我正在使用支持1280 x 720 @ 60 fps的网络摄像头。
我的电脑环境是intel i5-4690K和Windows7,Visual studio 2015,opencv 3.1
当我在Kinovea(0.85.15,https://www.kinovea.org/)运行网络摄像头时,相机以1280 x 720 @ 60fps运行。
但是,在使用Opencv的Visual Studio中,它不起作用@ 60 fps。
它只能工作12~15 fps。
我检查相机fps的代码如下。
#include <stack>
#include <iostream>
#include <math.h>
#include "opencv2/highgui/highgui.hpp"
#include "opencv2/imgproc/imgproc.hpp"
#include "opencv2/videoio.hpp"
#include <opencv2/video.hpp>
#include "opencv2/imgcodecs.hpp"
#include <time.h>
using namespace cv;
using namespace std;
int keyboard;
int main(int argc, char** argv)
{
VideoCapture cap(0); //capture the video from web cam
if (!cap.isOpened()) // if not success, exit program
{
cout << "Cannot open the web cam" << endl;
return -1;
}
cap.set(CV_CAP_PROP_FRAME_WIDTH, 1280);
cap.set(CV_CAP_PROP_FRAME_HEIGHT, 720);
while ((char)keyboard != 'q' && (char)keyboard != 27)
{
Mat imgOriginal;
Mat ROOI;
clock_t a = clock();
bool bSuccess = cap.read(imgOriginal);
if (!bSuccess)
{
cout << "Cannot read a frame from video stream" << endl;
break;
}
printf("Captue Time : %f\n", double(clock() - a) / double(CLOCKS_PER_SEC));
imshow("Original", imgOriginal);
if (waitKey(1) == 27)
{
cout << "esc key is pressed by user" << endl;
break;
}
}
return 0;
}
在上面的代码中。我检查“捕获时间”,它通常记录0.07s~0.09s。
所以,我尝试使用VideoCapture :: set(CV_CAP_PROP_FPS,60),但它不起作用。 (当我使用代码VideoCapture :: get(CV_CAP_PROP_FPS)获取FPS时,它返回值0.)
如何控制网络摄像头FPS?
谢谢。
当我像下面那样修改我的代码时,它的工作速度为@ 60 fps。
#include <stack>
#include <iostream>
#include <math.h>
#include "opencv2/highgui/highgui.hpp"
#include "opencv2/imgproc/imgproc.hpp"
#include "opencv2/videoio.hpp"
#include <opencv2/video.hpp>
#include "opencv2/imgcodecs.hpp"
#include <time.h>
using namespace cv;
using namespace std;
int keyboard;
int main(int argc, char** argv)
{
VideoCapture cap(0); //capture the video from web cam
if (!cap.isOpened()) // if not success, exit program
{
cout << "Cannot open the web cam" << endl;
return -1;
}
cap.set(CV_CAP_PROP_FOURCC, CV_FOURCC('M', 'J', 'P', 'G'));
cap.set(CV_CAP_PROP_FRAME_WIDTH, 1280);
cap.set(CV_CAP_PROP_FRAME_HEIGHT, 720);
while ((char)keyboard != 'q' && (char)keyboard != 27)
{
Mat imgOriginal;
Mat ROOI;
clock_t a = clock();
bool bSuccess = cap.read(imgOriginal);
if (!bSuccess)
{
cout << "Cannot read a frame from video stream" << endl;
break;
}
printf("Captue Time : %f\n", double(clock() - a) / double(CLOCKS_PER_SEC));
imshow("Original", imgOriginal);
if (waitKey(1) == 27)
{
cout << "esc key is pressed by user" << endl;
break;
}
}
return 0;
}
摄像机工作的关键是@ 60 fps
cap.set(CV_CAP_PROP_FOURCC, CV_FOURCC('M', 'J', 'P', 'G'));
我的相机在MJPG模式下工作@ 60 fps。所以我添加上面的代码,它工作正常!
您可以尝试在OpenCV之外设置相机的帧速率,例如在Linux上,你可以使用libwebcam控制UVC相机(罗技等),特别是uvcdynctrl。