（如How do you pass a BitmapImage from a background thread to the UI thread in WPF?中）BitmapImage，使用以下方法将其设置为Image控件的源：

Object tempLock = new Object();
BitmapImage lastBitmapImage = null;

lock (tempLock)
{ 
    lastBitmapImage = bitmapImage.Clone();
}
lastBitmapImage.Freeze();

最后，将BitmapImage设置为Image控件的源：

this.Dispatcher.Invoke(new Action(() =>
{
    imageDisplay.Source = lastBitmapImage;
}));

位图到图像转换仅显示白色图像

1 个答案: