OPENCV Self-study note 24. Raspberry Pi +opencv Read camera

Raspberry pi +opencv read camera

Call the camera on the Raspberry Pi, read each frame in the video stream, and use the canny edge detection to extract the edges in each frame, the final effect is as follows:

ReadVideo.cpp

#include "opencv2/opencv.hpp"

using namespace CV;

int main (int, char**)
{
    videocapture cap (0);//Open the default camera
    if (!cap.isopened ())  //Check if W E succeeded
        return-1;

    Mat edges;
    Namedwindow ("edges", 1);
    for (;;)
    {
        Mat frame;
        Cap >> frame; Get a new frame from camera

        cvtcolor (frame, edges, cv_bgr2gray);
        Gaussianblur (edges, edges, Size (7,7), 1.5, 1.5);
        Canny (edges, edges, 0, 3);

        Imshow ("edges", edges);
        if (Waitkey () >= 0) break;
    The camera would be deinitialized automatically in Videocapture destructor
    return 0;
}

Note: code from OPENCV official website

CMakeLists.txt

Project (Readvideo)
find_package (OpenCV REQUIRED)
add_executable (readvideo readvideo)
target_link_ Libraries (Readvideo ${opencv_libs})

Compile

CMake.
Make

Run the program:./readvideo