randn function
RandN Fills the array with normally distributed random numbers.
For further details, please see: https://docs.opencv.org/master/d2/de8/group__core__array.html#gaeff1f61e972d133a04ce3a5f81cf6808
Implementation
Mat randn(InputOutputArray dst, Scalar mean, Scalar stddev) {
cvRun(() => ccore.RandN(dst.ref, mean.ref, stddev.ref));
return dst;
}