| OpenCV 5.0.0alpha Open Source Computer Vision

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samples/cpp/snippets/phase_corr.cpp

An example using the phaseCorrelate function

#include "opencv2/core.hpp"
#include "opencv2/videoio.hpp"
#include "opencv2/highgui.hpp"
#include "opencv2/imgproc.hpp"
using namespace cv;
int main(int, char* [])
{
VideoCapture video(0);
Mat frame, curr, prev, curr64f, prev64f, hann;
char key;
do
{
video >> frame;
cvtColor(frame, curr, COLOR_RGB2GRAY);
if(prev.empty())
{
prev = curr.clone();
createHanningWindow(hann, curr.size(), CV_64F);
}
prev.convertTo(prev64f, CV_64F);
curr.convertTo(curr64f, CV_64F);
Point2d shift = phaseCorrelate(prev64f, curr64f, hann);
double radius = std::sqrt(shift.x*shift.x + shift.y*shift.y);
if(radius > 5)
{
// draw a circle and line indicating the shift direction...
Point center(curr.cols >> 1, curr.rows >> 1);
circle(frame, center, (int)radius, Scalar(0, 255, 0), 3, LINE_AA);
line(frame, center, Point(center.x + (int)shift.x, center.y + (int)shift.y), Scalar(0, 255, 0), 3, LINE_AA);
}
imshow("phase shift", frame);
key = (char)waitKey(2);
prev = curr.clone();
} while(key != 27); // Esc to exit...
return 0;
}
cv::Mat
n-dimensional dense array class
Definition mat.hpp:951
cv::Mat::clone
CV_NODISCARD_STD Mat clone() const
Creates a full copy of the array and the underlying data.
cv::Mat::size
MatSize size
Definition mat.hpp:2448
cv::Mat::cols
int cols
Definition mat.hpp:2425
cv::Mat::empty
bool empty() const
Returns true if the array has no elements.
cv::Mat::rows
int rows
the number of rows and columns or (-1, -1) when the matrix has more than 2 dimensions
Definition mat.hpp:2425
cv::Mat::convertTo
void convertTo(OutputArray m, int rtype, double alpha=1, double beta=0) const
Converts an array to another data type with optional scaling.
cv::Point_< double >
cv::Point_::y
_Tp y
y coordinate of the point
Definition types.hpp:202
cv::Point_::x
_Tp x
x coordinate of the point
Definition types.hpp:201
cv::Scalar_< double >
cv::VideoCapture
Class for video capturing from video files, image sequences or cameras.
Definition videoio.hpp:727
CV_64F
#define CV_64F
Definition interface.h:82
highgui.hpp
main
int main(int argc, char *argv[])
Definition highgui_qt.cpp:3
core.hpp
imgproc.hpp
cv
Definition core.hpp:107
videoio.hpp