C++ 如何清除 cv::Mat 内容？
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How to clear the cv::Mat contents?
提问by anarchy99
I have a cv::Matbut I have already insert it with some values, how do I clear the contents in it?
我有一个cv::Mat但我已经插入了一些值，如何清除其中的内容？
Thank you
谢谢
回答by Alexey
If you want to release the memory of the Matvariable use release().
如果要释放Mat变量的内存，请使用release().
Mat m;
// initialize m or do some processing
m.release();
For a vector of cv::Matobjects you can release the memory of the whole vector with myvector.clear().
对于cv::Mat对象向量，您可以使用 释放整个向量的内存myvector.clear()。
std::vector<cv::Mat> myvector;
// initialize myvector ..
myvector.clear(); // to release the memory of the vector
回答by CapelliC
回答by Poko
You should call release() function.
您应该调用 release() 函数。
Mat img = Mat(Size(width, height), CV_8UC3, Scalar(0, 0, 0));
img.release();
回答by abggcv
You can releasethe current contents or assign a new Mat.
您可以release将当前内容或分配一个新的Mat.
Mat m = Mat::ones(1, 5, CV_8U);
cout << "m: " << m << endl;
m.release(); //this will remove Mat m from memory
//Another way to clear the contents is by assigning an empty Mat:
m = Mat();
//After this the Mat can be re-assigned another value for example:
m = Mat::zeros(2,3, CV_8U);
cout << "m: " << m << endl;
