Class Filter

java.lang.Object

org.apache.pdfbox.jbig2.image.Filter

Direct Known Subclasses:

Filter.Bessel, Filter.Blackman, Filter.Box, Filter.Catrom, Filter.Cubic, Filter.Gaussian, Filter.Hamming, Filter.Hanning, Filter.Hermite, Filter.Lanczos, Filter.Mitchell, Filter.Quadratic, Filter.Sinc, Filter.Triangle

abstract class Filter
extends Object

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static final class	Filter.Bessel
static final class	Filter.Blackman
static class	Filter.Box
static final class	Filter.Catrom
static final class	Filter.Cubic
static final class	Filter.Gaussian
static final class	Filter.Hamming
static final class	Filter.Hanning
static final class	Filter.Hermite
static final class	Filter.Lanczos
static final class	Filter.Mitchell
static final class	Filter.Point
static final class	Filter.Quadratic
static final class	Filter.Sinc
static final class	Filter.Triangle

Field Summary

Fields

Modifier and Type	Field	Description
(package private) double	blur	blur factor (1=normal)
(package private) final boolean	cardinal	is this filter cardinal? ie, does func(x) = (x==0) for integer x?
(package private) double	support	radius of nonzero portion

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	Filter()
protected	Filter(boolean cardinal, double support, double blur)

Method Summary

Modifier and Type	Method	Description
static Filter	byType(FilterType type)	Find a filter by its type.
abstract double	f(double x)
double	fWindowed(double x)
double	getBlur()
String	getName()	Return the filter name.
double	getSupport()
static String	nameByType(FilterType type)	Find a filter name by its type.
void	setBlur(double blur)
void	setSupport(double support)
static FilterType	typeByName(String name)	Find a filter type by its name.

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

cardinal

final boolean cardinal

is this filter cardinal? ie, does func(x) = (x==0) for integer x?

support

double support

radius of nonzero portion

blur

double blur

blur factor (1=normal)

Constructor Details

Filter

protected Filter()

Filter

protected Filter(boolean cardinal,
 double support,
 double blur)

Method Details

nameByType

public static String nameByType(FilterType type)

Find a filter name by its type.

Parameters:

type - the filter type

Returns:

filter name

typeByName

public static FilterType typeByName(String name)

Find a filter type by its name.

Parameters:

name - the filter name

Returns:

filter type

byType

public static Filter byType(FilterType type)

Find a filter by its type.

Parameters:

type - the filter type

Returns:

the Filter

fWindowed

public double fWindowed(double x)

f

public abstract double f(double x)

getName

public String getName()

Return the filter name.

Returns:

the filter's name

getSupport

public double getSupport()

Returns:

the support

setSupport

public void setSupport(double support)

Parameters:

support - the support to set

getBlur

public double getBlur()

Returns:

the blur

setBlur

public void setBlur(double blur)

Parameters:

blur - the blur to set