WPF 使用 Windowsformhost 嵌入 emgu.cv 3.1.0.2282 的ImageBox 播放 USB摄像头视频

WPF Emgu.CV ImageBox USB

在本文中，我们将深入探讨如何在WPF（Windows Presentation Foundation）应用中利用WindowsFormHost控件嵌入Emgu.CV 3.1.0.2282库的ImageBox组件，以便实现实时播放USB摄像头视频。Emgu.CV是一个开源的计算机视觉库，它为.NET开发者提供了对OpenCV的强大支持，而ImageBox是Emgu.CV用于显示图像的控件。我们需要确保安装了Emgu.CV库。Emgu.CV 3.1.0.2282版本提供了丰富的API，用于处理图像和视频流。要安装此库，可以使用NuGet包管理器，在项目中搜索并添加"Emgu.CV"包。接着，为了在WPF中使用WindowsFormHost控件，需要引入以下命名空间： ```xml ``` 然后，在XAML文件中，添加一个WindowsFormHost控件，并为其分配一个名称，例如 "imageHost"： ```xml ``` 接下来，我们需要在代码后面实现摄像头的捕获和图像显示。在后台代码中，首先初始化Emgu.CV的相关组件，如VideoCapture对象，用于从USB摄像头读取视频流： ```csharp using Emgu.CV; using Emgu.CV.Structure; public partial class MainWindow : Window { private VideoCapture capture; public MainWindow() { InitializeComponent(); InitializeCamera(); } private void InitializeCamera() { capture = new VideoCapture(0); // 0表示默认的USB摄像头 Application.Idle += new EventHandler(OnApplicationIdle); } private void OnApplicationIdle(object sender, EventArgs e) { if (capture.IsOpened()) { Mat frame = new Mat(); capture.Read(frame); Image image = frame.ToImage(); ImageBox imageBox = new ImageBox(image); imageHost.Child = imageBox; // 将ImageBox添加到WindowsFormHost } } } ``` 在上述代码中，我们通过VideoCapture对象的Read方法获取每一帧图像，并将其转换为Emgu.CV的Image对象。然后创建一个新的ImageBox实例，将图像传递给它，并设置为WindowsFormHost的子控件。这样，每次应用程序进入空闲状态时，都会更新ImageBox中的图像，实现摄像头视频的实时播放。要注意的是，由于WPF与Windows Forms之间的兼容性问题，可能需要处理一些潜在的问题，如线程同步和UI更新。在实际应用中，可能需要使用Dispatcher或Invoke方法确保在正确的线程上更新UI。此外，如果你的系统上有多个摄像头，可以通过更改VideoCapture构造函数中的参数来选择不同的设备，如`new VideoCapture(1)`代表第二个摄像头。在项目的"References"中，还需要添加对"System.Windows.Forms"和"PresentationCore"、"PresentationFramework"、"WindowsBase"等WPF相关的引用。通过结合WPF、WindowsFormHost和Emgu.CV，我们可以轻松地在WPF应用中实现USB摄像头的视频播放功能。在开发过程中，要时刻注意跨平台兼容性、性能优化以及错误处理，以提供稳定且高效的用户体验。

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WPF 使用 Windowsformhost 嵌入 emgu.cv 3.1.0.2282 的ImageBox 播放 USB摄像头 视频

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WPF 使用 Windowsformhost 嵌入 emgu.cv 3.1.0.2282 的ImageBox 播放 USB摄像头视频