Mat :: push_back（x）是否复制x元素？ [英] Does Mat::push_back(x) copy x elements?

问题描述

基于我的谦卑的理解，OpenCV的Mat有效地处理内存管理;所以复制Mats并不意味着他们硬/物理复制;它们只是引用了原始的Mat。

Based on my humble understanding, OpenCV's Mat handles the memory management efficiently; so copying Mats does not mean they are "hard/physically" copied; they just refer to the original Mat.

然而，对于已经使用push_back推入更大的Mat的mat，它是安全的，假设它们被硬复制，不使用相同的复制技术，如 x = y ？

However, for mats that has been pushed into a larger Mat using push_back, is it safe to clear them assuming that they were hard copied, not using same technique of copying like in x=y?

在下面的代码中， bigx 即使在发布后者仍然有 x 的内容吗？

In the following code, does bigx still has x's contents even after releasing the latter?

Mat x, bigx;
bigx.push_back(x);
x.release();

谢谢：）

推荐答案

据我所知Mat :: pushback（）将在每个推后创建一个单独的源副本。

As far as I know Mat::pushback() will create a separate copy of source on each pushback. So you can release your source after pushback.

查看下面的示例，

   Mat src=imread("src.jpg",1);
   int rowSize=src.rows;
   Mat A;
   A.push_back(src.reshape(0,1));
   src.release();

   Mat B;
   B = A.row(0).clone();
   imshow("src",B.reshape(0,rowSize));
   waitKey(); 

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