How to get temperature value

[HedgeHao]

I have a FLIR purethermal 3 module. I can get the video frame using OpenCV VideoCap in c++. How can I convert this OpenCV Mat data to actual temperature value?

#include <iostream>
#include <opencv2/core/core.hpp>
#include <opencv2/videoio/videoio.hpp>
#include <opencv2/highgui/highgui.hpp>

using namespace std;
using namespace cv;

int main()
{
 VideoCapture cap(0);
 if (!cap.isOpened())
 {
 cout << "Cannot open camera\n";
 return 1;
 }

 Mat frame;
 while (true)
 {
 bool ret = cap.read(frame);
 if (!ret)
 {
 cout << "Can't receive frame (stream end?). Exiting ...\n";
 break;
 }

 imshow("live", frame);
 if (waitKey(1) == 'q')
 {
 break;
 }
 }
 return 0;
}