jj2000.j2k.image
Interface ImgData

All Known Subinterfaces:

BlkImgDataSrc, CBlkQuantDataSrcEnc, CBlkWTDataSrc, CodedCBlkDataSrcEnc, ForwWT, ForwWTDataProps, InvWT, WaveletTransform

All Known Implementing Classes:

ColorSpaceMapper, EntropyCoder, ForwardWT, ForwCompTransf, ImgDataAdapter, ImgDataConverter, ImgDataJoiner, ImgReader, InvCompTransf, InverseWT, InvWTAdapter, Quantizer, ROIScaler, Tiler

public interface ImgData

This interface defines methods to access image attributes (width, height, number of components, etc.). The image can be tiled or not (i.e. if the image is not tiled then there is only 1 tile). It should be implemented by all classes that provide image data, such as image file readers, color transforms, wavelet transforms, etc. This interface, however, does not define methods to transfer image data (i.e. pixel data), that is defined by other interfaces, such as 'BlkImgDataSrc'.

See Also:

BlkImgDataSrc

Method Summary

int	getCompImgHeight(int c) Returns the height in pixels of the specified component in the overall image.
int	getCompImgWidth(int c) Returns the width in pixels of the specified component in the overall image.
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	getCompULX(int c) Returns the horizontal coordinate of the upper-left corner of the specified component in the current tile.
int	getCompULY(int c) Returns the vertical coordinate of the upper-left corner of the specified component in the current tile.
int	getImgHeight() Returns the overall height of the image in pixels.
int	getImgULX() Returns the horizontal coordinate of the image origin, the top-left corner, in the canvas system, on the reference grid.
int	getImgULY() Returns the vertical coordinate of the image origin, the top-left corner, in the canvas system, on the reference grid.
int	getImgWidth() Returns the overall width of the image in pixels.
int	getNomRangeBits(int c) Returns the number of bits, referred to as the "range bits", corresponding to the nominal range of the image data in the specified component.
int	getNomTileHeight() Returns the nominal tiles height
int	getNomTileWidth() Returns the nominal tiles width
int	getNumComps() Returns the number of components in the image.
int	getNumTiles() Returns the total number of tiles in the image.
Coord	getNumTiles(Coord co) Returns the number of tiles in the horizontal and vertical directions.
Coord	getTile(Coord co) Returns the indixes of the current tile.
int	getTileCompHeight(int t, int c) Returns the height in pixels of the specified tile-component.
int	getTileCompWidth(int t, int c) Returns the width in pixels of the specified tile-component
int	getTileHeight() Returns the overall height of the current tile in pixels.
int	getTileIdx() Returns the index of the current tile, relative to a standard scan-line order.
int	getTilePartULX() Returns the horizontal tile partition offset in the reference grid
int	getTilePartULY() Returns the vertical tile partition offset in the reference grid
int	getTileWidth() Returns the overall width of the current tile in pixels.
void	nextTile() Advances to the next tile, in standard scan-line order (by rows then columns).
void	setTile(int x, int y) Changes the current tile, given the new indices.

Method Detail

getTileWidth

public int getTileWidth()

Returns the overall width of the current tile in pixels. This is the tile's width without accounting for any component subsampling. This is also referred as the reference grid width in the current tile.

Returns:

The total current tile's width in pixels.

getTileHeight

public int getTileHeight()

Returns the overall height of the current tile in pixels. This is the tile's height without accounting for any component subsampling. This is also referred as the reference grid height in the current tile.

Returns:

The total current tile's height in pixels.

getNomTileWidth

public int getNomTileWidth()

Returns the nominal tiles width

getNomTileHeight

public int getNomTileHeight()

Returns the nominal tiles height

getImgWidth

public int getImgWidth()

Returns the overall width of the image in pixels. This is the image's width without accounting for any component subsampling or tiling.

Returns:

The total image's width in pixels.

getImgHeight

public int getImgHeight()

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

Returns:

The total image's height in pixels.

getNumComps

public int getNumComps()

Returns the number of components in the image.

Returns:

The number of components in the image.

getCompSubsX

public 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.

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.

Parameters:

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

Returns:

The vertical subsampling factor of component 'c'

See Also:

ImgData

getTileCompWidth

public int getTileCompWidth(int t,
                            int c)

Returns the width in pixels of the specified tile-component

Parameters:

t - Tile index

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

Returns:

The width in pixels of component c in tilet.

getTileCompHeight

public int getTileCompHeight(int t,
                             int c)

Returns the height in pixels of the specified tile-component.

Parameters:

t - The tile index.

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

Returns:

The height in pixels of component c in tile t.

getCompImgWidth

public int getCompImgWidth(int c)

Returns the width in pixels of the specified component in the overall image.

Parameters:

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

Returns:

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

getCompImgHeight

public int getCompImgHeight(int c)

Returns the height in pixels of the specified component in the overall image.

Parameters:

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

Returns:

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

getNomRangeBits

public int getNomRangeBits(int c)

Returns the number of bits, referred to as the "range bits", corresponding to the nominal range of the image data in the specified component. If this number is n then for unsigned data the nominal range is between 0 and 2^b-1, and for signed data it is between -2^(b-1) and 2^(b-1)-1. In the case of transformed data which is not in the image domain (e.g., wavelet coefficients), this method returns the "range bits" of the image data that generated the coefficients.

Parameters:

c - The index of the component.

Returns:

The number of bits corresponding to the nominal range of the image data (in the image domain).

setTile

public void setTile(int x,
                    int y)

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

Parameters:

x - The horizontal index of the tile.

y - The vertical index of the new tile.

nextTile

public 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).

getTile

public Coord getTile(Coord co)

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

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 indices (vertical and horizontal indexes).

getTileIdx

public int getTileIdx()

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

Returns:

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

getTilePartULX

public int getTilePartULX()

Returns the horizontal tile partition offset in the reference grid

getTilePartULY

public int getTilePartULY()

Returns the vertical tile partition offset in the reference grid

getCompULX

public int getCompULX(int c)

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

Parameters:

c - The index of the component.

getCompULY

public int getCompULY(int c)

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

Parameters:

c - The index of the component.

getImgULX

public int getImgULX()

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

Returns:

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

getImgULY

public int getImgULY()

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

Returns:

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

getNumTiles

public Coord getNumTiles(Coord co)

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

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 (Coord.x) and vertical (Coord.y) directions.

getNumTiles

public int getNumTiles()

Returns the total number of tiles in the image.

Returns:

The total number of tiles in the image.