OpenCV 从视频中获取背景

来源：互联网发布：优酷mac缓存在哪里编辑：程序博客网时间：2024/05/16 11:31

本例是从一段视频中，获取背景，去掉前景物体。思路是，N帧叠加再取平均值，只要N足够，即可以消除前景物体。

#include <iostream>  #include "opencv2/opencv.hpp"  #include "opencv2/nonfree/features2d.hpp"#include "opencv2/highgui.hpp"using namespace cv;using namespace std;void OverlayMat(Mat& src, unsigned int iBgk[240][960]){int nRows = 240;int nCols = 320 * 3;for (int i = 0; i < nRows; ++i){uchar* p = src.ptr<uchar>(i);for (int j = 0; j < nCols; ++j){iBgk[i][j] += p[j];}}}int main(int argi, char** argv){printf("start!\n");VideoCapture cap;cap.open(argv[1]);if (!cap.isOpened()){printf("open file fail!\n");return -1;}printf("open file success!\n");Mat prevgray, gray, flow, cflow, frame;Mat bkg(240, 320, CV_8UC3);unsigned int iBkg[240][960] = { 0 };namedWindow("背景", 1);int total = 0;int temp = 0;for (;;){double t = (double)cvGetTickCount();if (!cap.read(frame))break;OverlayMat(frame, iBkg);total++;imshow("原始", frame);if (waitKey(10) >= 0)break;}cout << "total frames:" << total << endl;cap.release();int ch = 3;int nRows = 240;int nCols = 320 * ch;uchar* p;for (int i = 0; i < nRows; ++i){p = bkg.ptr<uchar>(i);for (int j = 0; j < nCols; ++j){p[j] = iBkg[i][j] / total;}}imshow("背景", bkg);if (waitKey(0) >= 0)return 0;return 0;}

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