Template matching on camera capture [closed]
Hi I am new to opencv and was trying to see if I can match a template with a frame from a camera capture. The trouble is my template images seems to change even when I do not press 's'. How do I fix this?
#include "opencv2/highgui/highgui.hpp"
#include "opencv2/imgproc/imgproc.hpp"
#include <iostream>
#include <cv.h>
using namespace std;
using namespace cv;
#define TPL_WIDTH 40 /* template width */
#define TPL_HEIGHT 40 /* template height */
bool template_selected=FALSE;
int ROIx,ROIy;
Mat frame,templateimage,templatematch;
static void onMouse( int event, int x, int y, int, void* );
int main ( int argc, char **argv )
{
int c=0;
Point minloc, maxloc;
double minval, maxval;
VideoCapture cap(0); // open the default camera
if(!cap.isOpened()) return -1; // Check if camera opened
namedWindow( "FrameWin", CV_WINDOW_AUTOSIZE);
namedWindow( "template", CV_WINDOW_AUTOSIZE);
setMouseCallback("FrameWin",onMouse,0);
// Open the template image
templateimage = imread("./template.jpg");
if(!templateimage.empty()) {
printf ( "Read template image: Rows = %i \t Cols = %i \n",templateimage.rows,templateimage.cols);
template_selected=TRUE;
} else { printf ( "No template image found. Left click to define template\n"); }
while (c != 'q') {
cap >> frame;
if (template_selected) {
matchTemplate(frame,templateimage,templatematch, CV_TM_SQDIFF_NORMED );
normalize(templatematch,templatematch , 0, 1, NORM_MINMAX, -1, Mat() );
minMaxLoc(templatematch,&minval, &maxval, &minloc, &maxloc, Mat() );
rectangle(frame,minloc,Point( minloc.x + TPL_WIDTH , minloc.y + TPL_HEIGHT ), Scalar::all(0), 2, 8, 0 );
}
imshow("FrameWin",frame);
imshow("template",templateimage);
c = cvWaitKey(100);
if (c=='s') {
imwrite("template.jpg", templateimage);
cout << "Left button of the mouse is clicked - position (" << ROIx << ", " << ROIy << ")" << endl;
cout << "Saved the template to template.jpg" << endl;
}
}
destroyWindow("FrameWin");
destroyWindow("template");
return 0;
}
static void onMouse( int event, int x, int y, int, void* ){
if ( event == EVENT_LBUTTONDOWN )
{
ROIx = x - ( TPL_WIDTH / 2 );
ROIy = y - ( TPL_HEIGHT / 2 );
// Copy the ROI to the template image
templateimage = frame(cvRect( ROIx,ROIy,TPL_WIDTH,TPL_HEIGHT ));
//frame.copyTo(templateimage(Rect( ROIx,ROIy,TPL_WIDTH,TPL_HEIGHT)));
template_selected=TRUE;
}
}
Many thanks. Even the example here : http://docs.opencv.org/doc/tutorials/imgproc/histograms/template_matching/template_matching.html
does not work. It compiles, and runs but the result window has the wrong regions highlighted. The closest if TM COEFF NORMED but even that is off.
I am running opencv-2.4.8
Hi, I am also working on the similar kind of scenario. I want to perform template matching by having source image input from webcam and match with a template image. I am new to OpenCV. Could you please help me in this.