本文介绍了在OpenCV中更新Mat的子矩阵的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我使用OpenCV和C ++。我有一个矩阵X这样
I am working with OpenCV and C++. I have a matrix X like this
Mat X = Mat::zeros(13,6,CV_32FC1);
我想更新一个子矩阵4x3的，但我怀疑如何访问矩阵。
and I want to update just a submatrix 4x3 of it, but I have doubts on how to access that matrix in an efficient way.
Mat mat43= Mat::eye(4,3,CV_32FC1); //this is a submatrix at position (4,4)
？
推荐答案
最快的方法之一是设置一个标题矩阵指向要更新的列/行的范围，例如this：
One of the quickest ways is setting a header matrix pointing to the range of columns/rows you want to update, like this:
Mat aux = X.colRange(4,7).rowRange(4,8); // you are pointing to submatrix 4x3 at X(4,4)
现在，矩阵到aux（但实际上你会将它复制到X，因为aux只是一个指针）：
Now, you can copy your matrix to aux (but actually you will be copying it to X, because aux is just a pointer):
mat43.copyTo(aux);
就是这样。
这篇关于在OpenCV中更新Mat的子矩阵的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！