Package jj2000.j2k.quantization

Class QuantTypeSpec

java.lang.Object

jj2000.j2k.ModuleSpec

jj2000.j2k.quantization.QuantTypeSpec

All Implemented Interfaces:

Cloneable

public class QuantTypeSpec
extends ModuleSpec

This class extends ModuleSpec class in order to hold specifications about the quantization type to use in each tile-component. Supported quantization type are:

• Reversible (no quantization)
• Derived (the quantization step size is derived from the one of the LL-subband)
• Expounded (the quantization step size of each subband is signalled in the codestream headers)

See Also:

ModuleSpec

Field Summary

Fields inherited from class jj2000.j2k.ModuleSpec

compDef, def, nComp, nTiles, SPEC_COMP_DEF, SPEC_DEF, SPEC_TILE_COMP, SPEC_TILE_DEF, SPEC_TYPE_COMP, SPEC_TYPE_TILE, SPEC_TYPE_TILE_COMP, specified, specType, specValType, tileCompVal, tileDef

Constructor Summary

Constructors

Constructor	Description
QuantTypeSpec(int nt, int nc, byte type)	Constructs an empty 'QuantTypeSpec' with specified number of tile and components.
QuantTypeSpec(int nt, int nc, byte type, J2KImageWriteParamJava wp, String values)	Constructs a new 'QuantTypeSpec' for the specified number of components and tiles and the arguments of "-Qtype" option.

Method Summary

Modifier and Type	Method	Description
boolean	isDerived(int t, int c)	Returns true if given tile-component uses derived quantization step size.
boolean	isFullyNonReversible()	Check the irreversibility of the whole image.
boolean	isFullyReversible()	Check the reversibility of the whole image.
boolean	isReversible(int t, int c)	Check the reversibility of the given tile-component.

Methods inherited from class jj2000.j2k.ModuleSpec

clone, getCompDef, getCopy, getDefault, getSpec, getSpecValType, getTileCompVal, getTileDef, isCompSpecified, isTileCompSpecified, isTileSpecified, parseIdx, rotate90, setCompDef, setDefault, setTileCompVal, setTileDef

Methods inherited from class java.lang.Object

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

Constructor Detail

QuantTypeSpec

public QuantTypeSpec(int nt,
                     int nc,
                     byte type)

Constructs an empty 'QuantTypeSpec' with specified number of tile and components. This constructor is called by the decoder.

Parameters:

nt - Number of tiles

nc - Number of components

type - the type of the specification module i.e. tile specific, component specific or both.

QuantTypeSpec

public QuantTypeSpec(int nt,
                     int nc,
                     byte type,
                     J2KImageWriteParamJava wp,
                     String values)

Constructs a new 'QuantTypeSpec' for the specified number of components and tiles and the arguments of "-Qtype" option. This constructor is called by the encoder.

Parameters:

nt - The number of tiles

nc - The number of components

type - the type of the specification module i.e. tile specific, component specific or both.

Method Detail

isDerived

public boolean isDerived(int t,
                         int c)

Returns true if given tile-component uses derived quantization step size.

Parameters:

t - Tile index

c - Component index

Returns:

True if derived quantization step size

isReversible

public boolean isReversible(int t,
                            int c)

Check the reversibility of the given tile-component.

Parameters:

t - The index of the tile

c - The index of the component

Returns:

Whether or not the tile-component is reversible

isFullyReversible

public boolean isFullyReversible()

Check the reversibility of the whole image.

Returns:

Whether or not the whole image is reversible

isFullyNonReversible

public boolean isFullyNonReversible()

Check the irreversibility of the whole image.

Returns:

Whether or not the whole image is reversible