我有两个字符“U”的图像。我使用 cvMatchTemplate 函数比较了它们的相似性。然后，我使用 cvMinMaxLoc 函数来查找像素的最大值和最小值以及它们各自的位置。但是当我比较它们时，它会返回一个带有字符“Q”的最大值，并且最大值和最小值是相同的。我不明白这里有什么问题？？？图像大小相同。我的代码是：
#include "cv.h"
#include "cxcore.h"
#include "highgui.h"
#include <iostream>
#include <stdio.h>
using namespace std;
using namespace cv;
int main()
{
char text[]={'Q','U'};
IplImage * tmp[2];
tmp[0]=cvLoadImage("D:\\Standards\\u.bmp",1);
tmp[1]=cvLoadImage("D:\\Standards\\q.bmp",1);
IplImage* src;
IplImage* dst;
IplImage* gray;
IplImage* grayThresh;
IplImage* gray1[1];
IplImage* grayThresh1[1];
int threshold = 120, maxValue = 255;
int thresholdType = CV_THRESH_BINARY;
src = cvLoadImage("D:\\OU.bmp", 1);
gray = cvCreateImage( cvSize(src->width,src->height), IPL_DEPTH_8U, 1 );
cvCvtColor(src, gray, CV_BGR2GRAY );
grayThresh = cvCloneImage( gray );
cvThreshold(gray, grayThresh, threshold, maxValue, thresholdType);
for(int i=0;i<=1;i++){
gray1[i] = cvCreateImage( cvSize(tmp[i]->width,tmp[i]->height), IPL_DEPTH_8U, 1 );
cvCvtColor(tmp[i], gray1[i], CV_BGR2GRAY );
grayThresh1[i] = cvCloneImage( gray1[i] );
cvThreshold(gray1[i], grayThresh1[i], threshold, maxValue, thresholdType);
}
CvPoint minloc, maxloc;
double minval, maxval;
int iwidth = grayThresh1[0]->width - grayThresh->width + 1;
int iheight =grayThresh1[0]->height - grayThresh->height + 1;
IplImage *res=cvCreateImage( cvSize(iwidth,iheight),32,1);
for(int i=0;i<=1;i++){
cvMatchTemplate(grayThresh,grayThresh1[i],res,CV_TM_CCORR_NORMED);
cvMinMaxLoc( res, &minval, &maxval, &minloc, &maxloc, 0 );
cout<<text[i]<<" maxval="<<maxval<<" minval="<<minval<<endl;}
cvDestroyWindow( "grayThresh" );
cvDestroyWindow( "src" );
cvDestroyWindow( "dst" );
cvDestroyWindow( "grayThresh1" );
cvReleaseImage( &src );
cvReleaseImage( &grayThresh );
cvReleaseImage( &dst );
for(int i=0;i<=1;i++)
cvReleaseImage( &grayThresh1[i] );
return 0;
}