View source for Using OpenCV from C++


== Using OpenCV from C++ ==

Install libopencv-dev

 apt-get install libopencv-dev

= Capture a frame from USB Camera =

Create the file DisplayImage.cpp

 #include "opencv2/opencv.hpp"
 
 using namespace cv;
 
 int main(int, char**)
 {
     VideoCapture cap(0); // open the default camera
     if(!cap.isOpened())  // check if we succeeded
         return -1;
 
     cap.set(CV_CAP_PROP_FRAME_WIDTH,1280);
     cap.set(CV_CAP_PROP_FRAME_HEIGHT,1024);
 
     Mat frame;
     cap >> frame; // get a new frame from camera
     // do any processing
     imwrite("/tmp/image.png", frame);
     return 0;
 }

Create the CMakeLists.txt file

 cmake_minimum_required(VERSION 2.8)
 project( CaptureImage )
 find_package( OpenCV REQUIRED )
 add_executable( CaptureImage CaptureImage.cpp )
 target_link_libraries( CaptureImage ${OpenCV_LIBS} )

Compile

 cmake .
 make