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Copy Multidimensional Matrix

asked 2016-12-16 10:17:04 -0500

atp gravatar image

Let's say I have a nxnx3 matrix and I want to copy that matrix into a nxnx5 matrix (and fill the remaining channels with other stuff). How can this be done in OpenCV? I'm looking for a solution that is not using a for loop.

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answered 2016-12-16 10:40:03 -0500

LBerger gravatar image

Split and merge :

Mat x(5,5,CV_32FC3,Scalar(1,2,3));
Mat y=Mat::zeros(5,5,CV_32FC(5));
vector<Mat> xPlan,yPlan;
cout << "x =" << x << "\n";
cout << "y =" << y << "\n";
split(x,xPlan);
split(y,yPlan);
xPlan.push_back(yPlan[3]);
xPlan.push_back(yPlan[4]);
merge(xPlan,y);
cout << "y =" << y << "\n";
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Interesting. I was not aware of CV_32FC(k) to create a matrix with k channels. I created a multidimensional matrix using:

int sizes[3] = {100, 100, 5};
cv::Mat img(3, sizes, CV_32F);

Would your code work in this case as well?

atp gravatar imageatp ( 2016-12-16 12:29:10 -0500 )edit

for 3d arrays I don't think opencv is ready. You can read this post

LBerger gravatar imageLBerger ( 2016-12-16 12:59:10 -0500 )edit
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Asked: 2016-12-16 10:17:04 -0500

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Last updated: Dec 16 '16