w2img::Correlogram::GaussianFit Class Reference

List of all members.

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Detailed Description

Fit a gaussian to a correlogram.

You can use this gaussian fit to get the correlation rho for any arbitrary distance.

The fit gaussian of the form f(h) = c exp( -(h/a)^2 ). c is called the sill and a is called the range. h is the distance between the two points.

Author:

Lakshman

Version:

Id

w2img_Correlogram.h,v 1.5 2009/06/02 20:17:57 lakshman Exp

Public Member Functions
	GaussianFit (const Correlogram &sample_rhos, size_t maxSamples=0)
	pass in the correlogram and how many samples you want to fit over.
bool	isValid () const
	won't be valid incase of singularity problems.
float	getSill () const
	Sill (c) of the fit equation.
float	getRange () const
	range (a) of the fit equation.
float	getDistance (float rho) const
	return the distance, h, at which the correlation falls below this value.
float	getRho (float dist) const
	get the correlation at a distance.
code::Image< float >	computeKernel () const
code::Image< float >	computeQuarterKernel () const

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Constructor & Destructor Documentation

w2img::Correlogram::GaussianFit::GaussianFit	(	const Correlogram &	sample_rhos,
		size_t	maxSamples = 0
	)

pass in the correlogram and how many samples you want to fit over.

Zero indicates everything ...

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Member Function Documentation

code::Image<float> w2img::Correlogram::GaussianFit::computeKernel

(

)

const

Returns:

a kernel suitable for using with KernelFilter. The center pixel corresponds to distance of 0 and is maximum.

code::Image<float> w2img::Correlogram::GaussianFit::computeQuarterKernel

(

)

const

Returns:

quadrant of full kernel (one quadrant) of rhos with distances. The 0,0 corresponds to distance of 0 and is maximum.

float w2img::Correlogram::GaussianFit::getDistance

(

float

rho

)

const

return the distance, h, at which the correlation falls below this value.

float w2img::Correlogram::GaussianFit::getRange

(

)

const [inline]

range (a) of the fit equation.

You *can* pass in distances > range

float w2img::Correlogram::GaussianFit::getRho

(

float

dist

)

const

get the correlation at a distance.

float w2img::Correlogram::GaussianFit::getSill

(

)

const [inline]

Sill (c) of the fit equation.

bool w2img::Correlogram::GaussianFit::isValid

(

)

const [inline]

won't be valid incase of singularity problems.

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