Template Matching using OpenCV internal function

For this example we need to add the following to the linker dependencies:
opencv_core220d.lib
opencv_highgui220d.lib
opencv_imgproc220d.lib

Code:

#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include <string.h>

#include<opencv2\opencv.hpp>
#include <opencv2\highgui\highgui.hpp>

int main(int argc, char *argv[])
{
IplImage *img;
IplImage *tpl;
IplImage *res;
CvPoint minloc, maxloc;
double minval, maxval;
int img_width, img_height;
int tpl_width, tpl_height;
int res_width, res_height;

/* check for arguments */
if( argc < 3 ) {
printf( "Usage: template_match <reference> <template>\n" );
return 1;
}

/* load reference image */
img = cvLoadImage( argv[1], CV_LOAD_IMAGE_COLOR );
/* always check */

if( img == 0 ) {
printf( "Cannot load file %s!\n", argv[1] );
return 1;
}

/* load template image */
tpl = cvLoadImage( argv[2], CV_LOAD_IMAGE_COLOR );

/* always check */
if( tpl == 0 ) {
printf("Cannot load file %s!\n", argv[2] );
return 1;
}

/* get image's properties */
img_width = img->width;
img_height = img->height;
tpl_width = tpl->width;
tpl_height = tpl->height;
res_width = img_width - tpl_width + 1;
res_height = img_height - tpl_height + 1;

/* create new image for template matching computation */
res = cvCreateImage( cvSize( res_width, res_height ), IPL_DEPTH_32F, 1 );

/* choose template matching method to be used */
cvMatchTemplate( img, tpl, res, CV_TM_SQDIFF );
/*cvMatchTemplate( img, tpl, res, CV_TM_SQDIFF_NORMED );
cvMatchTemplate( img, tpl, res, CV_TM_CCORR );
cvMatchTemplate( img, tpl, res, CV_TM_CCORR_NORMED );
cvMatchTemplate( img, tpl, res, CV_TM_CCOEFF );
cvMatchTemplate( img, tpl, res, CV_TM_CCOEFF_NORMED );*/

cvMinMaxLoc( res, &minval, &maxval, &minloc, &maxloc, 0 );
/* draw red rectangle */
cvRectangle( img,
cvPoint( minloc.x, minloc.y ),
cvPoint( minloc.x + tpl_width, minloc.y + tpl_height ),
cvScalar( 0, 0, 255, 0 ), 1, 0, 0 );
/* display images */
cvNamedWindow( "reference", CV_WINDOW_AUTOSIZE );
cvNamedWindow( "template", CV_WINDOW_AUTOSIZE );
cvShowImage( "reference", img );
cvShowImage( "template", tpl );

/* wait until user press a key to exit */
cvWaitKey( 0 );

/* free memory */
cvDestroyWindow( "reference" );
cvDestroyWindow( "template" );
cvReleaseImage( &img );
cvReleaseImage( &tpl );
cvReleaseImage( &res );

return 0;
}