jj2000.j2k.codestream.reader

Class BitstreamReaderAgent

java.lang.Object

jj2000.j2k.codestream.reader.BitstreamReaderAgent

All Implemented Interfaces:

CodedCBlkDataSrcDec, InvWTData, MultiResImgData

Direct Known Subclasses:

FileBitstreamReaderAgent

public abstract class BitstreamReaderAgent
extends Object
implements CodedCBlkDataSrcDec

This is the generic interface for bit stream reader agents. A bit stream reader agent is an entity that allows reading from a bit stream and requesting compressed code-blocks. It can be a simple file reader, or a network connection, or anything else.

The bit stream reader agent allows to make request for compressed block data in any order. The amount of data returned would normally depend on the data available at the time of the request, be it from a file or from a network connection.

The bit stream reader agent has the notion of a current tile, and coordinates are relative to the current tile, where applicable.

Resolution level 0 is the lowest resolution level, i.e. the LL subband alone.

Field Summary

Fields

Modifier and Type	Field and Description
protected int	anbytes Actual number of read bytes
protected float	arate Actual decoding rate in bpp
protected int	ax The horizontal coordinate of the image origin in the canvas system, on the reference grid.
protected int	ay The vertical coordinate of the image origin in the canvas system, on the reference grid.
protected int	ctX The current tile horizontal index
protected int	ctY The current tile vertical index
protected int[]	culx The horizontal coordinates of the upper-left corner of the active tile, with respect to the canvas origin, in the component hi-res grid, for each component.
protected int[]	culy The vertical coordinates of the upper-left corner of the active tile, with respect to the canvas origin, in the component hi-res grid, for each component.
protected DecoderSpecs	decSpec The decoder specifications
protected boolean[]	derived Whether or not the components in the current tile uses a derived quantization step size (only relevant in non reversible quantization mode).
protected int[]	gb Number of guard bits off all component in the current tile.
protected HeaderDecoder	hd The decoded bit stream header
protected int	imgH The image width on the hi-res reference grid
protected int	imgW The image width on the hi-res reference grid
protected int[]	mdl The maximum number of decompostion levels for each component of the current tile.
protected int	nc The number of components
protected int	nt The total number of tiles.
protected int	ntH The nominal tile height, in the hi-res reference grid
protected int	ntW The nominal tile width, in the hi-res reference grid
protected int	ntX The number of tile in the horizontal direction
protected int	ntY The number of tiles in the vertical direction
protected int[]	offX The horizontal offsets of the upper-left corner of the current tile (not active tile) with respect to the canvas origin, in the component hi-res grid, for each component.
protected int[]	offY The vertical offsets of the upper-left corner of the current tile (not active tile) with respect to the canvas origin, in the component hi-res grid, for each component.
static char	OPT_PREFIX The prefix for bit stream reader options: 'B'
protected StdDequantizerParams[]	params Dequantization parameters of all subbands and all components in the current tile.
protected int	px The horizontal coordinate of the tiling origin in the canvas system, on the reference grid.
protected int	py The vertical coordinate of the tiling origin in the canvas system, on the reference grid.
protected SubbandSyn[]	subbTrees The subband trees for each component in the current tile.
protected int	targetRes Image resolution level to generate
protected int	tnbytes Number of bytes targeted to be read
protected float	trate Target decoding rate in bpp

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	BitstreamReaderAgent(HeaderDecoder hd, DecoderSpecs decSpec) Initializes members of this class.

Method Summary

Methods

Modifier and Type	Method and Description
static BitstreamReaderAgent	createInstance(RandomAccessIO in, HeaderDecoder hd, J2KImageReadParamJava j2krparam, DecoderSpecs decSpec, boolean cdstrInfo, HeaderInfo hi) Creates a bit stream reader of the correct type that works on the provided RandomAccessIO, with the special parameters from the parameter list.
int	getActualNbytes() Return the actual number of read bytes.
float	getActualRate() Return the actual decoding rate in bits per pixel.
int	getCbULX() Returns the vertical code-block partition origin.
int	getCbULY() Returns the vertical code-block partition origin.
int	getCompImgHeight(int c, int rl) Returns the height in pixels of the specified component in the overall image, for the given (component) resolution level.
int	getCompImgWidth(int c, int rl) Returns the width in pixels of the specified component in the overall image, for the given (component) resolution level.
int	getCompSubsX(int c) Returns the component subsampling factor in the horizontal direction, for the specified component.
int	getCompSubsY(int c) Returns the component subsampling factor in the vertical direction, for the specified component.
int	getImgHeight(int rl) Returns the overall height of the image in pixels, for the given resolution level.
int	getImgRes() Returns the image resolution level to reconstruct from the codestream.
int	getImgULX(int rl) Returns the horizontal coordinate of the image origin, the top-left corner, in the canvas system, on the reference grid at the specified resolution level.
int	getImgULY(int rl) Returns the vertical coordinate of the image origin, the top-left corner, in the canvas system, on the reference grid at the specified resolution level.
int	getImgWidth(int rl) Returns the overall width of the image in pixels, for the given (image) resolution level.
int	getNomTileHeight() Returns the nominal tile height
int	getNomTileWidth() Returns the nominal tile width
int	getNumComps() Returns the number of components in the image.
int	getNumTiles() Returns the total number of tiles in the image.
Point	getNumTiles(Point co) Returns the number of tiles in the horizontal and vertical directions.
static String[][]	getParameterInfo() Returns the parameters that are used in this class and implementing classes.
int	getPPX(int t, int c, int rl) Returns the precinct partition width for the specified tile-component and (tile-component) resolution level.
int	getPPY(int t, int c, int rl) Returns the precinct partition height for the specified tile-component and (tile-component) resolution level.
int	getResULX(int c, int rl) Returns the horizontal coordinate of the upper-left corner of the specified resolution in the given component of the current tile.
int	getResULY(int c, int rl) Returns the vertical coordinate of the upper-left corner of the specified component in the given component of the current tile.
SubbandSyn	getSynSubbandTree(int t, int c) Returns the subband tree, for the specified tile-component.
int	getTargetNbytes() Return the target number of read bytes.
float	getTargetRate() Return the target decoding rate in bits per pixel.
Point	getTile(Point co) Returns the indexes of the current tile.
int	getTileCompHeight(int t, int c, int rl) Returns the height in pixels of the specified tile-component for the given (tile-component) resolution level.
int	getTileCompWidth(int t, int c, int rl) Returns the width in pixels of the specified tile-component for the given (tile-component) resolution level.
int	getTileHeight(int rl) Returns the overall height of the current tile in pixels, for the given resolution level.
int	getTileIdx() Returns the index of the current tile, relative to a standard scan-line order.
int	getTilePartULX() Returns the horizontal offset of tile partition
int	getTilePartULY() Returns the vertical offset of tile partition
int	getTileWidth(int rl) Returns the overall width of the current tile in pixels for the given (tile) resolution level.
protected void	initSubbandsFields(int c, SubbandSyn sb) Initialises subbands fields, such as code-blocks dimension and number of magnitude bits, in the subband tree.
abstract void	nextTile() Advances to the next tile, in standard scan-line order (by rows then columns).
abstract void	setTile(int x, int y) Changes the current tile, given the new indexes.

Methods inherited from class java.lang.Object

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

Methods inherited from interface jj2000.j2k.entropy.decoder.CodedCBlkDataSrcDec

getCodeBlock

Field Detail

decSpec

protected DecoderSpecs decSpec

The decoder specifications

derived

protected boolean[] derived

Whether or not the components in the current tile uses a derived quantization step size (only relevant in non reversible quantization mode). This field is actualized by the setTile method in FileBitstreamReaderAgent.

See Also:

initSubbandsFields(int, jj2000.j2k.wavelet.synthesis.SubbandSyn)

gb

protected int[] gb

Number of guard bits off all component in the current tile. This field is actualized by the setTile method in FileBitstreamReaderAgent.

See Also:

initSubbandsFields(int, jj2000.j2k.wavelet.synthesis.SubbandSyn)

params

protected StdDequantizerParams[] params

Dequantization parameters of all subbands and all components in the current tile. The value is actualized by the setTile method in FileBitstreamReaderAgent.

See Also:

initSubbandsFields(int, jj2000.j2k.wavelet.synthesis.SubbandSyn)

OPT_PREFIX

public static final char OPT_PREFIX

The prefix for bit stream reader options: 'B'

See Also:

Constant Field Values

mdl

protected int[] mdl

The maximum number of decompostion levels for each component of the current tile. It means that component c has mdl[c]+1 resolution levels (indexed from 0 to mdl[c])

nc

protected final int nc

The number of components

targetRes

protected int targetRes

Image resolution level to generate

subbTrees

protected SubbandSyn[] subbTrees

The subband trees for each component in the current tile. Each element in the array is the root element of the subband tree for a component. The number of magnitude bits in each subband (magBits member variable) is not initialized.

imgW

protected final int imgW

The image width on the hi-res reference grid

imgH

protected final int imgH

The image width on the hi-res reference grid

ax

protected final int ax

The horizontal coordinate of the image origin in the canvas system, on the reference grid.

ay

protected final int ay

The vertical coordinate of the image origin in the canvas system, on the reference grid.

px

protected final int px

The horizontal coordinate of the tiling origin in the canvas system, on the reference grid.

py

protected final int py

The vertical coordinate of the tiling origin in the canvas system, on the reference grid.

offX

protected final int[] offX

The horizontal offsets of the upper-left corner of the current tile (not active tile) with respect to the canvas origin, in the component hi-res grid, for each component.

offY

protected final int[] offY

The vertical offsets of the upper-left corner of the current tile (not active tile) with respect to the canvas origin, in the component hi-res grid, for each component.

culx

protected final int[] culx

The horizontal coordinates of the upper-left corner of the active tile, with respect to the canvas origin, in the component hi-res grid, for each component.

culy

protected final int[] culy

The vertical coordinates of the upper-left corner of the active tile, with respect to the canvas origin, in the component hi-res grid, for each component.

ntW

protected final int ntW

The nominal tile width, in the hi-res reference grid

ntH

protected final int ntH

The nominal tile height, in the hi-res reference grid

ntX

protected final int ntX

The number of tile in the horizontal direction

ntY

protected final int ntY

The number of tiles in the vertical direction

nt

protected final int nt

The total number of tiles.

ctX

protected int ctX

The current tile horizontal index

ctY

protected int ctY

The current tile vertical index

hd

protected final HeaderDecoder hd

The decoded bit stream header

tnbytes

protected int tnbytes

Number of bytes targeted to be read

anbytes

protected int anbytes

Actual number of read bytes

trate

protected float trate

Target decoding rate in bpp

arate

protected float arate

Actual decoding rate in bpp

Constructor Detail

BitstreamReaderAgent

protected BitstreamReaderAgent(HeaderDecoder hd,
                    DecoderSpecs decSpec)

Initializes members of this class. This constructor takes a HeaderDecoder object. This object must be initialized by the constructor of the implementing class from the header of the bit stream.

Parameters:

hd - The decoded header of the bit stream from where to initialize the values.

decSpec - The decoder specifications

Method Detail

getCbULX

public final int getCbULX()

Returns the vertical code-block partition origin. Allowable values are 0 and 1, nothing else.

Specified by:

getCbULX in interface InvWTData

getCbULY

public int getCbULY()

Returns the vertical code-block partition origin. Allowable values are 0 and 1, nothing else.

Specified by:

getCbULY in interface InvWTData

getNumComps

public final int getNumComps()

Returns the number of components in the image.

Specified by:

getNumComps in interface MultiResImgData

Returns:

The number of components in the image.

getCompSubsX

public final int getCompSubsX(int c)

Returns the component subsampling factor in the horizontal direction, for the specified component. This is, approximately, the ratio of dimensions between the reference grid and the component itself, see the 'ImgData' interface desription for details.

Specified by:

getCompSubsX in interface MultiResImgData

Parameters:

c - The index of the component (between 0 and N-1)

Returns:

The horizontal subsampling factor of component 'c'

See Also:

ImgData

getCompSubsY

public int getCompSubsY(int c)

Returns the component subsampling factor in the vertical direction, for the specified component. This is, approximately, the ratio of dimensions between the reference grid and the component itself, see the 'ImgData' interface desription for details.

Specified by:

getCompSubsY in interface MultiResImgData

Parameters:

c - The index of the component (between 0 and C-1)

Returns:

The vertical subsampling factor of component 'c'

See Also:

ImgData

getTileWidth

public int getTileWidth(int rl)

Returns the overall width of the current tile in pixels for the given (tile) resolution level. This is the tile's width without accounting for any component subsampling.

Note: Tile resolution level indexes may be different from tile-component resolution index. They are indeed indexed starting from the lowest number of decomposition levels of each component of the tile.

For an image (1 tile) with 2 components (component 0 having 2 decomposition levels and component 1 having 3 decomposition levels), the first (tile-)component has 3 resolution levels and the second one has 4 resolution levels, whereas the tile has only 3 resolution levels available.

Specified by:

getTileWidth in interface MultiResImgData

Parameters:

rl - The (tile) resolution level.

Returns:

The current tile's width in pixels.

getTileHeight

public int getTileHeight(int rl)

Returns the overall height of the current tile in pixels, for the given resolution level. This is the tile's height without accounting for any component subsampling.

Note: Tile resolution level indexes may be different from tile-component resolution index. They are indeed indexed starting from the lowest number of decomposition levels of each component of the tile.

For an image (1 tile) with 2 components (component 0 having 2 decomposition levels and component 1 having 3 decomposition levels), the first (tile-)component has 3 resolution levels and the second one has 4 resolution levels, whereas the tile has only 3 resolution levels available.

Specified by:

getTileHeight in interface MultiResImgData

Parameters:

rl - The (tile) resolution level.

Returns:

The total current tile's height in pixels.

getImgWidth

public int getImgWidth(int rl)

Returns the overall width of the image in pixels, for the given (image) resolution level. This is the image's width without accounting for any component subsampling or tiling.

Note: Image resolution level indexes may differ from tile-component resolution index. They are indeed indexed starting from the lowest number of decomposition levels of each component of each tile.

Example: For an image (1 tile) with 2 components (component 0 having 2 decomposition levels and component 1 having 3 decomposition levels), the first (tile-) component has 3 resolution levels and the second one has 4 resolution levels, whereas the image has only 3 resolution levels available.

Specified by:

getImgWidth in interface MultiResImgData

Parameters:

rl - The image resolution level.

Returns:

The total image's width in pixels.

getImgHeight

public int getImgHeight(int rl)

Returns the overall height of the image in pixels, for the given resolution level. This is the image's height without accounting for any component subsampling or tiling.

Note: Image resolution level indexes may differ from tile-component resolution index. They are indeed indexed starting from the lowest number of decomposition levels of each component of each tile.

Example: For an image (1 tile) with 2 components (component 0 having 2 decomposition levels and component 1 having 3 decomposition levels), the first (tile-) component has 3 resolution levels and the second one has 4 resolution levels, whereas the image has only 3 resolution levels available.

Specified by:

getImgHeight in interface MultiResImgData

Parameters:

rl - The image resolution level, from 0 to L.

Returns:

The total image's height in pixels.

getImgULX

public int getImgULX(int rl)

Returns the horizontal coordinate of the image origin, the top-left corner, in the canvas system, on the reference grid at the specified resolution level.

Note: Image resolution level indexes may differ from tile-component resolution index. They are indeed indexed starting from the lowest number of decomposition levels of each component of each tile.

Example: For an image (1 tile) with 2 components (component 0 having 2 decomposition levels and component 1 having 3 decomposition levels), the first (tile-) component has 3 resolution levels and the second one has 4 resolution levels, whereas the image has only 3 resolution levels available.

Specified by:

getImgULX in interface MultiResImgData

Parameters:

rl - The resolution level, from 0 to L.

Returns:

The horizontal coordinate of the image origin in the canvas system, on the reference grid.

getImgULY

public int getImgULY(int rl)

Returns the vertical coordinate of the image origin, the top-left corner, in the canvas system, on the reference grid at the specified resolution level.

Note: Image resolution level indexes may differ from tile-component resolution index. They are indeed indexed starting from the lowest number of decomposition levels of each component of each tile.

Example: For an image (1 tile) with 2 components (component 0 having 2 decomposition levels and component 1 having 3 decomposition levels), the first (tile-) component has 3 resolution levels and the second one has 4 resolution levels, whereas the image has only 3 resolution levels available.

Specified by:

getImgULY in interface MultiResImgData

Parameters:

rl - The resolution level, from 0 to L.

Returns:

The vertical coordinate of the image origin in the canvas system, on the reference grid.

getTileCompWidth

public final int getTileCompWidth(int t,
                   int c,
                   int rl)

Returns the width in pixels of the specified tile-component for the given (tile-component) resolution level.

Specified by:

getTileCompWidth in interface MultiResImgData

Parameters:

t - The tile index

c - The index of the component, from 0 to N-1.

rl - The resolution level, from 0 to L.

Returns:

The width in pixels of component c in tile t for resolution level rl.

getTileCompHeight

public final int getTileCompHeight(int t,
                    int c,
                    int rl)

Returns the height in pixels of the specified tile-component for the given (tile-component) resolution level.

Specified by:

getTileCompHeight in interface MultiResImgData

Parameters:

t - The tile index.

c - The index of the component, from 0 to N-1.

rl - The resolution level, from 0 to L.

Returns:

The height in pixels of component c in the current tile.

getCompImgWidth

public final int getCompImgWidth(int c,
                  int rl)

Returns the width in pixels of the specified component in the overall image, for the given (component) resolution level.

Note: Component resolution level indexes may differ from tile-component resolution index. They are indeed indexed starting from the lowest number of decomposition levels of same component of each tile.

Example: For an image (2 tiles) with 1 component (tile 0 having 2 decomposition levels and tile 1 having 3 decomposition levels), the first tile(-component) has 3 resolution levels and the second one has 4 resolution levels, whereas the component has only 3 resolution levels available.

Specified by:

getCompImgWidth in interface MultiResImgData

Parameters:

c - The index of the component, from 0 to N-1.

rl - The resolution level, from 0 to L.

Returns:

The width in pixels of component c in the overall image.

getCompImgHeight

public final int getCompImgHeight(int c,
                   int rl)

Returns the height in pixels of the specified component in the overall image, for the given (component) resolution level.

Note: Component resolution level indexes may differ from tile-component resolution index. They are indeed indexed starting from the lowest number of decomposition levels of same component of each tile.

Example: For an image (2 tiles) with 1 component (tile 0 having 2 decomposition levels and tile 1 having 3 decomposition levels), the first tile(-component) has 3 resolution levels and the second one has 4 resolution levels, whereas the component has only 3 resolution levels available.

Specified by:

getCompImgHeight in interface MultiResImgData

Parameters:

c - The index of the component, from 0 to N-1.

rl - The resolution level, from 0 to L.

Returns:

The height in pixels of component c in the overall image.

setTile

public abstract void setTile(int x,
           int y)

Changes the current tile, given the new indexes. An IllegalArgumentException is thrown if the indexes do not correspond to a valid tile.

Specified by:

setTile in interface MultiResImgData

Parameters:

x - The horizontal indexes the tile.

y - The vertical indexes of the new tile.

nextTile

public abstract void nextTile()

Advances to the next tile, in standard scan-line order (by rows then columns). An NoNextElementException is thrown if the current tile is the last one (i.e. there is no next tile).

Specified by:

nextTile in interface MultiResImgData

getTile

public final Point getTile(Point co)

Returns the indexes of the current tile. These are the horizontal and vertical indexes of the current tile.

Specified by:

getTile in interface MultiResImgData

Parameters:

co - If not null this object is used to return the information. If null a new one is created and returned.

Returns:

The current tile's indexes (vertical and horizontal indexes).

getTileIdx

public final int getTileIdx()

Returns the index of the current tile, relative to a standard scan-line order.

Specified by:

getTileIdx in interface MultiResImgData

Returns:

The current tile's index (starts at 0).

getResULX

public final int getResULX(int c,
            int rl)

Returns the horizontal coordinate of the upper-left corner of the specified resolution in the given component of the current tile.

Specified by:

getResULX in interface MultiResImgData

Parameters:

c - The component index.

rl - The resolution level index.

getResULY

public final int getResULY(int c,
            int rl)

Returns the vertical coordinate of the upper-left corner of the specified component in the given component of the current tile.

Specified by:

getResULY in interface MultiResImgData

Parameters:

c - The component index.

rl - The resolution level index.

getNumTiles

public final Point getNumTiles(Point co)

Returns the number of tiles in the horizontal and vertical directions.

Specified by:

getNumTiles in interface MultiResImgData

Parameters:

co - If not null this object is used to return the information. If null a new one is created and returned.

Returns:

The number of tiles in the horizontal (Point.x) and vertical (Point.y) directions.

getNumTiles

public final int getNumTiles()

Returns the total number of tiles in the image.

Specified by:

getNumTiles in interface MultiResImgData

Returns:

The total number of tiles in the image.

getSynSubbandTree

public final SubbandSyn getSynSubbandTree(int t,
                           int c)

Returns the subband tree, for the specified tile-component. This method returns the root element of the subband tree structure, see Subband and SubbandSyn. The tree comprises all the available resolution levels.

Note: this method is not able to return subband tree for a tile different than the current one.

The number of magnitude bits ('magBits' member variable) for each subband is not initialized.

Specified by:

getSynSubbandTree in interface InvWTData

Specified by:

getSynSubbandTree in interface MultiResImgData

Parameters:

t - The tile index

c - The index of the component, from 0 to C-1.

Returns:

The root of the tree structure.

createInstance

public static BitstreamReaderAgent createInstance(RandomAccessIO in,
                                  HeaderDecoder hd,
                                  J2KImageReadParamJava j2krparam,
                                  DecoderSpecs decSpec,
                                  boolean cdstrInfo,
                                  HeaderInfo hi)
                                           throws IOException

Creates a bit stream reader of the correct type that works on the provided RandomAccessIO, with the special parameters from the parameter list.

Parameters:

in - The RandomAccessIO source from which to read the bit stream.

hd - Header of the codestream.

j2krparam - The parameters applicable to the bit stream read (other parameters may also be present).

decSpec - The decoder specifications

cdstrInfo - Whether or not to print information found in codestream.

hi - Reference to the HeaderInfo instance.

Throws:

IOException - If an I/O error occurs while reading initial data from the bit stream.

IllegalArgumentException - If an unrecognised bit stream reader option is present.

getParameterInfo

public static String[][] getParameterInfo()

Returns the parameters that are used in this class and implementing classes. It returns a 2D String array. Each of the 1D arrays is for a different option, and they have 3 elements. The first element is the option name, the second one is the synopsis and the third one is a long description of what the parameter is. The synopsis or description may be 'null', in which case it is assumed that there is no synopsis or description of the option, respectively. Null may be returned if no options are supported.

Returns:

the options name, their synopsis and their explanation, or null if no options are supported.

getPPX

public final int getPPX(int t,
         int c,
         int rl)

Returns the precinct partition width for the specified tile-component and (tile-component) resolution level.

Parameters:

t - the tile index

c - The index of the component (between 0 and N-1)

rl - The resolution level, from 0 to L.

Returns:

the precinct partition width for the specified component, resolution level and tile.

getPPY

public final int getPPY(int t,
         int c,
         int rl)

Returns the precinct partition height for the specified tile-component and (tile-component) resolution level.

Parameters:

t - The tile index

c - The index of the component (between 0 and N-1)

rl - The resolution level, from 0 to L.

Returns:

The precinct partition height in the specified component, for the specified resolution level, for the current tile.

initSubbandsFields

protected void initSubbandsFields(int c,
                      SubbandSyn sb)

Initialises subbands fields, such as code-blocks dimension and number of magnitude bits, in the subband tree. The nominal code-block width/height depends on the precincts dimensions if used. The way the number of magnitude bits is computed depends on the quantization type (reversible, derived, expounded).

Parameters:

c - The component index

sb - The subband tree to be initialised.

getImgRes

public int getImgRes()

Returns the image resolution level to reconstruct from the codestream. This value cannot be computed before every main and tile headers are read.

Returns:

The image resolution level

getTargetRate

public float getTargetRate()

Return the target decoding rate in bits per pixel.

Returns:

Target decoding rate in bpp.

getActualRate

public float getActualRate()

Return the actual decoding rate in bits per pixel.

Returns:

Actual decoding rate in bpp.

getTargetNbytes

public int getTargetNbytes()

Return the target number of read bytes.

Returns:

Target decoding rate in bytes.

getActualNbytes

public int getActualNbytes()

Return the actual number of read bytes.

Returns:

Actual decoding rate in bytes.

getTilePartULX

public int getTilePartULX()

Returns the horizontal offset of tile partition

Specified by:

getTilePartULX in interface MultiResImgData

getTilePartULY

public int getTilePartULY()

Returns the vertical offset of tile partition

Specified by:

getTilePartULY in interface MultiResImgData

getNomTileWidth

public int getNomTileWidth()

Returns the nominal tile width

Specified by:

getNomTileWidth in interface MultiResImgData

getNomTileHeight

public int getNomTileHeight()

Returns the nominal tile height

Specified by:

getNomTileHeight in interface MultiResImgData