DRAFT: This module has unpublished changes.

/*


 * TemplateMatching 1.0
 *
 * @author       Nashruddin Amin <me@nashruddin.com>
 * @version   1.0
 * @website      www.nashruddin.com
 */
 
#include <stdio.h>
#include "cv.h"
#include "highgui.h"
 
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 ) {
        fprintf( stderr, "Usage: template_match <reference> <template>\n" );
        return 1;
    }
 
    /* load reference image */
    img = cvLoadImage( argv[1], CV_LOAD_IMAGE_COLOR );
 
    /* always check */
    if( img == 0 ) {
        fprintf( stderr, "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 ) {
        fprintf( stderr, "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;
}

DRAFT: This module has unpublished changes.