向量乘积

//运行参数：girl.jpg 
#pragma comment(lib,"highgui.lib")
#pragma comment(lib,"cxcore.lib")
#pragma comment(lib,"cv.lib")
#pragma comment(lib,"ml.lib")
#pragma comment(lib,"cvaux.lib")
#pragma comment(lib,"cvcam.lib") 

#include "cv.h"
#include "highgui.h"
#include <stdio.h>

inline void cvDoubleMatPrint( const CvMat* mat );
int main( int argc,char** argv )
{
 IplImage* pImg; //声明IplImage指针

 if( argc == 2 && (pImg = cvLoadImage( argv[1],CV_LOAD_IMAGE_UNCHANGED)) != 0 )
 {
//*
	double va[] = {1,2,3};
	double vb[] = {0,1};
	double vc[3]; 
 
	CvMat Va=cvMat(3,1,CV_64FC1,va);
	CvMat Vb=cvMat(3,vb);
	CvMat Vc=cvMat(3,vc); 
 
	double res=cvDotProduct(&Va,&Vb); // 向量点乘:   Va . Vb -> res
	cvCrossproduct(&Va,&Vb,&Vc);    // 向量叉乘:   Va x Vb -> Vc
	//注意在进行叉乘运算时，Va,Vb,Vc 必须是仅有3个元素的向量.
//*/
 
  cvDoubleMatPrint(&Va);
  cvDoubleMatPrint(&Vb);
  cvDoubleMatPrint(&Vc);
  printf("res=%lf\n",res);

  cvNamedWindow( "Image",1 ); // 创建窗口
  cvShowImage( "Image",pImg ); // 显示图像
  cvWaitKey(0);     // 等待按键


  cvDestroyWindow( "Image" );  // 销毁窗口
  cvReleaseImage( &pImg );  // 释放图像

  return 0;
 }

 return -1;
}

inline void cvDoubleMatPrint( const CvMat* mat )
{
    int i,j;
    for( i = 0; i < mat->rows; i++ )
    {
        for( j = 0; j < mat->cols; j++ )
        {
            printf( "%lf ",cvmGet( mat,i,j ) );
        }
        printf( "\n" );
    }
}

原文地址：https://www.jb51.cc/vb/260058.html