cvCompareHist() 直方图匹配

来源：互联网发布：淘宝网实时销售额编辑：程序博客网时间：2024/06/05 15:11

比较两个直方图的相似程度

函数原型和使用方法都很简单

/* Compares two histogram */
CVAPI(double) cvCompareHist( const CvHistogram* hist1,
const CvHistogram* hist2,
int method);

method是指4种不同的匹配方法

测试用图（两组，一组是找茬图，一组是镜像图）：

程序代码：

#include <highgui.h>#include<cv.h> #include <opencv2/legacy/legacy.hpp>using namespace std;int main(){IplImage *img1 = cvLoadImage("test3.jpg");IplImage *img2 = cvLoadImage("test4.jpg");IplImage *img_gray1 = cvCreateImage(cvGetSize(img1),IPL_DEPTH_8U,1);IplImage *img_gray2 = cvCreateImage(cvGetSize(img2),IPL_DEPTH_8U,1);cvNamedWindow("img1",CV_WINDOW_AUTOSIZE);cvShowImage("img1",img1);cvNamedWindow("img2",CV_WINDOW_AUTOSIZE);cvShowImage("img2",img2);cvCvtColor(img1,img_gray1,CV_BGR2GRAY);cvNamedWindow("img_gray1",CV_WINDOW_AUTOSIZE);cvShowImage("img_gray1",img_gray1);cvCvtColor(img2,img_gray2,CV_BGR2GRAY);cvNamedWindow("img_gray2",CV_WINDOW_AUTOSIZE);cvShowImage("img_gray2",img_gray2);int hist_size=256;//直方图的横轴长度  int hist_height=256;//直方图的纵轴高度 float range[]={0,255}; //灰度级的范围float* ranges[]={range};CvHistogram *Histogram1 = cvCreateHist(1,&hist_size,CV_HIST_ARRAY,ranges,1);CvHistogram *Histogram2 = cvCreateHist(1,&hist_size,CV_HIST_ARRAY,ranges,1);cvCalcHist(&img_gray1,Histogram1,0,0);//计算直方图cvNormalizeHist(Histogram1,1.0);//归一化直方图cvCalcHist(&img_gray2,Histogram2,0,0);//计算直方图cvNormalizeHist(Histogram2,1.0);//归一化直方图printf("CV_COMP_CORREL : %.4f\n",cvCompareHist(Histogram1,Histogram2,CV_COMP_CORREL));printf("CV_COMP_CHISQR : %.4f\n",cvCompareHist(Histogram1,Histogram2,CV_COMP_CHISQR));printf("CV_COMP_INTERSECT : %.4f\n",cvCompareHist(Histogram1,Histogram2,CV_COMP_INTERSECT));printf("CV_COMP_BHATTACHARYYA : %.4f\n",cvCompareHist(Histogram1,Histogram2,CV_COMP_BHATTACHARYYA));cvWaitKey(0);cvDestroyAllWindows();cvReleaseImage(&img1);cvReleaseImage(&img2);return 0;}

运行结果：

0 0