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 | 1 | initial version |
You have to use a mouse callback function. There is an example in grabcut sample.
You can try this :
#include <opencv2/opencv.hpp>
using namespace cv;
using namespace std;
struct ParamRect {
int rctEnCours;
Rect r;
Mat img;
Mat result;
int nbIteration;
String nomFenetre;
};
void DefRectangle(int event, int x, int y, int flags, void *userData)
{
ParamRect *pgc = (ParamRect*)userData;
if ((flags&EVENT_FLAG_LBUTTON)!=0 && (flags & EVENT_FLAG_CTRLKEY)==0)
{
if (pgc->rctEnCours == 0)
{
pgc->r.x = x;
pgc->r.y = y;
pgc->r.width = 0;
pgc->r.height = 0;
pgc->rctEnCours = 1;
}
else if (pgc->rctEnCours == 1)
{
Point tl = pgc->r.tl(), br = pgc->r.br();
if (x != pgc->r.x)
{
if (x < pgc->r.x)
{
pgc->r.x = x;
pgc->r.width = br.x - x - 1;
}
else
pgc->r.width = x - tl.x - 1;
}
if (y != pgc->r.y)
{
if (y < pgc->r.y)
{
pgc->r.y = y;
pgc->r.height = br.y - y - 1;
}
else
pgc->r.height = y - tl.y - 1;
}
if (pgc->r.br().x > pgc->img.size().width)
{
pgc->r.width = pgc->img.size().width - pgc->r.x;
}
if (pgc->r.br().y > pgc->img.size().height)
{
pgc->r.height = pgc->img.size().height - pgc->r.y;
}
}
}
else if (event == EVENT_LBUTTONUP && pgc->rctEnCours == 1)
{
pgc->rctEnCours = 0;
}
if ((flags&EVENT_FLAG_LBUTTON) != 0 && (flags & EVENT_FLAG_CTRLKEY) != 0)
{
pgc->r.x = x;
pgc->r.y = y;
}
Mat img = pgc->img.clone();
rectangle(img, pgc->r, Scalar(0, 255, 0), 2);
imshow(pgc->nomFenetre, img - 0.5* pgc->result);
waitKey(10);
}
const String keys =
"{Aide h usage ? help | | Afficher ce message }"
"{@arg1 | | chemin complet de l'image couleur (3 canaux)}";
int main(int argc, char* argv[])
{
CommandLineParser parser(argc, argv, keys);
if (parser.has("help"))
{
parser.printMessage();
return 0;
}
String nomFic = parser.get<String>(0);
if (nomFic.length() == 0)
{
parser.printMessage();
return 0;
}
ParamRect pgc;
pgc.rctEnCours = 0;
pgc.img = imread(nomFic, IMREAD_COLOR);
if (pgc.img.empty())
{
cout << "File empty. Check name file.\n";
return 0;
}
pgc.nomFenetre = "MyImage";
imshow(pgc.nomFenetre, pgc.img);
setMouseCallback(pgc.nomFenetre, DefRectangle, &pgc);
int code = 0;
do
{
code = waitKey(30);
} while (code != 27);
}
use left button to define a rect and ctrl key and left button to move it. I didn't check if rect is outside of image
| | 2 | No.2 Revision |
You have to use a mouse callback function. There is an example in grabcut sample.
You can try this :
#include <opencv2/opencv.hpp>
using namespace cv;
using namespace std;
struct ParamRect {
int rctEnCours;
Rect r;
Mat img;
Mat result;
int nbIteration;
String nomFenetre;
};
void DefRectangle(int event, int x, int y, int flags, void *userData)
{
ParamRect *pgc = (ParamRect*)userData;
if (pgc->img.empty())
return;
/* UNUSED
if ((flags&EVENT_FLAG_LBUTTON)!=0 && (flags & EVENT_FLAG_CTRLKEY)==0)
{
if (pgc->rctEnCours == 0)
{
pgc->r.x = x;
pgc->r.y = y;
pgc->r.width = 0;
pgc->r.height = 0;
pgc->rctEnCours = 1;
}
else if (pgc->rctEnCours == 1)
{
Point tl = pgc->r.tl(), br = pgc->r.br();
if (x != pgc->r.x)
{
if (x < pgc->r.x)
{
pgc->r.x = x;
pgc->r.width = br.x - x - 1;
}
else
pgc->r.width = x - tl.x - 1;
}
if (y != pgc->r.y)
{
if (y < pgc->r.y)
{
pgc->r.y = y;
pgc->r.height = br.y - y - 1;
}
else
pgc->r.height = y - tl.y - 1;
}
if (pgc->r.br().x > pgc->img.size().width)
{
pgc->r.width = pgc->img.size().width - pgc->r.x;
}
if (pgc->r.br().y > pgc->img.size().height)
{
pgc->r.height = pgc->img.size().height - pgc->r.y;
}
}
}
else */
if (event == EVENT_LBUTTONUP && pgc->rctEnCours == 1)
{
pgc->rctEnCours = 0;
}
if ((flags&EVENT_FLAG_LBUTTON) != 0 && (flags & EVENT_FLAG_CTRLKEY) != 0)
{
pgc->r.x = x;
pgc->r.y = y;
}
Mat img = pgc->img.clone();
rectangle(img, pgc->r, Scalar(0, 255, 0), 2);
imshow(pgc->nomFenetre, img - 0.5* pgc->result);
);
waitKey(10);
}
const String keys =
"{Aide h usage ? help | | Afficher ce message }"
"{@arg1 | | chemin complet de l'image couleur (3 canaux)}";
#include <iostream>
#include <opencv2/core/core.hpp>
#include <opencv2/imgproc/imgproc.hpp>
#include <opencv2/highgui/highgui.hpp>
using namespace cv;
using namespace std;
int main(int argc, char* argv[])
{
CommandLineParser parser(argc, argv, keys);
if (parser.has("help"))
{
parser.printMessage();
main()
{
// Open the video file
VideoCapture capture("g:/lib/opencv/samples/data/Megamind.avi");
if (!capture.isOpened())
return 0;
}
String nomFic = parser.get<String>(0);
if (nomFic.length() == 0)
{
parser.printMessage();
return 0;
}
1;
bool stop(false);
ParamRect pgc;
pgc.rctEnCours = 0;
pgc.img = imread(nomFic, IMREAD_COLOR);
if (pgc.img.empty())
{
cout << "File empty. Check name file.\n";
return 0;
}
Mat frame; //current video frame
pgc.img=frame;
pgc.nomFenetre = "MyImage";
imshow(pgc.nomFenetre, pgc.img);
"Extracted Frame";
namedWindow(pgc.nomFenetre);
int delay = 10;
setMouseCallback(pgc.nomFenetre, DefRectangle, &pgc);
int code = 0;
do
{
code = waitKey(30);
}
cout << capture.get(CV_CAP_PROP_FPS);
// capture.set(CV_CAP_PROP_POS_AVI_RATIO, 0.5); not a good idea
pgc.r= Rect(200, 150, 40, 40);
while (code != 27);
(!stop)
{
capture>>pgc.img;
if (waitKey(delay) >= 0 || pgc.img.empty())
stop = true;
}
waitKey();
}
use left button to define a rect and ctrl key and left button to move it.
rectangle .
I didn't check if rect is outside of image