Function meanStdDev

meanStdDev(mat, mask?): {
mean: Mat;
stddev: Mat;
}
Calculates a mean and standard deviation of array elements.

https://docs.opencv.org/4.x/d2/de8/group__core__array.html#ga846c858f4004d59493d7c6a4354b301d
Parameters
- mat: Mat
- Optional mask: Mat
  optional operation mask.
  
  cv.meanStdDev( src[, mean[, stddev[, mask]]] ) -> mean, stddev TODO
Returns {
mean: Mat;
stddev: Mat;
}
- mean: Mat
- stddev: Mat
- Defined in node_modules/@u4/opencv4nodejs/typings/group/core_array.d.ts:238