opencv
다양한 미디어 형식로드 및 저장
수색…
이미지로드
#include <highgui.h>
//...
cv::Mat img = cv::imread("img.jpg");
...
비디오로드 중
cv::VideoCapture
사용법을 보여줍니다. 다음은 파일에서 비디오를로드하는 예제입니다.
#include "opencv2/highgui/highgui.hpp"
#include "opencv2/imgproc/imgproc.hpp"
#include "opencv2/core/core.hpp"
#include <iostream>
using namespace cv;
VideoCapture videoSource;
Mat frame;
#define VIDEO_PATH "video.avi"
int main()
{
//Open video
if (!videoSource.open(VIDEO_PATH))
{
std::cout<<"Video not found at "<<VIDEO_PATH<<std::endl;
return 1; // Exit if fail
}
videoSource.set(CV_CAP_PROP_CONVERT_RGB, 1);
int cameraWidth = videoSource.get(CV_CAP_PROP_FRAME_WIDTH);
int cameraHeight = videoSource.get(CV_CAP_PROP_FRAME_HEIGHT);
float cameraAspectRatio = cameraWidth / cameraHeight;
std::cout <<"Camera resolution: " << cameraWidth<<", "<<cameraHeight<<" aspect ratio: "<<cameraAspectRatio<< std::endl;
while(true)
{
videoSource >> frame;
if(frame.empty())
break;
//Resize frame
cv::resize(frame, frame, cv::Size(320, 320 / cameraAspectRatio));
imshow("frame", frame);
waitKey(20);
}
waitKey(0);
return 0;
}
라이브 캡처
웹캠과 함께 cv::VideoCapture
를 사용하는 방법을 보여줍니다. 웹캠에서 프레임 캡처 및 표시. 다음은 예제 코드입니다.
#include <iostream>
#include "opencv2/highgui/highgui.hpp"
#include "opencv2/imgproc/imgproc.hpp"
#include "opencv2/core/core.hpp"
using namespace cv;
VideoCapture videoSource;
Mat frame;
int main()
{
if(!videoSource.open(0)) //if more cameras available use 1,2,...
return 1;
while(true)
{
videoSource >> frame;
if(frame.empty())
break;
imshow("Webcam", frame); //or any kinf of precessing
if(waitKey(1)==27)
break;//stop capturing is ESC pressed
}
return 0;
}
동영상 저장하기
cv :: VideoWriter 사용법을 보여줍니다.
#include "opencv2/highgui/highgui.hpp"
#include <iostream>
using namespace cv;
using namespace std;
int main(int argc, char* argv[])
{
VideoCapture cap(0); // open the video camera no. 0
if (!cap.isOpened()) // if not success, exit program
{
cout << "ERROR: Cannot open the video file" << endl;
return -1;
}
namedWindow("MyVideo",CV_WINDOW_AUTOSIZE); //create a window called "MyVideo"
double dWidth = cap.get(CV_CAP_PROP_FRAME_WIDTH); //get the width of frames of the video
double dHeight = cap.get(CV_CAP_PROP_FRAME_HEIGHT); //get the height of frames of the video
cout << "Frame Size = " << dWidth << "x" << dHeight << endl;
Size frameSize(static_cast<int>(dWidth), static_cast<int>(dHeight));
VideoWriter oVideoWriter ("D:/MyVideo.avi", CV_FOURCC('P','I','M','1'), 20, frameSize, true); //initialize the VideoWriter object
if ( !oVideoWriter.isOpened() ) //if not initialize the VideoWriter successfully, exit the program
{
cout << "ERROR: Failed to write the video" << endl;
return -1;
}
while (1)
{
Mat frame;
bool bSuccess = cap.read(frame); // read a new frame from video
if (!bSuccess) //if not success, break loop
{
cout << "ERROR: Cannot read a frame from video file" << endl;
break;
}
oVideoWriter.write(frame); //writer the frame into the file
imshow("MyVideo", frame); //show the frame in "MyVideo" window
if (waitKey(10) == 27) //wait for 'esc' key press for 30ms. If 'esc' key is pressed, break loop
{
cout << "esc key is pressed by user" << endl;
break;
}
}
return 0;
}
이미지 저장
실제로 라이브 캡처 예제는 이미지를 캡처하는 데 적합하므로 이미지를 캡처하여 폴더에 저장하는 데 사용하고 있습니다.
#include <fstream>
#include <string>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/core/core.hpp>
#include <opencv2/imgproc/imgproc.hpp>
int main()
{
std::stringstream file; // to write the file name
cv::VideoCapture cap(0); // create a capture object
int counter = 0; // Create counter
while(true) // infinite loop
{
cv::Mat frame; // Create a object
cap.read(frame); // read the frame
file << "/home/user/path_to_your_folder/image" << counter << ".jpg"; // file name
cv::imwrite(file.str(), frame);
counter++; // increment the counter
}
return 0;
}
Modified text is an extract of the original Stack Overflow Documentation
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