convert Matrix of type CV_32FC1 to CV_64FC1
How do I convert a cv::Mat of type CV_32FC1 to the type CV_64FC1 (equivalent to a change from float to double)?
I am opening a Matrix that was saved as XML (cvSave
) but as a float. This means that the field <dt>
has the value f
in the file. I need to change it to d
to open it. But I'd rather not do this, instead I'd like to open it directly as a Matrix with elements of type double, or convert it later from float to double.
Below is my code for opening the file.
开发者_开发技巧/** Load cv::Mat from XML file.
*/
cv::Mat loadMat(const std::string filename)
{
cv::Mat result;
cv::FileStorage fs(filename, cv::FileStorage::READ);
fs.getFirstTopLevelNode() >> result;
return result;
}
Okay, I'm a dimwit. Here is how it goes:
There is the function convertTo that does exactly what I want.
Thanks for matrix type conversion in opencv for pointing this out.
Here is how I do it:
cv::Mat A = loadMat("mymat.xml"); // See function loadMat in the question!
A.convertTo(A, CV_64F);
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