cv :: Mat或CvMat中的大数据*

Question

Is CV_64F largest dimension/size of a single unit of data that can be stored in a Matrix ( cv::Mat or CvMat*) using OpenCV ? Is there anything larger than that?

I want to store large sized data like a long double in a cv::Mat. Is there any way I can do it without using arrays?

Answer 1

As far as I can tell, you can do this sort of . You can use the Mat_ template class. Below is a short example I wrote:

#include <opencv2/core/core.hpp>    
#include <iostream>

using namespace std;
using namespace cv;


int main(int argc, char* argv[])
{
    Mat_<long double> testing(Size(5, 5));

    // initialize matrix to ones
    for(int i = 0; i < testing.rows; i++)
    {
        for(int j = 0; j < testing.cols; j++)
        {
            testing.at<long double>(i, j) = 1;
        }
    }

    cout << "Element size in bytes is " << testing.elemSize() << "." << endl;

    return 0;
}

Now for the caveat... If you try to use many of the helper methods, ones , zeros , operator<< , and others), you will likely see this error:

OpenCV Error: Unsupported format or combination of formats () in scalarToRawData

Hopefully that will be enough that you can use it for some things, but it won't be as clean as usual.