矩阵和图像操作

(1)cvGEMM函数

其结构

double cvGEMM(//矩阵的广义乘法运算const CvArr* src1,//乘数矩阵const CvArr* src2,//乘数矩阵double alpha,//1号矩阵系数const CvArr* src3,//加权矩阵double beta,//2号矩阵系数CvArr* dst,//结果矩阵int tABC = 0//变换标记
);

tABC变换标记及其相应的含义

函数相应的乘法运算公式为：dst = (alpha*src1)xsrc2+(beta*src3)

实例代码

#include <cv.h>
#include <highgui.h>
#include <stdio.h>
#include <iostream>
using namespace std;int main()
{ double a[3][3] = {    {1,0,0},{0,2,0},{0,0,3}};CvMat va=cvMat(3,3, CV_64FC1,a);cout<<"目标矩阵1："<<endl;for(int i=0;i<3;i++){for(int j=0;j<3;j++)printf("%f\t",cvmGet(&va,i,j));cout << endl;}double b[3][3] = {    {1,1,1},{1,1,1},{1,1,1}};CvMat vb =cvMat(3, 3, CV_64FC1, b);cout<<"目标矩阵2："<<endl;for(int i=0;i<3;i++){for(int j=0;j<3;j++)printf("%f\t",cvmGet(&vb,i,j));cout << endl;}double c[3][3] = {0,0,0,0,0,0,0,0,0};CvMat vc = cvMat(3,3, CV_64FC1, c); cvGEMM(&va,&vb,1,&vc,1,&vc);cout << "结果矩阵："<< endl;for(int i=0;i<3;i++){for(int j=0;j<3;j++)printf("%f\t",cvmGet(&vc,i,j));cout << endl;}getchar();return 0;
}

输出结果

(2)cvGetCol函数

其结构

CvMat* cvGetCol(//取出矩阵中的一列const CvArr* arr,//目标矩阵CvMat* submat,//矩阵指针int col//所要取的列的索引数
);

实例代码

#include <cv.h>
#include <highgui.h>
#include <stdio.h>
#include <iostream>
using namespace std;int main()
{ double a[3][3] = {    {1,0,0},{0,2,0},{0,0,3}};CvMat va=cvMat(3,3, CV_64FC1,a);cout<<"目标矩阵："<<endl;for(int i=0;i<3;i++){for(int j=0;j<3;j++)printf("%f\t",cvmGet(&va,i,j));cout << endl;}CvMat vb =cvMat(3,3, CV_64FC1);CvMat vc =cvMat(3,1, CV_64FC1); vc = *(cvGetCol(&va,&vb,1));cout << "所要取的列为："<< endl;for(int i=0;i<3;i++){printf("%f\t",cvmGet(&vc,i,0));cout << endl;}getchar();return 0;
}

输出结果

(3)cvGetCols函数

其结构

CvMat* cvGetCols(//取出矩阵中的一些列const CvArr* arr,//目标矩阵CvMat* submat,//矩阵指针int start_col,//開始列。包括int end_col//结束列。不包括
);

实例代码

#include <cv.h>
#include <highgui.h>
#include <stdio.h>
#include <iostream>
using namespace std;int main()
{ double a[5][5] = {    {1,0,0,0,0},{0,2,0,0,0},{0,0,3,0,0},{0,0,0,4,0},{0,0,0,0,5}};CvMat va=cvMat(5,5, CV_64FC1,a);cout<<"目标矩阵："<<endl;for(int i=0;i<5;i++){for(int j=0;j<5;j++)printf("%f\t",cvmGet(&va,i,j));cout << endl;}CvMat vb =cvMat(5,5, CV_64FC1);CvMat vc =cvMat(5,5, CV_64FC1); vc = *(cvGetCols(&va,&vb,0,3));cout << "所要取的列为："<< endl;for(int i=0;i<vc.rows;i++){for(int j=0;j<vc.cols;j++)printf("%f\t",cvmGet(&vc,i,j));cout << endl;}getchar();return 0;
}

输出结果

(4)cvGetDiag函数

其结构

CvMat* cvGetDiag(//取出矩阵的特定对角线const CvArr* arr,//目标矩阵CvMat* submat,//矩阵指针int diag = 0//控制标量，0为主对角，1或-1为0相邻对角。以此类推。

);

实例代码

#include <cv.h>
#include <highgui.h>
#include <stdio.h>
#include <iostream>
using namespace std;int main()
{ double a[5][5] = {    {1,0,0,0,6},{0,2,0,7,0},{0,0,3,0,0},{0,9,0,4,0},{8,0,0,0,5}};CvMat va=cvMat(5,5, CV_64FC1,a);cout<<"目标矩阵："<<endl;for(int i=0;i<5;i++){for(int j=0;j<5;j++)printf("%f\t",cvmGet(&va,i,j));cout << endl;}CvMat vb =cvMat(5,5, CV_64FC1);CvMat vc =cvMat(5,5, CV_64FC1); vc = *(cvGetDiag(&va,&vb,0));cout << "所要取的对角线为："<< endl;for(int i=0;i<vc.rows;i++){for(int j=0;j<vc.cols;j++)printf("%f\t",cvmGet(&vc,i,j));cout << endl;}getchar();return 0;
}

输出结果

to be continued