RaspberryPi C++ app compile issue using OpenCV and Raspicam - c++

Question

Using the code below, I am trying to create an app in C++ with OpenCV + Raspicam. This app should stream video in real time from the RasPi camera model connected to my Pi to an Xwindow.
I get the following error on compile:
videofeed.cpp: In function ‘int main(int, char**)’:
videofeed.cpp:36:37: error: ‘cv::imread’ is not a member of ‘raspicam::RaspiCam_Cv’
How do I remedy this?
#include "opencv2/highgui/highgui.hpp"
#include "opencv2/videoio.hpp"
#include <iostream>
#include </home/pi/raspicam-0.1.3/src/raspicam_cv.h>
using namespace std;
int main ( int argc,char **argv ) {
raspicam::RaspiCam_Cv Camera;
cv::Mat image;
int nCount=100;
//set camera params
Camera.set( CV_CAP_PROP_FORMAT, CV_8UC1 );
//Open camera
cout<<"Opening Camera..."<<endl;
if (!Camera.open())// if not success, exit program
{
cout << "Cannot open the video cam" << endl;
return -1;
}
double dWidth = Camera.get(CV_CAP_PROP_FRAME_WIDTH); //get the width of frames o$
double dHeight = Camera.get(CV_CAP_PROP_FRAME_HEIGHT); //get the height of frame$
cout << "Frame size : " << dWidth << " x " << dHeight << endl;
cv::namedWindow("MyVideo",CV_WINDOW_AUTOSIZE); //create a window called "MyVideo"
while (1)
{
cv::Mat frame;
bool bSuccess = Camera.cv::imread(frame); // get a new frame from camera
if (!bSuccess) //if not success, break loop
{
cout << "Cannot read a frame from video stream" << endl;
break;
}
cv::imshow("MyVideo", frame); //show the frame in "MyVideo" window
if (cv::waitKey(30) == 27) //wait for 'esc' key press for 30ms. If 'esc' ke$
{
cout << "esc key is pressed by user" << endl;
break;
}
}
return 0;
}
///////////////////////////////////////////////////////////////////////////////////

Answer 1

bool bSuccess = Camera.cv::imread(frame); is an error,there is no imreadfunciton in raspicam::RaspiCam_Cv.If you want grub a frame,you can use function grub and than retrieve .
For example:
Mat img;
camera.grab();
camera.retrieve(img);
You can see the declaration:
/**
* Grabs the next frame from video file or capturing device.
*/
bool grab();
/**
*Decodes and returns the grabbed video frame.
*/
void retrieve ( cv::Mat& image );
Also ,you can get example in:https://github.com/cedricve/raspicam