DGtal::Signal< TValue > Class Template Reference

Aim: Represents a discrete signal, periodic or not. The signal can be passed by value since it is only cloned when modified. More...

#include <DGtal/math/Signal.h>

Public Types
typedef TValue	Value

Public Member Functions
	~Signal ()
	Signal ()
	Signal (unsigned int size, int z, bool periodic, const TValue &def=TValue(0))
	Signal (const TValue *t, unsigned int size, int z, bool periodic, const TValue &def=TValue(0))
	Signal (const Signal< TValue > &other)
Signal< TValue > &	operator= (const Signal< TValue > &other)
void	init (unsigned int s, int z=0, bool p=false, const TValue &def=TValue(0))
void	init (const TValue *t, unsigned int size, int z=0, bool p=false, const TValue &def=TValue(0))
unsigned int	size () const
TValue &	operator[] (int i)
const TValue &	operator[] (int i) const
void	setAll (const TValue &val=TValue(0))
void	multiply (const TValue &val)
Signal< TValue >	operator* (const Signal< TValue > &G)
void	selfDisplay (std::ostream &out) const
bool	isValid () const

Static Public Member Functions
static Signal< TValue >	G2 ()
static Signal< TValue >	H2 ()
static Signal< TValue >	Delta ()
static Signal< TValue >	G2n (unsigned int n)
static Signal< TValue >	H2n (unsigned int n)
static Signal< TValue >	D2n (unsigned int n)

Private Attributes
CowPtr< SignalData< TValue > >	m_data

Detailed Description

template<typename TValue>
class DGtal::Signal< TValue >

Aim: Represents a discrete signal, periodic or not. The signal can be passed by value since it is only cloned when modified.

Description of template class 'Signal'

Template Parameters

TValue

the type chosen for each sample (generally float or double).

This class is a backport from ImaGene.

Definition at line 161 of file Signal.h.

Member Typedef Documentation

Value

template<typename TValue >

typedef TValue DGtal::Signal< TValue >::Value

Definition at line 165 of file Signal.h.

Constructor & Destructor Documentation

~Signal()

template<typename TValue >

DGtal::Signal< TValue >::~Signal

(

)

Destructor.

Signal() [1/4]

template<typename TValue >

DGtal::Signal< TValue >::Signal

(

)

Constructor.

Signal() [2/4]

template<typename TValue >

DGtal::Signal< TValue >::Signal	(	unsigned int	size,
		int	z,
		bool	periodic,
		const TValue &	def = TValue(0)
	)

Constructor.

Parameters

size	the size of the signal.
z	the index of the zero-th element.
periodic	'true' if the signal is periodic.
def	the default value.

Signal() [3/4]

template<typename TValue >

DGtal::Signal< TValue >::Signal	(	const TValue *	t,
		unsigned int	size,
		int	z,
		bool	periodic,
		const TValue &	def = TValue(0)
	)

Constructor.

Parameters

t	the array containing initial data.
size	the size of the signal.
z	the index of the zero-th element.
periodic	'true' if the signal is periodic.
def	the default value.

Signal() [4/4]

template<typename TValue >

DGtal::Signal< TValue >::Signal

(

const Signal< TValue > &

other

)

Copy constructor.

Parameters

other

the object to clone.

Member Function Documentation

D2n()

template<typename TValue >

static Signal< TValue > DGtal::Signal< TValue >::D2n ( unsigned int  n )

static

Returns

the differential operator with binomial weights of order 2n.

Delta()

template<typename TValue >

static Signal< TValue > DGtal::Signal< TValue >::Delta ( )

static

Returns

the right difference signal.

G2()

template<typename TValue >

static Signal< TValue > DGtal::Signal< TValue >::G2 ( )

static

Returns

the gaussian signal of order 2 (binomial signal of order 2 / 4).

TValue must be able to represent real values.

G2n()

template<typename TValue >

static Signal< TValue > DGtal::Signal< TValue >::G2n ( unsigned int  n )

static

Returns

the gaussian signal of order 2n (binomial signal of order 2n / 2^n).

Referenced by testSignal().

H2()

template<typename TValue >

static Signal< TValue > DGtal::Signal< TValue >::H2 ( )

static

Returns

the binomial signal of order 2.

H2n()

template<typename TValue >

static Signal< TValue > DGtal::Signal< TValue >::H2n ( unsigned int  n )

static

Returns

the binomial signal of order 2n.

init() [1/2]

template<typename TValue >

void DGtal::Signal< TValue >::init	(	const TValue *	t,
		unsigned int	size,
		int	z = 0,
		bool	p = false,
		const TValue &	def = TValue(0)
	)

Initializer.

Parameters

t	the array containing initial data.
size	the size of the signal.
z	the index of the zero-th element.
p	'true' if the signal is periodic.
def	the default value.

init() [2/2]

template<typename TValue >

void DGtal::Signal< TValue >::init	(	unsigned int	s,
		int	z = 0,
		bool	p = false,
		const TValue &	def = TValue(0)
	)

Initializer.

Parameters

s	the number of data in the signal.
z	the index of the zero-th element.
p	'true' if the signal is periodic.
def	the default value.

isValid()

template<typename TValue >

bool DGtal::Signal< TValue >::isValid

(

)

const

Checks the validity/consistency of the object.

Returns

'true' if the object is valid, 'false' otherwise.

multiply()

template<typename TValue >

void DGtal::Signal< TValue >::multiply

(

const TValue &

val

)

External product of a signal by a scalar value.

Parameters

val	the external value.

operator*()

template<typename TValue >

Signal< TValue > DGtal::Signal< TValue >::operator*

(

const Signal< TValue > &

G

)

Convolution product of two signals (F = this). F*G( a ) = sum F(a-i)G(i)

Parameters

G	the second signal (not periodic)

Returns

the signal that is the convolution of F and G, of type F. The returned signal is periodic iff Fis periodic.

operator=()

template<typename TValue >

Signal< TValue > & DGtal::Signal< TValue >::operator=

(

const Signal< TValue > &

other

)

Assignment.

Parameters

other

the object to copy.

Returns

a reference on 'this'.

operator[]() [1/2]

template<typename TValue >

TValue & DGtal::Signal< TValue >::operator[]

(

int

i

)

Protected rw access to value. If index is out of bound, return 0 if not periodic or the correct value otherwise.

Parameters

i	the index in the signal .

Returns

the i-th value in the signal.

operator[]() [2/2]

template<typename TValue >

const TValue & DGtal::Signal< TValue >::operator[]

(

int

i

)

const

Protected ro access to value. If index is out of bound, return 0 if not periodic or the correct value otherwise.

Parameters

i	the index in the signal .

Returns

the i-th value in the signal.

selfDisplay()

template<typename TValue >

void DGtal::Signal< TValue >::selfDisplay

(

std::ostream &

out

)

const

Writes/Displays the object on an output stream.

Parameters

out	the output stream where the object is written.

setAll()

template<typename TValue >

void DGtal::Signal< TValue >::setAll

(

const TValue &

val = TValue(0)

)

The signal becomes a constant signal of value [val].

Parameters

val	the value of the whole signal.

size()

template<typename TValue >

unsigned int DGtal::Signal< TValue >::size

(

)

const

Returns

the number of elements in the signal.

Field Documentation

m_data

template<typename TValue >

CowPtr< SignalData<TValue> > DGtal::Signal< TValue >::m_data

private

the array that stores the data.

Definition at line 350 of file Signal.h.

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

• Signal.h