Hi.I use below code for video capture from my webcam:
Mat frame;
int threshval =120;
static void on_trackbar(int, void*)
{
}
int main(int argc, char* argv[])
{
VideoCapture cap(0);
if (!cap.isOpened())
{
cout << "Cannot open the video cam" << endl;
return 0;
}
while (1)
{
bool bSuccess = cap.read(frame); // Khandane yek frame jadid dar video
if (!bSuccess)
{
cout << "Cannot read a frame from video stream" << endl;
break;
}
createTrackbar("Threshold", "Image", &threshval, 255, on_trackbar);
on_trackbar(threshval, 0);}
return 0; }
I want to use a function that takes the image from video capture class and convert that frame to a gray level image and use Canny Edge Detector for that image.for this reason I use this function:
int my_cannyEdgeDetector(){
cvtColor(frame, frame2, COLOR_BGR2GRAY);
Canny(frame2, frame2, threshval, threshval * 2, 3);}
I know I wrote the wrong function but I'm begginer in opencv and c++ and I want to get pictures from the main function and put it in the my_cannyEdgeDetector function and imshow frame and frame2 in the end of my main function.I have no idea to set input and output for my_cannyEdgeDetector function.Thank you very much if you help me do this