如何使用OpenCV在视频上查找对象 [英] How to find object on video using OpenCV

问题描述

要在视频帧上跟踪对象，首先我从视频中提取图像帧，并将这些图像保存到文件夹。然后我应该处理这些图像来找到一个对象。实际上，我不知道这是否是一个实用的东西，因为所有的算法做到这一步。它是否正确？

解决方案

那么，你的方法会消耗大量的磁盘空间，取决于视频的大小和

您是否尝试过执行实时视频处理？如果你的算法不是太慢，有一些帖子，显示你需要做的事情：

• 这篇文章演示了如何使用OpenCV的C接口来执行一个函数，将网络摄像头捕获的帧（即时）转换为灰度和在屏幕上显示它们;


• 此post 显示了使用C ++界面检测图片中的正方形的简单方法;


• 这个帖子是上面的稍微变化，并且示出如何检测纸张;


• 此主题显示几种不同的方式来执行高级方形检测。

我相信你能够将代码从C接口转换到C ++接口。 / p>

To track object on video frame, first of all I extract image frames from video and save those images to a folder. Then I am supposed to process those images to find an object. Actually I do not know if this is a practical thing, because all the algorithm did this for one step. Is this correct?

解决方案

Well, your approach will consume a lot of space on your disk depending on the size of the video and the size of the frames, plus you will spend a considerable amount of time reading frames from the disk.

Have you tried to perform real-time video processing instead? If your algorithm is not too slow, there are some posts that show the things that you need to do:

• This post demonstrates how to use the C interface of OpenCV to execute a function to convert frames captured by the webcam (on-the-fly) to grayscale and displays them on the screen;
• This post shows a simple way to detect a square in an image using the C++ interface;
• This post is a slight variation of the one above, and shows how to detect a paper sheet;
• This thread shows several different ways to perform advanced square detection.

I trust you are capable of converting code from the C interface to the C++ interface.

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