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