CODEWITHSUNDEEP
c++matlabopencvmatrixyaml
el_raffa
el_raffa

Reputation: 1

4D Matrix from Matlab to OpenCV

I have to export matrices from Matlab to OpenCV. I use the yaml format and then read the file in OpenCV with cv::FileStorage modelFile, and store the data in cv::Mat variables. For normal 2D Matrices, it works fine. But, for one of my big 4D Matrix, I get errors that the string is too long. The Matrix has the size of 16|16|70409|8.

Does someone know a good way to store it? Maybe it is only a format problem.

The code is:

for i = 1:matrixSize(1)
   for j=1:matrixSize(2) 
       fprintf( file, '    - [');   
       for a = 1:matrixSize(3)
           for b = 1:matrixSize(4)
               fprintf( file, '%.6f', A(i,j,a,b));
               if(a ~= matrixSize(3))
                fprintf( file, ',');
               end
           end
       end
       fprintf( file, ']\n');
   end
end

Thanks

Upvotes: 0

Views: 467

Answers (1)

el_raffa
el_raffa

Reputation: 1

my solution is to use instead of yaml, save the model in binary format and then read it with the normal fread functions. Of course you have to know the size of each matrices. 

fileID = fopen(BinModel,'w');
fwrite(fileID,[size(model.nSegs),0,0],'uint32'); % size of the matrix 
fwrite(fileID,model.nSegs,'uint8'); % matrix data

The file shrinks from 1.4 GB to 200 MB.

Saludo

Upvotes: 0

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