opencv3.0-Mat类笔记

转载自：http://blog.csdn.net/what_lei/article/details/54613575

Mat：

•         the matrix header   包含矩阵尺寸；
  
  
•         a pointer                  包含矩阵中的数值。

创建Mat：

• Mat M(2,2,CV_8UC3,Scalar(0,0,125));

       注：2,2表示矩阵尺寸；

CV_8UC3表示

CV_[The number of bits per itrm][signed or Unsigned][Type prefix]C[the channel number]；

Scalar(0,0,125)表示初始值。

• 使用create()函数

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1. M.create(4,4,CV_8UC(2));  

注：使用这种方法不能初始化矩阵。

创建特殊的Mat矩阵：

• 零矩阵--zeros()

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1. Mat zero=Mat::zeros(3,3,CV_8UC1);  

• 单位矩阵--eye()

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1. Mat I=Mat::eye(4,4,CV_64F);  

• 全1矩阵--ones()

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1. Mat one=Mat::ones(2,2,CV_32F);  

常见的其他输出项：

• 2D Point

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1. Point2f P(5, 1);  
2. cout << "Point (2D) = " << P << endl << endl;  

• 3D Point

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1. Point3f P3f(2, 6, 7);  
2. cout << "Point (3D) = " << P3f << endl << endl;  

• std::vector via cv::Mat

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1. vector<float> v;  
2. v.push_back( (float)CV_PI); v.push_back(2); v.push_back(3.01f);  
3. cout << "Vector of floats via Mat = " << Mat(v) << endl << endl;  

• std::vector of points

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1. vector<Point2f> vPoints(20);  
2. for (size_t i = 0; i < vPoints.size(); ++i)  
3.     vPoints[i] = Point2f((float)(i * 5), (float)(i % 7));  
4. cout << "A vector of 2D Points = " << vPoints << endl << endl;  

#include<iostream>
#include <opencv2\opencv.hpp>using namespace std;
using namespace cv;
using namespace cv::ml;int main()
{cout << "构造函数创建Mat:Mat M(2, 2, CV_8UC3, Scalar(0, 0, 125))" << endl;Mat M(2, 2, CV_8UC3, Scalar(0, 0, 125));  cout << M.rows << endl;cout << M.cols << endl;cout << M << endl;cout << "create函数创建Mat:Mat M1;M1.create(4, 4, CV_8UC(2)); " << endl;Mat M1;M1.create(4, 4, CV_8UC(2));cout << M1.rows << endl;cout << M1.cols << endl;cout << M1 << endl;cout << "Mat类静态函数zeros:Mat zero = Mat::zeros(3, 3, CV_8UC1);" << endl;cout << "创建零矩阵" << endl;Mat zero = Mat::zeros(3, 3, CV_8UC1);cout << zero << endl;cout << "单位矩阵:" << endl;Mat I = Mat::eye(4, 4, CV_64F);cout << I << endl;cout << "全1矩阵:" << endl;Mat one = Mat::ones(2, 2, CV_32F);cout << one << endl;Point2f p(5, 1);cout << "Point(2D) = " << p << endl;Point3f p3f(2, 6, 7);cout << "Point (3D) = " << p3f << endl;vector<float> v;v.push_back((float)CV_PI); v.push_back(2); v.push_back(3.01f);Mat t = Mat(v);  //t表示3行1列的矩阵cout << "Vector of floats via Mat = " << t << endl << endl;cout << t.rows << endl;  //3cout << t.cols << endl;  //1return 0;
}