wpf 如何将图像文件绘制/覆盖到位图图像？
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StackOverFlow
How to draw/overlay an image file to a bitmap image?
提问by Brian J
I have a video feed from a Kinect sensor hosted by an image stored as a bitmap. My question is how do I overlay an image, for example a .pngon to the video feed.
我有一个来自 Kinect 传感器的视频源，由存储为位图的图像托管。我的问题是如何叠加图像，例如.png在视频源上叠加。
The video feed is shown like show below as bitmap source, I know how to draw a line to the bitmap but how do I draw an image from resources to the it?
视频源显示如下所示作为位图源，我知道如何在位图上画一条线，但如何从资源中绘制图像到它？
KinectVideo.Source = BitmapSource.Create(colorFrame.Width, colorFrame.Height, 96, 96,
PixelFormats.Bgr32, null, colorData, colorFrame.Width * colorFrame.BytesPerPixel);
Below is a mock up of what I'm trying to achieve by placing the image over the video feed:
下面是我试图通过将图像放在视频源上来实现的模拟：
Updated implementation of drawing method,I don't think this is the correct implementation also I'm getting invalid argument error when adding image path to .DrawImage:
更新了绘图方法的实现，我认为这不是正确的实现，而且我在将图像路径添加到.DrawImage以下内容时遇到无效参数错误：
void myKinect_ColorFrameReady(object sender, ColorImageFrameReadyEventArgs e)
{
using (ColorImageFrame colorFrame = e.OpenColorImageFrame())
{
if (colorFrame == null) return;
byte[] colorData = new byte[colorFrame.PixelDataLength];
colorFrame.CopyPixelDataTo(colorData);
KinectVideo.Source = BitmapSource.Create(colorFrame.Width, colorFrame.Height, 96, 96,
PixelFormats.Bgr32, null, colorData, colorFrame.Width * colorFrame.BytesPerPixel);
Rect destRect2;
//drawing image overlay to video feed
var drawingVisual = new DrawingVisual();
var drawingContext = drawingVisual.RenderOpen();
drawingContext.DrawImage(BitmapSource.Create(colorFrame.Width, colorFrame.Height, 96, 96, PixelFormats.Bgr32, null, colorData, colorFrame.Width * colorFrame.BytesPerPixel),
new Rect(new Size(colorFrame.Width, colorFrame.Height)));
drawingContext.DrawImage("Images/boxbag.jpg", destRect2);
drawingContext.Close();
var mergedImage = new RenderTargetBitmap(colorFrame.Width, colorFrame.Height, 96, 96, PixelFormats.Pbgra32);
mergedImage.Render(drawingVisual);
KinectVideo.Source = mergedImage;
}
}
回答by dkozl
To create merged image you can use DrawingContextthat gives you methods like DrawTextor DrawImageand then render it using RenderTargetBitmap.Render:
要创建合并图像，您可以使用DrawingContext它为您提供类似DrawText或的方法DrawImage，然后使用RenderTargetBitmap.Render以下方法渲染它：
var drawingVisual = new DrawingVisual();
var drawingContext = drawingVisual.RenderOpen();
drawingContext.DrawImage(BitmapSource.Create(colorFrame.Width, colorFrame.Height, 96, 96, PixelFormats.Bgr32, null, colorData, colorFrame.Width * colorFrame.BytesPerPixel),
new Rect(new Size(colorFrame.Width, colorFrame.Height)));
var overlayImage = new BitmapImage(new Uri("Images/boxbag.jpg"));
drawingContext.DrawImage(overlayImage,
new Rect(x, y, overlayImage.Width, overlayImage.Height));
drawingContext.Close();
var mergedImage = new RenderTargetBitmap(colorFrame.Width, colorFrame.Height, 96, 96, PixelFormats.Pbgra32);
mergedImage.Render(drawingVisual);
KinectVideo.Source = mergedImage;
回答by Sheridan
If you just want display an Imageon top of another UI control, then you can either just declare one afterthe other UI elements, or set the Panel.ZIndexproperty:
如果您只想Image在另一个 UI 控件之上显示一个，那么您可以在其他 UI 元素之后声明一个，或者设置Panel.ZIndex属性：
<Grid>
<Border Background="Black" />
<Image Source="/AppName;component/Images/ImageName.jpg" Width="50" Height="50" />
</Grid>
Or:
或者：
<Grid>
<Image Source="/AppName;component/Images/ImageName.jpg"
Width="50" Height="50" Panel.ZIndex="1" />
<Border Background="Black" />
</Grid>
To find out how to data bind a BitmapImageto an Image.ItemsSourceproperty, please see the Bind Xaml bitmap imagequestion here on StackOverflow. To position the Imagein a specific place, you can either use the Image.Marginproperty or put it in a Canvasand use the Canvas.Leftand Canvas.Topproperties.
要了解如何将数据绑定BitmapImage到Image.ItemsSource属性，请参阅StackOverflow 上的绑定 Xaml 位图图像问题。要将Image放置在特定位置，您可以使用该Image.Margin属性或将其放入 aCanvas并使用Canvas.LeftandCanvas.Top属性。
