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java.lang.Objectucar.jpeg.jj2000.j2k.roi.encoder.ROIMaskGenerator
ucar.jpeg.jj2000.j2k.roi.encoder.ArbROIMaskGenerator
public class ArbROIMaskGenerator
This class generates the ROI bit-mask when, at least, one ROI is not rectangular. In this case, the fast ROI bit-mask algorithm generation can not be used.
The values are calculated from the scaling factors of the ROIs. The values with which to scale are equal to u-umin where umin is the lowest scaling factor within the block. The umin value is sent to the entropy coder to be used for scaling the distortion values.
ROIMaskGenerator
,
ArbROIMaskGenerator
Field Summary |
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Fields inherited from class ucar.jpeg.jj2000.j2k.roi.encoder.ROIMaskGenerator |
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nrc, rois, tileMaskMade |
Constructor Summary | |
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ArbROIMaskGenerator(ROI[] rois,
int nrc,
Quantizer src)
The constructor of the arbitrary mask generator |
Method Summary | |
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boolean |
getROIMask(DataBlkInt db,
Subband sb,
int magbits,
int c)
This functions gets a DataBlk the size of the current code-block an fills this block with the ROI mask. |
void |
makeMask(Subband sb,
int magbits,
int c)
This function generates the ROI mask for one tile-component. |
String |
toString()
This function returns the relevant data of the mask generator |
Methods inherited from class ucar.jpeg.jj2000.j2k.roi.encoder.ROIMaskGenerator |
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getROIs, tileChanged |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Constructor Detail |
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public ArbROIMaskGenerator(ROI[] rois, int nrc, Quantizer src)
rois
- The ROI info.nrc
- The number of componentssrc
- The quantizer moduleMethod Detail |
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public boolean getROIMask(DataBlkInt db, Subband sb, int magbits, int c)
In order to get the mask for a particular Subband, the subband tree is traversed and at each decomposition, the ROI masks are computed.
The widths of the synthesis filters corresponding to the wavelet filters used in the wavelet transform are used to expand the ROI masks in the decompositions.
getROIMask
in class ROIMaskGenerator
db
- The data block that is to be filled with the masksb
- The root of the subband tree to which db belongsmagbits
- The max number of magnitude bits in any code-blockc
- The number of the component
public String toString()
toString
in class Object
public void makeMask(Subband sb, int magbits, int c)
Once the mask is generated in the pixel domain. it is decomposed following the same decomposition scheme as the wavelet transform.
makeMask
in class ROIMaskGenerator
sb
- The root of the subband tree used in the decompositionmagbits
- The max number of magnitude bits in any code-blockc
- component number
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