opencv Mat类赋值函数copyTo、clone的区别

最新推荐文章于 2025-06-06 15:29:36 发布

DreamLike_zzg

最新推荐文章于 2025-06-06 15:29:36 发布

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分类专栏： opencv 文章标签： opencv clone copyTo

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本文详细解析了OpenCV中Mat对象的copyTo与clone方法的行为差异，特别是针对空间分配与共享机制进行了说明。通过具体的代码示例展示了不同情况下这两种方法的工作原理。

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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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