Package jj2000.j2k.roi.encoder
Class ArbROIMaskGenerator
java.lang.Object
jj2000.j2k.roi.encoder.ROIMaskGenerator
jj2000.j2k.roi.encoder.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.
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Field Summary
Fields inherited from class jj2000.j2k.roi.encoder.ROIMaskGenerator
nrc, rois, tileMaskMade -
Constructor Summary
ConstructorsConstructorDescriptionArbROIMaskGenerator(ROI[] rois, int nrc, Quantizer src) The constructor of the arbitrary mask generator -
Method Summary
Modifier and TypeMethodDescriptionbooleangetROIMask(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.voidThis function generates the ROI mask for one tile-component.toString()This function returns the relevant data of the mask generatorMethods inherited from class jj2000.j2k.roi.encoder.ROIMaskGenerator
getROIs, tileChanged
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Constructor Details
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ArbROIMaskGenerator
The constructor of the arbitrary mask generator- Parameters:
rois- The ROI info.nrc- The number of componentssrc- The quantizer module
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Method Details
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getROIMask
This functions gets a DataBlk the size of the current code-block an fills this block with the ROI mask.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.
- Specified by:
getROIMaskin classROIMaskGenerator- Parameters:
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- Returns:
- Whether or not a mask was needed for this tile
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toString
This function returns the relevant data of the mask generator -
makeMask
This function generates the ROI mask for one tile-component.Once the mask is generated in the pixel domain. it is decomposed following the same decomposition scheme as the wavelet transform.
- Specified by:
makeMaskin classROIMaskGenerator- Parameters:
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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