opencv-Mat补充

opencv2.4.3所给代码如下：

/*  For description look into the help() function. */#include "opencv2/core/core.hpp"#include <iostream>//#include <opencv2/core/core.hpp>//#include <opencv2/highgui/highgui.hpp>//#include <cv.h>//#include <iostream>using namespace std;using namespace cv;void help(){    cout    << "\n--------------------------------------------------------------------------" << endl    << "This program shows how to create matrices(cv::Mat) in OpenCV and its serial"    << " out capabilities"                                                            << endl    << "That is, cv::Mat M(...); M.create and cout << M. "                            << endl    << "Shows how output can be formated to OpenCV, python, numpy, csv and C styles." << endl    << "Usage:"                                                                       << endl    << "./cvout_sample"                                                               << endl    << "--------------------------------------------------------------------------"   << endl    << endl;}int main(int,char**){    help();    // create by using the constructor    Mat M(2,2, CV_8UC3, Scalar(0,0,255));    cout << "M = " << endl << " " << M << endl << endl;    // create by using the create function()    M.create(4,4, CV_8UC(2));    cout << "M = "<< endl << " "  << M << endl << endl;    // create multidimensional matrices    int sz[3] = {2,2,2};    Mat L(3,sz, CV_8UC(1), Scalar::all(0));    // Cannot print via operator <<    // Create using MATLAB style eye, ones or zero matrix    Mat E = Mat::eye(4, 4, CV_64F);    cout << "E = " << endl << " " << E << endl << endl;    Mat O = Mat::ones(2, 2, CV_32F);    cout << "O = " << endl << " " << O << endl << endl;    Mat Z = Mat::zeros(3,3, CV_8UC1);    cout << "Z = " << endl << " " << Z << endl << endl;    // create a 3x3 double-precision identity matrix    Mat C = (Mat_<double>(3,3) << 0, -1, 0, -1, 5, -1, 0, -1, 0);    cout << "C = " << endl << " " << C << endl << endl;    Mat RowClone = C.row(1).clone();    cout << "RowClone = " << endl << " " << RowClone << endl << endl;    // Fill a matrix with random values    Mat R = Mat(3, 2, CV_8UC3);    randu(R, Scalar::all(0), Scalar::all(255));    // Demonstrate the output formating options    cout << "R (default) = " << endl <<        R           << endl << endl;    cout << "R (python)  = " << endl << format(R,"python") << endl << endl;    cout << "R (numpy)   = " << endl << format(R,"numpy" ) << endl << endl;    cout << "R (csv)     = " << endl << format(R,"csv"   ) << endl << endl;    cout << "R (c)       = " << endl << format(R,"C"     ) << endl << endl;    Point2f P(5, 1);    cout << "Point (2D) = " << P << endl << endl;    Point3f P3f(2, 6, 7);    cout << "Point (3D) = " << P3f << endl << endl;    vector<float> v;    v.push_back( (float)CV_PI);   v.push_back(2);    v.push_back(3.01f);    cout << "Vector of floats via Mat = " << Mat(v) << endl << endl;    vector<Point2f> vPoints(20);    for (size_t E = 0; E < vPoints.size(); ++E)        vPoints[E] = Point2f((float)(E * 5), (float)(E % 7));    cout << "A vector of 2D Points = " << vPoints << endl << endl;    return 0;}