如何使用 C++ 中的 OpenCV 從其他攝像機捕獲影片?
在本主題中,我們將確定如何使用 OpenCV 從其他攝像機捕獲影片。訪問除預設攝像機外的其他攝像機與訪問預設攝像機類似。僅有一點不同,即我們必須分配攝像機號,而不是使用“VideoCapture cap(0)”。攝像機號根據 USB 埠的順序確定。如果攝像機連線到第三個 USB 埠,則攝像機號為 3。
以下程式訪問第三個攝像機,並顯示從攝像機獲取的即時影片流。
示例
#include<opencv2/opencv.hpp>//OpenCV header to use VideoCapture class//
#include<iostream>
using namespace std;
using namespace cv;
int main() {
Mat myImage;//Declaring a matrix to load the frames//
namedWindow("Video Player");//Declaring the video to show the video//
VideoCapture cap(3);//Declaring an object to capture stream of frames from third camera//
if (!cap.isOpened()){ //This section prompt an error message if no video stream is found//
cout << "No video stream detected" << endl;
system("pause");
return-1;
}
while (true){ //Taking an everlasting loop to show the video//
cap >> myImage;
if (myImage.empty()){ //Breaking the loop if no video frame is detected//
break;
}
imshow("Video Player", myImage);//Showing the video//
char c = (char)waitKey(25);//Allowing 25 milliseconds frame processing time and initiating break condition//
if (c == 27){ //If 'Esc' is entered break the loop//
break;
}
imshow("Video Player", myImage);//Showing the video//
char c = (char)waitKey(25);//Allowing 25 milliseconds frame processing time and initiating break condition//
if (c == 27){ //If 'Esc' is entered break the loop//
break;
}
}
cap.release();//Releasing the buffer memory//
return 0;
}輸出

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