lsst::afw::image::pixel::variance_plus_covar< T1 > Struct Template Reference

The variance of the sum of a pair of correlated pixels. More...

#include <Pixel.h>

Public Member Functions
	variance_plus_covar (double alpha=0)
T1	operator() (T1 const &, T1 const &, T1 const &vx, T1 const &vy) const
T1	operator() (T1 const &, T1 const &, T1 const &vx) const

Private Attributes
double	_alpha

Detailed Description

template<typename T1>
struct lsst::afw::image::pixel::variance_plus_covar< T1 >

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,

Definition at line 400 of file Pixel.h.

Constructor & Destructor Documentation

template<typename T1 >

lsst::afw::image::pixel::variance_plus_covar< T1 >::variance_plus_covar ( double  alpha = 0 )

inline

Definition at line 401 of file Pixel.h.

: _alpha(alpha) {}    

Member Function Documentation

template<typename T1 >

T1 lsst::afw::image::pixel::variance_plus_covar< T1 >::operator() ( T1 const &  , T1 const &  , T1 const &  vx, T1 const &  vy  ) const

inline

Definition at line 403 of file Pixel.h.

                                                                          {
        return vx + vy + 2*_alpha*sqrt(vx*vy);
    }

template<typename T1 >

T1 lsst::afw::image::pixel::variance_plus_covar< T1 >::operator() ( T1 const &  , T1 const &  , T1 const &  vx  ) const

inline

Definition at line 406 of file Pixel.h.

                                                            {
        return vx;
    }

Member Data Documentation

template<typename T1 >

double lsst::afw::image::pixel::variance_plus_covar< T1 >::_alpha

private

Definition at line 410 of file Pixel.h.

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The documentation for this struct was generated from the following file:

• /home/lsstsw/stack/Linux64/afw/11.0-2-g04d2804/include/lsst/afw/image/Pixel.h