opencv Mat类赋值函数copyTo、clone的区别

被赋值Mat之前已经被分配足够空间时，copyTo（）不重新给分配空间，继续使用之前的空间，当已分配空间不足时，则会重新分配空间；clone（）则均重新分配空间。

	Mat M(1, 3, CV_8UC1, Scalar(1));   
	cout << "M=" << endl << " " << M << endl << endl;

	Mat MM(1, 6, CV_8UC1, Scalar(2));
	cout << "MM=" << endl << " " << MM << endl << endl;

	Mat B = MM.colRange(0, 3);
	cout << "B=" << endl << " " << B << endl << endl;
 M.copyTo(B);//不重新给B分配空间，B与MM继续共享
 cout << "B=" << endl << " " << B << endl << endl;
 cout << "MM=" << endl << " " << MM << endl << endl;

	B = M.clone(); //重新给B分配空间
	cout << "B=" << endl << " " << B << endl << endl;
	cout << "MM=" << endl << " " << MM << endl << endl;

	Mat M(1, 3, CV_8UC1, Scalar(1));   
	cout << "M=" << endl << " " << M << endl << endl;

	Mat MM(3, 3, CV_8UC1, Scalar(2));
	cout << "MM=" << endl << " " << MM << endl << endl;

	Mat B = MM.colRange(0, 2);
	cout << "B=" << endl << " " << B << endl << endl;

	M.copyTo(B);//大小不兼容，重新分配
	cout << "B=" << endl << " " << B << endl << endl;
	cout << "MM=" << endl << " " << MM << endl << endl；

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