c# - 如何绘制/覆盖图像文件到位图图像？

Question

我有一个来自 Kinect 传感器的视频源，该视频由存储为位图的图像托管。我的问题是如何将图像(例如 .png)叠加到视频源上。

视频源显示为位图源，如下所示，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位图？

KinectVideo.Source = BitmapSource.Create(colorFrame.Width, colorFrame.Height, 96, 96,
                    PixelFormats.Bgr32, null, colorData, colorFrame.Width * colorFrame.BytesPerPixel); 

下面是我试图通过将图像放在视频源上来实现的模型:

更新了绘图方法的实现，我认为这不是正确的实现，我在将图像路径添加到 .DrawImage 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; 


            }
        }

Answer 1

要创建合并图像，您可以使用 DrawingContext为您提供 DrawText 或 DrawImage 等方法，然后使用 RenderTargetBitmap.Render 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;