Simple motion detection with OpenCV - 간단한 움직임 감지

Detects motions in the vision and saves an image of it as a PNG file. Adjust the sensitivity value if needed.

카메라 영상의 움직임을 감시하고 움직임이 감지된 순간의 영상을 저장한다. sensitivity 값으로 감도를 조절한다.

#include <opencv2/opencv.hpp>
 
using namespace std;
using namespace cv;
 
int main(int argc, char** argv)
{
    VideoCapture cap(0);
 
    Mat frameNew;
    Mat frameOld;
    Mat frameDiff;
 
    double min, max;
    int sensitivity = 100;
    int detectionCount = 0;
 
    cap >> frameOld;
 
    while (true)
    {
        cap >> frameNew;
        if (frameNew.empty())
            break;
 
        // Calculates the per-element absolute difference
        // between two arrays or between an array and a scalar.
        absdiff(frameNew, frameOld, frameDiff);
        cvtColor(frameDiff, frameDiff, COLOR_BGR2GRAY);
        minMaxLoc(frameDiff, &min, &max);
 
        if (max > sensitivity)
        {
            cout << "Motion detected. (Max: " << max << ")" << endl;
 
            // For PNG, it can be the compression level from 0 to 9.
            // A higher value means a smaller size and longer compression time.
            vector<int> compression_params;
            compression_params.push_back(IMWRITE_PNG_COMPRESSION);
            compression_params.push_back(3);
            if (imwrite(format("detection_%03d.png", detectionCount++), frameNew, compression_params))
                cout << "Image saved." << endl;
            else
                cout << "Image not saved." << endl;
        }
 
        imshow("Motion Detectoion", frameDiff);
        
        frameNew.copyTo(frameOld);
 
        if (waitKey(10) == 27)
            break;
    }
 
    return 0;
}

<frameDiff>

<Detection_XXX.png>