Gunnar Farnebak的算法计算稠密光流

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Computes a dense optical flow using the Gunnar Farneback’s algorithm.

用Gunnar Farnebak的算法计算稠密光流

C++: void calcOpticalFlowFarneback(InputArray prev, InputArray next, InputOutputArray flow, double pyr_scale, int levels, int winsize, int iterations, int poly_n, double poly_sigma, int flags)

示例：

#include "opencv2/video/tracking.hpp"#include "opencv2/imgproc/imgproc.hpp"#include "opencv2/highgui/highgui.hpp"#include <iostream>using namespace cv;using namespace std;

static void help(){cout <<"\nThis program demonstrates dense optical flow algorithm by Gunnar Farneback\n""Mainly the function: calcOpticalFlowFarneback()\n""Call:\n"

"./fback\n""This reads from video camera 0\n" << endl;}

static void drawOptFlowMap(const Mat& flow, Mat& cflowmap, int step,double, const Scalar& color){for(int y = 0; y < cflowmap.rows; y += step)for(int x = 0; x < cflowmap.cols; x += step){const Point2f& fxy = flow.at<Point2f>(y, x);line(cflowmap, Point(x,y), Point(cvRound(x+fxy.x), cvRound(y+fxy.y)),color);circle(cflowmap, Point(x,y), 2, color, -1);}}int main(int, char**){//VideoCapture cap(0);VideoCapture cap("E:\\图片\\视频材料\\Megamind.avi");help();if( !cap.isOpened() )return -1;Mat prevgray, gray, flow, cflow, frame;namedWindow("flow", 1);for(;;){cap >> frame;cvtColor(frame, gray, COLOR_BGR2GRAY);if( prevgray.data ){calcOpticalFlowFarneback(prevgray, gray, flow, 0.5, 3, 15, 3, 5, 1.2, 0);cvtColor(prevgray, cflow, COLOR_GRAY2BGR);drawOptFlowMap(flow, cflow, 16, 1.5, Scalar(0, 255, 0));imshow("flow", cflow);}if(waitKey(30)>=0)break;std::swap(prevgray, gray);}return 0;}

运行结果

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