作者：gnuhpc
出处：http://www.cnblogs.com/gnuhpc/
#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 );
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;
}