Using ROI from camera feed as Template for cvMatchTemplate - c

Question

This is code that im rewriting that i wrote successfully before.
its suppose to use a a roi from a webcam and match it with cvMatchTemplate against other webcam frames...I took out the trackbars and windows to keep it short per guidelines but in the original you could move the trackbars to select a section of the frame in the top left window and in the bottom left window you saw your template
here is a picture of what it looked like:
http://i983.photobucket.com/albums/ae313/edmoney777/Screenshotfrom2013-10-21112021_zpsae11e3f0.png
Here is the error im getting
I tried changing the depth of src to 32F with no luck...read the templmatch.cpp
line 384 the error mssg gave me but no help there
OpenCV Error: Assertion failed (result.size() == cv::Size(std::abs
(img.cols - templ.cols) + 1, std::abs(img.rows - templ.rows) + 1)
&& result.type() == CV_32F) in cvMatchTemplat
Im new to opencv and could use a little help debugging the code below
#include <cv.h>
#include <highgui.h>
using namespace std;
int main(){
CvCapture* capture =0;
capture = cvCaptureFromCAM(0);
if(!capture){
printf("Capture failure\n");
return -1;
}
IplImage* frame=0;
double width=640.0;
double height=480.0;
cvSetCaptureProperty(capture, CV_CAP_PROP_FRAME_WIDTH, width);
cvSetCaptureProperty(capture, CV_CAP_PROP_FRAME_HEIGHT, height);
while(true){
frame = cvQueryFrame(capture);
if(!frame) break;
frame=cvCloneImage(frame);
IplImage *src, *templ, *ftmp[6]; // ftmp will hold results
int i;
CvRect roi;
int rectx = 0;
int recty = 0;
int rectwidth = frame->width /10;
int rectheight = frame->height /10;
IplImage* img = cvCreateImage(cvGetSize(frame), IPL_DEPTH_8U, 3);
// Read in the source image to be searched
src = cvCreateImage(cvGetSize(frame), IPL_DEPTH_8U, 3);
roi=cvRect(rectx, recty, rectwidth, rectheight);
img = cvCreateImage(cvGetSize(frame), IPL_DEPTH_8U, 3);
src = cvCreateImage(cvGetSize(frame), IPL_DEPTH_8U, 3);
cvCopy(frame, img);
cvSetImageROI(frame, roi);
cvShowImage( "b", img );
cvReleaseImage(&img);
// Allocate Output Images:
int iwidth = src->width - frame->width + 1;
int iheight = src->height - frame->height + 1;
for(i = 0; i < 6; ++i){
ftmp[i]= cvCreateImage( cvSize( iwidth, iheight ), 32, 1 );
}
// Do the matching of the template with the image
for( i = 0; i < 6; ++i ){
cvMatchTemplate( src, frame, ftmp[i], i );
cvNormalize( ftmp[i], ftmp[i], 1, 0, CV_MINMAX );
}
// DISPLAY
cvReleaseImage(&src);
cvResetImageROI(frame);
cvReleaseImage(&frame);
//Wait 50mS
int c = cvWaitKey(10);
//If 'ESC' is pressed, break the loop
if((char)c==27 ) break;
}
cvDestroyAllWindows() ;
cvReleaseCapture(&capture);
return 0;
}
I am new to OpenCV and really don't know what to do with this error-message. Anyone an idea/pointer what to do? Your help is very appreciated! Cheers,

Answer 1

As you are performing template matching on the selected ROI of the image, you have to create the output images according to the size of ROI.
// Allocate Output Images:
int iwidth = src->width - rectwidth + 1;
int iheight = src->height - rectheight + 1;
Your code contains memory leaks which may crash the program e.g. all 6 images of ftmp are being allocated in each iteration but not being released anywhere. Either release the images at the end of iteration, or create them only once before while loop.
Also, OpenCV documentation explicitly states not to modify the frame returned by cvQueryFrame. So you may consider removing cvReleaseImage(&frame);. Check this answer for details.