OpenCV 背景消除和提取

视频来源：https://www.youtube.com/watch?v=oHFr0R6jQ6I

以下代码用OpenCV实现了视频中背景消除和提取的建模，涉及到KNN（K近邻算法）和GMM（高斯混合模型）。

//
//  main.cpp
//  opencv-learning
//
//  Created by _R on 2019/1/9.
//  Copyright © 2019 _R. All rights reserved.
//

#include 
#include 

using namespace std;
using namespace cv;

int main(int argc, char* argv[])
{
    VideoCapture video = VideoCapture("/Users/_R/Desktop/Highway_Test_640x360_30p.mp4");
    if (!video.isOpened()) {
        cout << "could not load video file ..." << endl;
        return -1;
    }
    
    Mat frame, bgMask_MOG2, bgMask_KNN, background;
    Mat kernel = getStructuringElement(MORPH_RECT, Size(3,3));
    
    namedWindow("highway_test", WINDOW_AUTOSIZE);
    namedWindow("background_mask_by_MOG2", WINDOW_AUTOSIZE);
    namedWindow("background_by_KNN", WINDOW_AUTOSIZE);
    namedWindow("background_mask_by_KNN", WINDOW_AUTOSIZE);
    
    Ptr ptrMOG2 = createBackgroundSubtractorMOG2();
    Ptr ptrKNN = createBackgroundSubtractorKNN();
    
    while (video.read(frame)) {
        imshow("highway_test", frame);
        
        ptrMOG2->apply(frame, bgMask_MOG2);
        morphologyEx(bgMask_MOG2, bgMask_MOG2, MORPH_OPEN, kernel);
        ptrKNN->apply(frame, bgMask_KNN);
        ptrKNN->getBackgroundImage(background);
        
        imshow("background_by_KNN", background);
        imshow("background_mask_by_MOG2", bgMask_MOG2);
        imshow("background_mask_by_KNN", bgMask_KNN);
        
        char c = waitKey(50);
        if (c == 27) {
            break;
        }
    }
    waitKey(0);
    video.release();
    return 0;
}

效果展示

视频展示：https://www.bilibili.com/video/av40671522