clone()和copyTo()的区别

the implementation of clone() function:

inline Mat Mat::clone() const{    Mat m;    copyTo(m);    return m;}

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clone()和copyTo()最大的区别在于clone()会给目标矩阵分配新地址，而copyTo()不会。
举个例子，

Mat img1 = ones(1, 5, CV_32F);Mat img2 = img1;Mat img3 = zeros(1, 5, CV_32F);img3.copyTo(img1);cout << img1 << endl;cout << img2 << endl;

output:
[0, 0, 0, 0, 0]
[0, 0, 0, 0, 0]

Mat img1 = ones(1, 5, CV_32F);Mat img2 = img1;Mat img3 = zeros(1, 5, CV_32F);img1 = img3.clone();cout << img1 << endl;cout << img2 << endl;

output:
[0, 0, 0, 0, 0]
[1, 1, 1, 1, 1]

例2中可见clone()替img1申请了一块新内存，而img2仍指向原来的img1的地址，所以img2不变