OpenCV  3.4.16 Open Source Computer Vision

## Functions

void cv::sfm::meanAndVarianceAlongRows (InputArray A, OutputArray mean, OutputArray variance)
Computes the mean and variance of a given matrix along its rows. More...

Mat cv::sfm::skew (InputArray x)
Returns the 3x3 skew symmetric matrix of a vector. More...

## ◆ meanAndVarianceAlongRows()

 void cv::sfm::meanAndVarianceAlongRows ( InputArray A, OutputArray mean, OutputArray variance )

#include <opencv2/sfm/numeric.hpp>

Computes the mean and variance of a given matrix along its rows.

Parameters
 A Input NxN matrix. mean Output Nx1 matrix with computed mean. variance Output Nx1 matrix with computed variance.

It computes in the same way as woud do reduce but with Variance function.

## ◆ skew()

 Mat cv::sfm::skew ( InputArray x )

#include <opencv2/sfm/numeric.hpp>

Returns the 3x3 skew symmetric matrix of a vector.

Parameters
 x Input 3x1 vector.

Reference: [94], p581, equation (A4.5).