如何在C ++中读取网络摄像头的输入？

Question

is it possible to read data from a generic webcam in C++ as you would from a stream object? Is there a common API or standard that works with all webcams?

I'm talking about C++ in *nix environment.

Thanks in advance.

Answer 1

For linux, V4L . AFAIR, BSD uses the same codebase. I do not know about the others...

Answer 2

In Linux, webcams are supported using Video4Linux . Take a look at the userspace API and an Video4Linux introduction .

Answer 3

您可能想检查网络摄像头是否与TWAIN兼容，并使用他们的api来做到这一点。

Answer 4

First find out if the web cam streams video or not? Typically they would stream the video to a particular port. You can then open a Socket in C++ on that port and get the video data. Most webcams should be able to do this.

The main thing here is you need to understand what video format does the webcam use and how to process it. Silverlight or DirectX will help as they can directly listen at the particular port, but you have not mentioned which OS you are using.

In case the web cam does not stream it should at least have the feature to save video to a file. In this case also find out the video format and that should help you decide which API to use.