c++ - I can't capture frames from camera in OpenCV -

i trying detect eyes have problem. cannot display camera frame. problem can obvious newbie. part of code below:

here eyedetection.h

#include <opencv2/imgproc/imgproc.hpp> #include <opencv2/highgui/highgui.hpp> #include <opencv2/objdetect/objdetect.hpp>  using namespace cv;  class eyedetection { private:     cascadeclassifier eye_cascade, eyepair_cascade; public:     eyedetection();     void detect(); };  

here eyedetection.cpp

#include "eyedetection.h"  eyedetection::eyedetection() {     eye_cascade.load("haarcascade_eye.xml");     eyepair_cascade.load("haarcascade_mcs_eyepair_big.xml"); }  void eyedetection::detect() {     videocapture webcam(1); //webcam number 1     if (eyepair_cascade.empty() || eye_cascade.empty() || !(webcam).isopened())         return;      webcam.set(cv_cap_prop_frame_width, 800);     webcam.set(cv_cap_prop_frame_height, 600);      mat frame;     while (1) {         webcam >> frame;         if (frame.empty()) continue;         imshow("asad", frame);     } } 

and here source.cpp(main):

#include "eyedetection.h"  using namespace cv;  int main(int argc, char** argv) {     eyedetection e = eyedetection();     e.detect();     return 0; } 

it not show camera frame, shows blank gray window. problem?

1. please check camera id 1. if have 1 connected camera please replace camera id 0 instead 1.

cv2.videocapture(1) cv2.videocapture(0)

2. add waitkey() line add line @ end of loop

`

while (1) {         webcam >> frame;         if (frame.empty()) continue;         imshow("asad", frame);         cv2.waitkey(0)     } 

` maybe check waitkey() should needed you. thanks.