jj2000.j2k.roi.encoder

Class ArbROIMaskGenerator

java.lang.Object

jj2000.j2k.roi.encoder.ROIMaskGenerator

jj2000.j2k.roi.encoder.ArbROIMaskGenerator

public class ArbROIMaskGenerator
extends ROIMaskGenerator

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.

See Also:

ROIMaskGenerator, ArbROIMaskGenerator

Field Summary

Fields

Modifier and Type	Field and Description
private int[]	maskLineHigh The High frequency part of a mask line
private int[]	maskLineLow The low frequency part of a mask line
private int[]	paddedMaskLine A line or column of the mask with padding
private boolean	roiInTile Flag indicating if any ROI was found to be in this tile
private int[][]	roiMask The ROI mask for the current tile for all components
private Quantizer	src The source of quantized wavelet transform coefficients

Fields inherited from class jj2000.j2k.roi.encoder.ROIMaskGenerator

nrc, rois, tileMaskMade

Constructor Summary

Constructors

Constructor and Description
ArbROIMaskGenerator(ROI[] rois, int nrc, Quantizer src) The constructor of the arbitrary mask generator

Method Summary

Modifier and Type	Method and Description
private void	decomp(Subband sb, int tilew, int tileh, int c) This function decomposes the mask for a node in the subband tree.
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 jj2000.j2k.roi.encoder.ROIMaskGenerator

getROIs, tileChanged

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

src

private Quantizer src

The source of quantized wavelet transform coefficients

roiMask

private int[][] roiMask

The ROI mask for the current tile for all components

maskLineLow

private int[] maskLineLow

The low frequency part of a mask line

maskLineHigh

private int[] maskLineHigh

The High frequency part of a mask line

paddedMaskLine

private int[] paddedMaskLine

A line or column of the mask with padding

roiInTile

private boolean roiInTile

Flag indicating if any ROI was found to be in this tile

Constructor Detail

ArbROIMaskGenerator

public ArbROIMaskGenerator(ROI[] rois,
                           int nrc,
                           Quantizer src)

The constructor of the arbitrary mask generator

Parameters:

rois - The ROI info.

nrc - The number of components

src - The quantizer module

Method Detail

getROIMask

public 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.

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:

getROIMask in class ROIMaskGenerator

Parameters:

db - The data block that is to be filled with the mask

sb - The root of the subband tree to which db belongs

magbits - The max number of magnitude bits in any code-block

c - The number of the component

Returns:

Whether or not a mask was needed for this tile

toString

public String toString()

This function returns the relevant data of the mask generator

Overrides:

toString in class Object

makeMask

public void makeMask(Subband sb,
                     int magbits,
                     int c)

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:

makeMask in class ROIMaskGenerator

Parameters:

sb - The root of the subband tree used in the decomposition

magbits - The max number of magnitude bits in any code-block

c - component number

decomp

private void decomp(Subband sb,
                    int tilew,
                    int tileh,
                    int c)

This function decomposes the mask for a node in the subband tree. after the mask is decomposed for a node, this function is called for the children of the subband. The decomposition is done line by line and column by column

Parameters:

sb - The subband that is to be used for the decomposition

tilew - The width of the current tile

tileh - The height of the current tile

c - component number