The following is the explanation to the C++ code to blur a video in C++ using the tool OpenCV.
Things to know:
(1) The code will only compile in Linux environment.
(2) To run in windows, please use the file: ‘blur_video.o’ and run it in cmd. However if it does not run(problem in system architecture) then compile it in windows by making suitable and obvious changes to the code like: Use <iostream.h> in place of <iostream>.
(3) Compile command: g++ w blur_vid.cpp o blur_vid `pkgconfig libs opencv`
(4) Run command: ./blur_vid
(5) The video Bumpy.mp4 has to be in the same directory as the code.
Before you run the code, please make sure that you have OpenCV installed on your // system.
Code Snippets Explained:
#include "opencv2/highgui/highgui.hpp" // highgui - an interface to video and image capturing. #include <opencv2/imgproc/imgproc.hpp> // For dealing with images #include <iostream> // The header files for performing input and output. using namespace cv; // Namespace where all the C++ OpenCV functionality resides. using namespace std; // For input output operations. int main() { VideoCapture cap("Bumpy.mp4"); // cap is the object of class video capture that tries to capture Bumpy.mp4 if ( !cap.isOpened() ) // isOpened() returns true if capturing has been initialized. { cout << "Cannot open the video file. \n"; return -1; } double fps = cap.get(CV_CAP_PROP_FPS); //get the frames per seconds of the video // The function get is used to derive a property from the element. // Example: // CV_CAP_PROP_POS_MSEC : Current Video capture timestamp. // CV_CAP_PROP_POS_FRAMES : Index of the next frame. namedWindow("A_good_name",CV_WINDOW_AUTOSIZE); //create a window called "MyVideo" // first argument: name of the window. // second argument: flag- types: // WINDOW_NORMAL : The user can resize the window. // WINDOW_AUTOSIZE : The window size is automatically adjusted to //fit the displayed image() ), and you cannot change the window size manually. // WINDOW_OPENGL : The window will be created with OpenGL support. while(1) { Mat frame; // Mat object is a basic image container. frame is an object of Mat. if (!cap.read(frame)) // if not success, break loop // read() decodes and captures the next frame. { cout<<"\n Cannot read the video file. \n"; break; } blur(frame,frame,Size(10,10)); // To blur the image. imshow("A_good_name", frame); // first argument: name of the window. // second argument: image to be shown(Mat object). if(waitKey(30) == 27) // Wait for 'esc' key press to exit { break; } } return 0; } // END OF PROGRAM