GaussianFilter Struct Reference

#include <Resample.h>

Inheritance diagram for GaussianFilter:

Public Types
typedef boost::shared_ptr< const GaussianFilter >	CPtr
typedef boost::shared_ptr< GaussianFilter >	Ptr
Public Types inherited from Filter
typedef boost::shared_ptr< const Filter >	CPtr
typedef boost::shared_ptr< Filter >	Ptr

Public Member Functions
virtual float	eval (const float t) const
	Evaluates the filter at coordinate 't'.
	GaussianFilter (const float alpha=2.0, const float width=2.0)
virtual float	support () const
	Radial width of the filter (half of diameter).
Public Member Functions inherited from Filter
virtual float	initialValue () const
	Initial value (zero by default, but need to be different for min/max).

Static Public Member Functions
template<typename Value_T>
static void	op (Value_T &accumValue, const Value_T value)

Static Public Attributes
static const bool	isAnalytic = false

Private Attributes
const float	m_alpha
const float	m_exp
const float	m_width

Detailed Description

Definition at line 305 of file Resample.h.

Member Typedef Documentation

Ptr

typedef boost::shared_ptr<GaussianFilter> GaussianFilter::Ptr

Definition at line 308 of file Resample.h.

CPtr

typedef boost::shared_ptr<const GaussianFilter> GaussianFilter::CPtr

Definition at line 309 of file Resample.h.

Constructor & Destructor Documentation

GaussianFilter()

GaussianFilter::GaussianFilter ( const float alpha = 2.0, const float width = 2.0 )

inline

Definition at line 314 of file Resample.h.

    : m_alpha(alpha), 
      m_exp(std::exp(-alpha * width * width)),
      m_width(width)
  { /* Empty */ }

References m_alpha, m_exp, and m_width.

Member Function Documentation

eval()

virtual float GaussianFilter::eval ( const float t ) const

inlinevirtual

Evaluates the filter at coordinate 't'.

Implements Filter.

Definition at line 320 of file Resample.h.

  {
    const float x = t / m_width;
    return std::max(0.0f, std::exp(-m_alpha * x * x) - m_exp);
  }

References m_alpha, m_exp, and m_width.

support()

virtual float GaussianFilter::support ( ) const

inlinevirtual

Radial width of the filter (half of diameter).

Implements Filter.

Definition at line 325 of file Resample.h.

  {
    return 2.0f * m_width;
  }

References m_width.

op()

template<typename Value_T>

void GaussianFilter::op ( Value_T & accumValue, const Value_T value )

inlinestatic

Definition at line 330 of file Resample.h.

  { /* No-op */ }

Member Data Documentation

isAnalytic

const bool GaussianFilter::isAnalytic = false

static

Definition at line 311 of file Resample.h.

m_alpha

const float GaussianFilter::m_alpha

private

Definition at line 333 of file Resample.h.

Referenced by eval(), and GaussianFilter().

m_exp

const float GaussianFilter::m_exp

private

Definition at line 333 of file Resample.h.

Referenced by eval(), and GaussianFilter().

m_width

const float GaussianFilter::m_width

private

Definition at line 333 of file Resample.h.

Referenced by eval(), GaussianFilter(), and support().

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

• export/Resample.h