Method ConvertTo

Converts an array to another data type with optional scaling.

public void ConvertTo(OutputArray m, MatType rtype, double alpha = 1, double beta = 0)

m OutputArray: output matrix; if it does not have a proper size or type before the operation, it is reallocated.
rtype MatType: desired output matrix type or, rather, the depth since the number of channels are the same as the input has; if rtype is negative, the output matrix will have the same type as the input.
alpha double: optional scale factor.
beta double: optional delta added to the scaled values.