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:
  • Constructor Details

    • 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 Details

    • 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