使用DirectShow.NET在C＃的IVideoWindow上显示半透明的Image对象 [英] Showing a semi-transparent Image object over an IVideoWindow in C# using DirectShow.NET

问题描述

我一直在使用DirectShow.NET与C＃中的网络摄像头进行交互，到目前为止，一切都进行得很顺利。但是，现在，我正在尝试建立一种裁剪图像的方法（尽管该图像仍在显示为网络摄像头预览）。

I've been using DirectShow.NET to interface with a webcam in C# and so far everything has been going smoothly. However, right now I'm working on trying to set up a method to "crop" an image (while it's still being displayed as a webcam preview).

基本上，我试图在IVideoWindow对象的顶部显示某种基本透明的图像。但是，使用C＃来处理透明性还差得很远。

Basically, I'm trying to show some kind of a mostly transparent image on top of the IVideoWindow object. Dealing with transparency in C#, however, has been pretty far from a cakewalk.

那么，如何在IVideoWindow之上层叠Image对象？谢谢！

So, how can I layer an Image object on top of an IVideoWindow? Thanks!

推荐答案

有两种方法可以实现此目的：

There are two approaches how to achieve this:

• 可以使用视频转换过滤器并将混合的视频传递到渲染器（即图片+您的叠加层）


• 或使用VMR的 mixerbitmap功能来在演示时覆盖

DirectShow.NET 具有上面提到的第二个示例：

DirectShow.NET has a sample for the second mentioned above:

示例\ VMR9\BitMapMixer
BitmapMixer是如何使用VMR9在视频上绘制内容的示例。

Samples\VMR9\BitMapMixer BitmapMixer is an example of how to draw things over a video using VMR9.

那里的另一个示例：

示例\播放器\DxText
一个示例应用程序，展示了如何在数据流上叠加文本字符串。流是从avi文件中读取的。

Samples\Players\DxText A sample application showing how to superimpose text strings on a datastream. The stream is read from an avi file.

MSDN论坛。

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