opencv中的Mat詳解

1.初始化

mat-the basic image container 最最基本的函式，所有在opencv中都是用mat形式來操作的。

//初始化乙個mat

mat a,c;

a = imread(ar**[1],imread_color);
mat b(a); //複製a給b
c = a; //賦值運算
mat d(a,rect(10,10,100,100)); //使用乙個矩形
mat e = a(range::all(), range(1,3)); //使用行列邊界
mat f = a.clone();
mat g;
a.copyto(g);

mat m(2,2,cv_8uc3，scalar(0,0,255));

cout << "m = " << endl << " " << m << endl << endl;

在上面的cv_8uc3是什麼意思呢？

cv_[the number of bits per item][signed or unsigned][type prefix]c[the channel number]

scalar是什麼意思呢？

int sz[3] = ;

mat l(3,sz, cv_8uc(1), scalar::all(0));

m.create(4,4, cv_8uc(2));

cout << "m = "<< endl << " " << m << endl << endl;

mat e = mat::eye(4, 4, cv_64f);    //對角矩陣

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;

mat的輸出

cout << "r (default) = " << endl <<        r           << endl << endl;

cout << "r (python) = " << endl << format(r, formatter::fmt_python) << endl << endl;
cout << "r (csv) = " << endl << format(r, formatter::fmt_csv ) << endl << endl;
cout << "r (numpy) = " << endl << format(r, formatter::fmt_numpy ) << endl << endl;
cout << "r (c) = " << endl << format(r, formatter::fmt_c ) << endl << endl;

其他items的輸出

2d point:

point2f p(5, 1);

cout << "point (2d) = " << p << endl << endl;

point3f p3f(2, 6, 7);

cout << "point (3d) = " << p3f << endl << endl;

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