MitchellFilter Struct Reference

#include <Resample.h>

Inheritance diagram for MitchellFilter:

Public Types
typedef boost::shared_ptr< const MitchellFilter >	CPtr
typedef boost::shared_ptr< MitchellFilter >	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 x) const
	Evaluates the filter at coordinate 't'.
	MitchellFilter (const float width=1.0, const float B=1.0/3.0, const float C=1.0/3.0)
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_B
const float	m_C
const float	m_width

Detailed Description

Definition at line 340 of file Resample.h.

Member Typedef Documentation

Ptr

typedef boost::shared_ptr<MitchellFilter> MitchellFilter::Ptr

Definition at line 343 of file Resample.h.

CPtr

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

Definition at line 344 of file Resample.h.

Constructor & Destructor Documentation

MitchellFilter()

MitchellFilter::MitchellFilter ( const float width = 1.0, const float B = 1.0 / 3.0, const float C = 1.0 / 3.0 )

inline

Definition at line 349 of file Resample.h.

    : m_B(B), m_C(C), m_width(width)
  { /* Empty */ }

References m_B, m_C, and m_width.

Member Function Documentation

eval()

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

inlinevirtual

Evaluates the filter at coordinate 't'.

Implements Filter.

Definition at line 354 of file Resample.h.

  {
    const float ax = std::abs(x / m_width);
    if (ax < 1) {
      return ((12 - 9 * m_B - 6 * m_C) * ax * ax * ax +
              (-18 + 12 * m_B + 6 * m_C) * ax * ax + (6 - 2 * m_B)) / 6;
    } else if ((ax >= 1) && (ax < 2)) {
      return ((-m_B - 6 * m_C) * ax * ax * ax +
              (6 * m_B + 30 * m_C) * ax * ax + (-12 * m_B - 48 * m_C) *
              ax + (8 * m_B + 24 * m_C)) / 6;
    } else {
      return 0;
    }
  }

References m_B, m_C, and m_width.

support()

virtual float MitchellFilter::support ( ) const

inlinevirtual

Radial width of the filter (half of diameter).

Implements Filter.

Definition at line 368 of file Resample.h.

  {
    return 2.0f * m_width;
  }

References m_width.

op()

template<typename Value_T>

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

inlinestatic

Definition at line 373 of file Resample.h.

  { /* No-op */ }

Member Data Documentation

isAnalytic

const bool MitchellFilter::isAnalytic = false

static

Definition at line 346 of file Resample.h.

m_B

const float MitchellFilter::m_B

private

Definition at line 376 of file Resample.h.

Referenced by eval(), and MitchellFilter().

m_C

const float MitchellFilter::m_C

private

Definition at line 376 of file Resample.h.

Referenced by eval(), and MitchellFilter().

m_width

const float MitchellFilter::m_width

private

Definition at line 377 of file Resample.h.

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

---

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

• export/Resample.h