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java.lang.Object | +--jj2000.j2k.wavelet.synthesis.MultiResImgDataAdapter | +--jj2000.j2k.roi.ROIDeScaler
This class takes care of the de-scaling of ROI coefficients. The de-scaler works on a tile basis and any mask that is generated is for the current mask only
Default implementations of the methods in 'MultiResImgData' are provided through the 'MultiResImgDataAdapter' abstract class.
Sign magnitude representation is used (instead of two's complement) for the output data. The most significant bit is used for the sign (0 if positive, 1 if negative). Then the magnitude of the quantized coefficient is stored in the next most significat bits. The most significant magnitude bit corresponds to the most significant bit-plane and so on.
Field Summary | |
private MaxShiftSpec |
mss
The MaxShiftSpec containing the scaling values for all tile-components |
static char |
OPT_PREFIX
The prefix for ROI decoder options: 'R' |
private static java.lang.String[][] |
pinfo
The list of parameters that is accepted by the entropy decoders. |
private CBlkQuantDataSrcDec |
src
The entropy decoder from where to get the compressed data (the source) |
Fields inherited from class jj2000.j2k.wavelet.synthesis.MultiResImgDataAdapter |
mressrc,
tIdx |
Constructor Summary | |
ROIDeScaler(CBlkQuantDataSrcDec src,
MaxShiftSpec mss)
Constructor of the ROI descaler, takes EntropyDEcoder as source of data to de-scale. |
Method Summary | |
static ROIDeScaler |
createInstance(CBlkQuantDataSrcDec src,
ParameterList pl,
DecoderSpecs decSpec)
Creates a ROIDeScaler object. |
DataBlk |
getCodeBlock(int c,
int m,
int n,
SubbandSyn sb,
DataBlk cblk)
Returns the specified code-block in the current tile for the specified component, as a copy (see below). |
DataBlk |
getInternCodeBlock(int c,
int m,
int n,
SubbandSyn sb,
DataBlk cblk)
Returns the specified code-block in the current tile for the specified component (as a reference or copy). |
Coord |
getNumCodeBlocks(SubbandSyn sb,
int n,
Coord co)
Returns the number of code-blocks in a subband, along the horizontal and vertical dimensions. |
static java.lang.String[][] |
getParameterInfo()
Returns the parameters that are used in this class and implementing classes. |
int |
getPartitionULX()
Returns the horizontal coordinate of the origin of the cell and code-block partition, with respect to the canvas origin, on the reference grid. |
int |
getPartitionULY()
Returns the vertical coordinate of the origin of the cell and code-block partition, with respect to the canvas origin, on the reference grid. |
SubbandSyn |
getSubbandTree(int t,
int c)
Returns the subband tree, for the specified tile-component. |
Methods inherited from class jj2000.j2k.wavelet.synthesis.MultiResImgDataAdapter |
getCompHeight,
getCompImgHeight,
getCompImgWidth,
getCompSubsX,
getCompSubsY,
getCompWidth,
getHeight,
getImgHeight,
getImgULX,
getImgULY,
getImgWidth,
getNumComps,
getNumTiles,
getNumTiles,
getTile,
getTileIdx,
getTileOff,
getULX,
getULY,
getWidth,
nextTile,
setTile |
Methods inherited from class java.lang.Object |
|
Field Detail |
private MaxShiftSpec mss
public static final char OPT_PREFIX
private static final java.lang.String[][] pinfo
private CBlkQuantDataSrcDec src
Constructor Detail |
public ROIDeScaler(CBlkQuantDataSrcDec src, MaxShiftSpec mss)
src
- The EntropyDecoder that is the source of data.mss
- The MaxShiftSpec containing the scaling values for all
tile-componentsMethod Detail |
public SubbandSyn getSubbandTree(int t, int c)
The number of magnitude bits ('magBits' member variable) for each subband is not initialized.
t
- The index of the tile, from 0 to T-1.c
- The index of the component, from 0 to C-1.public int getPartitionULX()
public int getPartitionULY()
public static java.lang.String[][] getParameterInfo()
public Coord getNumCodeBlocks(SubbandSyn sb, int n, Coord co)
sb
- The subband for which to return the number of blocks.n
- The component where the subband is.co
- If not null the values are returned in this object. If null a
new object is allocated and returned.public DataBlk getCodeBlock(int c, int m, int n, SubbandSyn sb, DataBlk cblk)
The returned code-block may be progressive, which is indicated by the 'progressive' variable of the returned 'DataBlk' object. If a code-block is progressive it means that in a later request to this method for the same code-block it is possible to retrieve data which is a better approximation, since meanwhile more data to decode for the code-block could have been received. If the code-block is not progressive then later calls to this method for the same code-block will return the exact same data values.
The data returned by this method is always a copy of the internal data of this object, if any, and it can be modified "in place" without any problems after being returned. The 'offset' of the returned data is 0, and the 'scanw' is the same as the code-block width. See the 'DataBlk' class.
The 'ulx' and 'uly' members of the returned 'DataBlk' object contain the coordinates of the top-left corner of the block, with respect to the tile, not the subband.
c
- The component for which to return the next code-block.m
- The vertical index of the code-block to return, in the
specified subband.n
- The horizontal index of the code-block to return, in the
specified subband.sb
- The subband in which the code-block to return is.cblk
- If non-null this object will be used to return the new
code-block. If null a new one will be allocated and returned. If the
"data" array of the object is non-null it will be reused, if possible,
to return the data.DataBlk
public DataBlk getInternCodeBlock(int c, int m, int n, SubbandSyn sb, DataBlk cblk)
The returned code-block may be progressive, which is indicated by the 'progressive' variable of the returned 'DataBlk' object. If a code-block is progressive it means that in a later request to this method for the same code-block it is possible to retrieve data which is a better approximation, since meanwhile more data to decode for the code-block could have been received. If the code-block is not progressive then later calls to this method for the same code-block will return the exact same data values.
The data returned by this method can be the data in the internal buffer of this object, if any, and thus can not be modified by the caller. The 'offset' and 'scanw' of the returned data can be arbitrary. See the 'DataBlk' class.
The 'ulx' and 'uly' members of the returned 'DataBlk' object contain the coordinates of the top-left corner of the block, with respect to the tile, not the subband.
c
- The component for which to return the next code-block.m
- The vertical index of the code-block to return, in the
specified subband.n
- The horizontal index of the code-block to return, in the
specified subband.sb
- The subband in which the code-block to return is.cblk
- If non-null this object will be used to return the new
code-block. If null a new one will be allocated and returned. If the
"data" array of the object is non-null it will be reused, if possible,
to return the data.DataBlk
public static ROIDeScaler createInstance(CBlkQuantDataSrcDec src, ParameterList pl, DecoderSpecs decSpec)
src
- The source of data that is to be descaledpl
- The parameter list (or options).decSpec
- The decoding specifications
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