从网络摄像头获取帧的最快方法 [英] Fastest way to get frames from webcam

问题描述

我在用C ++(Visual Studio)开发我的程序时遇到了一个小问题-目前，我在连接多个网络摄像头(通过usb电缆连接)时遇到了麻烦，为每个网络摄像头创建了单独的线程来捕获帧，和用于处理图像的单独框架.

I have a little wee of a problem developing one of my programs in C++ (Visual studio) - Right now im struggling with connection of multiple webcams (connected via usb cables), creating for each of them separate thread to capture frames, and separate frame for processing image.

我使用OpenCV处理帧，但问题是我没有达到网络摄像头的最高峰(​​它支持25 fps，我只有18)有一些库可以用来获取帧，而不是使用它们处理帧. OpenCV可以使帧捕获更快?

I use OpenCV to process frames, but the problem is that i dont get a peak of webcam possibilities (it supports 25 fps, i get only 18) is there some library that i could use to get frames, than process them with OpenCV that would made frames be captured faster?

我正在研究一下，最流行的方法是使用DirectShow获取帧，并使用OpenCV对其进行处理.

I was researching a bit and the most popular way is to use directshow to get frames and OpenCV to process them.

您同意吗?还是您有其他解决方案? 我不会被某些链接冒犯的:)

Do You agree? Or do You have another solution? I wouldn't be offended by some links :)

推荐答案

1. DirectShow仅在使用以下方式打开捕获时使用 CV_CAP_DSHOW标志，例如:

1. DirectShow is only used, if you open your capture using the CV_CAP_DSHOW flag, like:

VideoCapture capture( CV_CAP_DSHOW + 0 );  // 0,1,2, your cam id there

(没有它，默认为vfw)

(without it, it defaults to vfw )

捕获已经在单独的线程中运行，因此用更多线程包装它不会给您带来任何好处.

the capture already runs in a separate thread, so wrapping it with more threads won't give you any gain.

具有多个凸轮的另一个障碍是usb带宽，因此如果背面有端口&在机器的前部，不要将所有凸轮都插入相同的端口/控制器，否则您只会使其饱和

another obstacle with multiple cams is the usb bandwidth, so if you got ports on the back & the front of your machine, dont plug all your cams into the same port/controller else you just saturate it

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