jj2000.j2k.quantization.dequantizer.CBlkQuantDataSrcDec Maven / Gradle / Ivy
Show all versions of jai-imageio-jpeg2000 Show documentation
/*
* $RCSfile: CBlkQuantDataSrcDec.java,v $
* $Revision: 1.1 $
* $Date: 2005/02/11 05:02:18 $
* $State: Exp $
*
* Class: CBlkQuantDataSrcDec
*
* Description: Interface that defines a source of
* quantized wavelet data to be transferred in a
* code-block by code-block basis (decoder side).
*
*
*
* COPYRIGHT:
*
* This software module was originally developed by Raphaël Grosbois and
* Diego Santa Cruz (Swiss Federal Institute of Technology-EPFL); Joel
* Askelöf (Ericsson Radio Systems AB); and Bertrand Berthelot, David
* Bouchard, Félix Henry, Gerard Mozelle and Patrice Onno (Canon Research
* Centre France S.A) in the course of development of the JPEG2000
* standard as specified by ISO/IEC 15444 (JPEG 2000 Standard). This
* software module is an implementation of a part of the JPEG 2000
* Standard. Swiss Federal Institute of Technology-EPFL, Ericsson Radio
* Systems AB and Canon Research Centre France S.A (collectively JJ2000
* Partners) agree not to assert against ISO/IEC and users of the JPEG
* 2000 Standard (Users) any of their rights under the copyright, not
* including other intellectual property rights, for this software module
* with respect to the usage by ISO/IEC and Users of this software module
* or modifications thereof for use in hardware or software products
* claiming conformance to the JPEG 2000 Standard. Those intending to use
* this software module in hardware or software products are advised that
* their use may infringe existing patents. The original developers of
* this software module, JJ2000 Partners and ISO/IEC assume no liability
* for use of this software module or modifications thereof. No license
* or right to this software module is granted for non JPEG 2000 Standard
* conforming products. JJ2000 Partners have full right to use this
* software module for his/her own purpose, assign or donate this
* software module to any third party and to inhibit third parties from
* using this software module for non JPEG 2000 Standard conforming
* products. This copyright notice must be included in all copies or
* derivative works of this software module.
*
* Copyright (c) 1999/2000 JJ2000 Partners.
* */
package jj2000.j2k.quantization.dequantizer;
import jj2000.j2k.entropy.decoder.EntropyDecoder;
import jj2000.j2k.image.DataBlk;
import jj2000.j2k.wavelet.synthesis.CBlkWTDataSrcDec;
import jj2000.j2k.wavelet.synthesis.InvWTData;
import jj2000.j2k.wavelet.synthesis.SubbandSyn;
/**
* This interface defines a source of quantized wavelet coefficients and
* methods to transfer them in a code-block by code-block basis, fro the
* decoder side. In each call to 'getCodeBlock()' or 'getInternCodeBlock()' a
* new code-block is returned.
*
* This class is the source of data for the dequantizer. See the
* 'Dequantizer' class.
*
*
Code-block data is returned in sign-magnitude representation, instead of
* the normal two's complement one. Only integral types are used. The sign
* magnitude representation is more adequate for entropy coding. In sign
* magnitude representation, the most significant bit is used for the sign (0
* if positive, 1 if negative) and the magnitude of the coefficient is stored
* in the next M most significant bits. The rest of the bits (least
* significant bits) can contain a fractional value of the quantized
* coefficient. The number 'M' of magnitude bits is communicated in the
* 'magbits' member variable of the 'CBlkWTData'.
*
* @see InvWTData
* @see CBlkWTDataSrcDec
* @see Dequantizer
* @see EntropyDecoder
* */
public interface CBlkQuantDataSrcDec extends InvWTData {
/**
* Returns the specified code-block in the current tile for the specified
* component, as a copy (see below).
*
*
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.
*
* @param c The component for which to return the next code-block.
*
* @param m The vertical index of the code-block to return, in the
* specified subband.
*
* @param n The horizontal index of the code-block to return, in the
* specified subband.
*
* @param sb The subband in which the code-block to return is.
*
* @param 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.
*
* @return The next code-block in the current tile for component 'n', or
* null if all code-blocks for the current tile have been returned.
*
* @see DataBlk
* */
public 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 reference or copy).
*
* 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.
*
* @param c The component for which to return the next code-block.
*
* @param m The vertical index of the code-block to return, in the
* specified subband.
*
* @param n The horizontal index of the code-block to return, in the
* specified subband.
*
* @param sb The subband in which the code-block to return is.
*
* @param 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.
*
* @return The next code-block in the current tile for component 'n', or
* null if all code-blocks for the current tile have been returned.
*
* @see DataBlk
* */
public DataBlk getInternCodeBlock(int c,int m,int n,SubbandSyn sb,
DataBlk cblk);
}