|
||||||||||
PREV CLASS NEXT CLASS | FRAMES NO FRAMES | |||||||||
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD |
java.lang.Objectucar.jpeg.jj2000.j2k.image.ImgDataAdapter
ucar.jpeg.jj2000.j2k.image.forwcomptransf.ForwCompTransf
public class ForwCompTransf
This class apply component transformations to the tiles depending on user specifications. These transformations can be used to improve compression efficiency but are not related to colour transforms used to map colour values for display purposes. JPEG 2000 part I defines 2 component transformations: RCT (Reversible Component Transformation) and ICT (Irreversible Component Transformation).
ModuleSpec
Field Summary | |
---|---|
static int |
FORW_ICT
Identifier for the Forward Irreversible Component Transformation (FORW_ICT). |
static int |
FORW_RCT
Identifier for the Forward Reversible Component Transformation (FORW_RCT). |
static int |
NONE
Identifier for no component transformation. |
static char |
OPT_PREFIX
The prefix for component transformation type: 'M' |
Fields inherited from class ucar.jpeg.jj2000.j2k.image.ImgDataAdapter |
---|
imgdatasrc, tIdx |
Constructor Summary | |
---|---|
ForwCompTransf(BlkImgDataSrc imgSrc,
EncoderSpecs encSpec)
Constructs a new ForwCompTransf object that operates on the specified source of image data. |
Method Summary | |
---|---|
static int[] |
calcMixedBitDepths(int[] ntdepth,
int ttype,
int[] tdepth)
Calculates the bitdepths of the transformed components, given the bitdepth of the un-transformed components and the component transformation type. |
DataBlk |
getCompData(DataBlk blk,
int c)
Apply forward component transformation associated with the current tile. |
int |
getFixedPoint(int c)
Returns the position of the fixed point in the specified component. |
DataBlk |
getInternCompData(DataBlk blk,
int c)
Apply the component transformation associated with the current tile. |
int |
getNomRangeBits(int c)
Returns the number of bits, referred to as the "range bits", corresponding to the nominal range of the data in the specified component and in the current tile. |
static String[][] |
getParameterInfo()
Returns the parameters that are used in this class and implementing classes. |
boolean |
isReversible()
Returns true if this transform is reversible in current tile. |
void |
nextTile()
Goes to the next tile, in standard scan-line order (by rows then by columns). |
void |
setTile(int x,
int y)
Changes the current tile, given the new indexes. |
String |
toString()
Returns a string with a descriptive text of which forward component transformation is used. |
Methods inherited from class ucar.jpeg.jj2000.j2k.image.ImgDataAdapter |
---|
getCompImgHeight, getCompImgWidth, getCompSubsX, getCompSubsY, getCompULX, getCompULY, getImgHeight, getImgULX, getImgULY, getImgWidth, getNomTileHeight, getNomTileWidth, getNumComps, getNumTiles, getNumTiles, getTile, getTileCompHeight, getTileCompWidth, getTileHeight, getTileIdx, getTilePartULX, getTilePartULY, getTileWidth |
Methods inherited from class java.lang.Object |
---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Methods inherited from interface ucar.jpeg.jj2000.j2k.image.ImgData |
---|
getCompImgHeight, getCompImgWidth, getCompSubsX, getCompSubsY, getCompULX, getCompULY, getImgHeight, getImgULX, getImgULY, getImgWidth, getNomTileHeight, getNomTileWidth, getNumComps, getNumTiles, getNumTiles, getTile, getTileCompHeight, getTileCompWidth, getTileHeight, getTileIdx, getTilePartULX, getTilePartULY, getTileWidth |
Field Detail |
---|
public static final int NONE
public static final int FORW_RCT
public static final int FORW_ICT
public static final char OPT_PREFIX
Constructor Detail |
---|
public ForwCompTransf(BlkImgDataSrc imgSrc, EncoderSpecs encSpec)
imgSrc
- The source from where to get the data to be transformedencSpec
- The encoder specificationsBlkImgDataSrc
Method Detail |
---|
public int getFixedPoint(int c)
This default implementation assumes that the number of fractional bits is not modified by the component mixer.
getFixedPoint
in interface BlkImgDataSrc
c
- The index of the component.
public static String[][] getParameterInfo()
public static int[] calcMixedBitDepths(int[] ntdepth, int ttype, int[] tdepth)
ntdepth
- The bitdepth of each non-transformed components.ttype
- The type ID of the component transformation.tdepth
- If not null the results are stored in this array,
otherwise a new array is allocated and returned.
public String toString()
toString
in class Object
public int getNomRangeBits(int c)
getNomRangeBits
in interface ImgData
getNomRangeBits
in class ImgDataAdapter
c
- The index of the component.
public boolean isReversible()
public DataBlk getCompData(DataBlk blk, int c)
This method calls the getInternCompData() method, but respects the definitions of the getCompData() method defined in the BlkImgDataSrc interface.
getCompData
in interface BlkImgDataSrc
blk
- Determines the rectangular area to return, and the data is
returned in this object.c
- Index of the output component.
BlkImgDataSrc.getCompData(ucar.jpeg.jj2000.j2k.image.DataBlk, int)
public DataBlk getInternCompData(DataBlk blk, int c)
getInternCompData
in interface BlkImgDataSrc
blk
- Determines the rectangular area to return.c
- Index of the output component.
forwRCT(ucar.jpeg.jj2000.j2k.image.DataBlk, int)
,
forwICT(ucar.jpeg.jj2000.j2k.image.DataBlk, int)
public void setTile(int x, int y)
This default implementation changes the tile in the source and re-initializes properly component transformation variables..
setTile
in interface ImgData
setTile
in class ImgDataAdapter
x
- The horizontal index of the tile.y
- The vertical index of the new tile.public void nextTile()
This default implementation just advances to the next tile in the source and re-initializes properly component transformation variables.
nextTile
in interface ImgData
nextTile
in class ImgDataAdapter
|
||||||||||
PREV CLASS NEXT CLASS | FRAMES NO FRAMES | |||||||||
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD |