Struct lsst::afw::image::pixel::variance_plus_covar

template<typename T1>
struct variance_plus_covar

The variance of the sum of a pair of correlated pixels

The covariance is modelled as alpha*sqrt(var_x*var_y)

Note

We provide a single-operand version for when the right-hand-side of an expression is a scalar, not a masked pixel,