opencv CvMat矩阵结构

用于新建一个二维矩阵的例程：

cvMat* cvCreateMat(int rows, int cols, int type);

type预定义类型：CV_<bit_depth>(S|U|F)C<number_of_channels> 例：32位浮点型数据(CV_32FC1)、无符号的8位三元组的整型数据(CV_8UC3)

矩阵的创建和释放

//Create a new rows by cols matrix of type 'type'

//

CvMat* cvCreateMat(int rows, int cols, int type);

//Create only matrix header without allocating data

//

CvMat* cvCreateMatHeader(int rows, int cols, int type);

//Initialize header on existing CvMat structure

//

CvMat* cvInitMatHeader(CvMat* mat, int rows, int cols, int type, void* data=NULL, int step=CV_AUTOSTEP);

//Like cvInitMatHeader() but allocate CvMat as well

//

CvMat cvMat(int rows, int cols, int type, vodi* data=NULL);

//Allocate a new matrix just like the matrix 'mat'

//

CvMat* cvCloneMat(const cvMat* mat);

//Free the matrix 'mat', both header and data

//

void cvReleaseMat(CVMat **mat);

用固定函数创建一个OpenCV矩阵

#include <cv.h>

#include <highgui.h>

void createMat(void)
{
//Create an opencv matrix containing some fixed data
//
float vals[] = {0.866025, -0.500000, 0.500000, 0.866025};

CvMat rotmat;

cvInitMatHeader(&rotmat, 2, 2, CV_32FC1, vals);

for (int i=0; i<rotmat.width; i++)
{
for (int j=0; j<rotmat.height; j++)
{
CvScalar scalar=cvGet2D(&rotmat, j, i);
cout<<scalar.val[0]<<" ";
}
cout<<endl;
}
}