Hi there, Can anyone suggest a good way to grab an image from a webcam every 10 seconds and then display the timestamp on the image? I was able to get the following to work, but it only displays the timestamp the very first time it is called and does not update the timestamp, so looking for a better method. Thanks in advance -Scott
include "stdafx.h"
include <ctime>
include <iostream>
include "opencv2/highgui/highgui.hpp"
include "opencv2/imgproc/imgproc.hpp"
include <stdio.h>
include <stdlib.h>
using namespace cv; using namespace std;
Mat base_mat; time_t time_current; time_t time_future;
int time_zero = 0;
const int NUM_SECONDS = 10;
///Declare Functions Header void Text_On_Image( Mat image_name, String win_name, String img_text);
int _tmain(int argc, _TCHAR* argv[]) { time_t t = time(0); // get time now struct tm * now = localtime( & t ); time_current = now->tm_min; now->tm_year + 1900; now->tm_mon + 1; now->tm_mday; Mat base_mat(200,200, CV_8UC3, Scalar(0,0,0)); //RGB
Mat src= cv::imread("C:\\Users\\Public\\Pictures\\Opencv_images\\video.jpg");
cv::imshow("my_meter", src);
int waitKeyValue = 1000;
int count = 1;
double time_counter = 0;
clock_t this_time = clock();
clock_t last_time = this_time;
//Try to grab single frames at time stamps
/*
while(true)
{
this_time = clock();
time_counter += (double)(this_time - last_time);
last_time = this_time;
if(time_counter > (double)(NUM_SECONDS * CLOCKS_PER_SEC))
{
time_counter -= (double)(NUM_SECONDS * CLOCKS_PER_SEC);
printf("%d\n", count);
count++;
}
printf("DebugTime = %f\n", time_counter);
}
*/
cv::Mat san;
cv::VideoCapture san_cap(0);
if (san_cap.isOpened()) {
while (1) {
san_cap.read(san);
string time_hours = static_cast<ostringstream*>( &(ostringstream() << now->tm_hour) )->str(); //convert contour count to a string
string time_minutes = static_cast<ostringstream*>( &(ostringstream() << now->tm_min) )->str(); //convert contour count to a string
string time_seconds = static_cast<ostringstream*>( &(ostringstream() << now->tm_sec) )->str(); //convert contour count to a string
cv::putText(san, time_hours + ":" + time_minutes + ":" + time_seconds, cvPoint(30,150), FONT_HERSHEY_COMPLEX_SMALL, 0.8, cvScalar(200,200,250), 1, CV_AA);
cv::imshow("gp", san);
int key = cv::waitKey(waitKeyValue);
if(key!=-1)cout<<key<<endl;
if (key == 27 || key == 1048586) {
if (waitKeyValue == 10)waitKeyValue = 0;
else waitKeyValue = 10;
}
}
} else cout << "videoCapture not working" << endl;
return 0;
}
void Text_On_Image( Mat image_name, String win_name, String img_text) { cv::putText(image_name, img_text, cvPoint(1,30), FONT_HERSHEY_COMPLEX_SMALL, 0.6, cvScalar(255,255,255), 1, CV_AA); imshow( win_name, image_name );
}
