我正在尝试使用光流，但没有绘制光流线，而只是点，有什么问题？这是该项目的源代码。通过调试器查看。GDB 总是显示p0.x = p1.x and p0.y = p1.y. 但为什么 ？对不起，我的英语不好。
#include "opencv/cv.h"
#include "opencv2/core/core.hpp"
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/imgproc/imgproc.hpp>
#include <opencv2/objdetect/objdetect.hpp>
#include <opencv2/opencv.hpp>
#include <iostream>
#include <stdio.h>
std::vector<cv::Point2f> corners;
std::vector<cv::Point2f> corners_b;
double qualityLevel = 0.01;
double minDistance = 10;
int blockSize = 3;
bool useHarrisDetector = false;
double k = 0.04;
int maxCorners = 200;
int maxTrackbar = 100;
void MotionDetection(cv::Mat frame1, cv::Mat frame2)
{
cv::Mat prev, next;
cvtColor(frame1, prev, CV_BGR2GRAY);
cvtColor(frame2, next, CV_BGR2GRAY);
goodFeaturesToTrack( prev,
corners,
maxCorners,
qualityLevel,
minDistance,
cv::Mat(),
blockSize,
useHarrisDetector,
k );
cornerSubPix(prev,
corners,
cvSize( 10, 10 ) ,
cvSize( -1, -1 ),
cvTermCriteria( CV_TERMCRIT_ITER | CV_TERMCRIT_EPS, 20, 0.03 ) );
std::vector<uchar> features_found;
features_found.reserve(maxCorners);
std::vector<float> feature_errors;
feature_errors.reserve(maxCorners);
calcOpticalFlowPyrLK(prev, next, corners, corners_b, features_found,
feature_errors, cvSize( 10, 10 ), 5, cvTermCriteria( CV_TERMCRIT_ITER | CV_TERMCRIT_EPS, 20, 0.3 ), 0);
IplImage g = next;
for( int i = 0; i < maxCorners; ++i )
{
CvPoint p0 = cvPoint( cvRound( corners[i].x ), cvRound( corners[i].y ) );
CvPoint p1 = cvPoint( cvRound( corners_b[i].x ), cvRound( corners_b[i].y ) );
cvLine( &g, p0, p1, CV_RGB(255,0,0), 3, CV_AA );
}
cv::Mat rs(&g);
imshow( "result window", rs );
int key = cv::waitKey(5);
}
int main(int argc, char* argv[])
{
cv::VideoCapture cap(0);
if(!cap.isOpened())
{
std::cout<<"[!] Error: cant open camera!"<<std::endl;
return -1;
}
cv::Mat edges;
cv::namedWindow("result window", 1);
cv::Mat frame, frame2;
cap >> frame;
while(1)
{
cap >> frame2;
MotionDetection(frame, frame2);
}
return 0;
}