corrade-vassal – Rev 1
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/*
* CVS identifier:
*
* $Id: Dequantizer.java,v 1.37 2001/10/29 20:07:28 qtxjoas Exp $
*
* Class: Dequantizer
*
* Description: The abstract class for all dequantizers.
*
*
*
* 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.
* */
using System;
using CSJ2K.j2k.image.invcomptransf;
using CSJ2K.j2k.wavelet.synthesis;
using CSJ2K.j2k.entropy.decoder;
using CSJ2K.j2k.codestream;
using CSJ2K.j2k.entropy;
using CSJ2K.j2k.decoder;
using CSJ2K.j2k.wavelet;
using CSJ2K.j2k.image;
using CSJ2K.j2k.io;
using CSJ2K.j2k;
namespace CSJ2K.j2k.quantization.dequantizer
{
/// <summary> This is the abstract class from which all dequantizers must inherit. This
/// class has the concept of a current tile and all operations are performed on
/// the current tile.
///
/// <p>This class provides default implemenations for most of the methods
/// (wherever it makes sense), under the assumption that the image and
/// component dimensions, and the tiles, are not modifed by the dequantizer. If
/// that is not the case for a particular implementation then the methods
/// should be overriden.</p>
///
/// <p>Sign magnitude representation is used (instead of two's complement) for
/// the input data. The most significant bit is used for the sign (0 if
/// positive, 1 if negative). Then the magnitude of the quantized coefficient
/// is stored in the next most significat bits. The most significant magnitude
/// bit corresponds to the most significant bit-plane and so on.</p>
///
/// <p>The output data is either in floating-point, or in fixed-point two's
/// complement. In case of floating-point data the the value returned by
/// getFixedPoint() must be 0. If the case of fixed-point data the number of
/// fractional bits must be defined at the constructor of the implementing
/// class and all operations must be performed accordingly. Each component may
/// have a different number of fractional bits.</p>
///
/// </summary>
public abstract class Dequantizer:MultiResImgDataAdapter, CBlkWTDataSrcDec
{
/// <summary> Returns the horizontal code-block partition origin. Allowable values
/// are 0 and 1, nothing else.
///
/// </summary>
virtual public int CbULX
{
get
{
return src.CbULX;
}
}
/// <summary> Returns the vertical code-block partition origin. Allowable values are
/// 0 and 1, nothing else.
///
/// </summary>
virtual public int CbULY
{
get
{
return src.CbULY;
}
}
/// <summary> Returns the parameters that are used in this class and
/// implementing classes. It returns a 2D String array. Each of the
/// 1D arrays is for a different option, and they have 3
/// elements. The first element is the option name, the second one
/// is the synopsis and the third one is a long description of what
/// the parameter is. The synopsis or description may be 'null', in
/// which case it is assumed that there is no synopsis or
/// description of the option, respectively. Null may be returned
/// if no options are supported.
///
/// </summary>
/// <returns> the options name, their synopsis and their explanation,
/// or null if no options are supported.
///
/// </returns>
public static System.String[][] ParameterInfo
{
get
{
return pinfo;
}
}
/// <summary>The prefix for dequantizer options: 'Q' </summary>
public const char OPT_PREFIX = 'Q';
/// <summary>The list of parameters that is accepted by the bit stream
/// readers. They start with 'Q'
/// </summary>
//UPGRADE_NOTE: Final was removed from the declaration of 'pinfo'. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1003'"
private static readonly System.String[][] pinfo = null;
/// <summary>The entropy decoder from where to get the quantized data (the
/// source).
/// </summary>
protected internal CBlkQuantDataSrcDec src;
/// <summary>The "range bits" for each transformed component </summary>
protected internal int[] rb = null;
/// <summary>The "range bits" for each un-transformed component </summary>
protected internal int[] utrb = null;
/// <summary>The inverse component transformation specifications </summary>
private CompTransfSpec cts;
/// <summary>Reference to the wavelet filter specifications </summary>
private SynWTFilterSpec wfs;
/// <summary> Initializes the source of compressed data.
///
/// </summary>
/// <param name="src">From where to obtain the quantized data.
///
/// </param>
/// <param name="rb">The number of "range bits" for each component (must be the
/// "range bits" of the un-transformed components. For a definition of
/// "range bits" see the getNomRangeBits() method.
///
/// </param>
/// <seealso cref="getNomRangeBits">
///
/// </seealso>
public Dequantizer(CBlkQuantDataSrcDec src, int[] utrb, DecoderSpecs decSpec):base(src)
{
if (utrb.Length != src.NumComps)
{
throw new System.ArgumentException();
}
this.src = src;
this.utrb = utrb;
this.cts = decSpec.cts;
this.wfs = decSpec.wfs;
}
/// <summary> Returns the number of bits, referred to as the "range bits",
/// corresponding to the nominal range of the data in the specified
/// component.
///
/// <p>The returned value corresponds to the nominal dynamic range of the
/// reconstructed image data, not of the wavelet coefficients
/// themselves. This is because different subbands have different gains and
/// thus different nominal ranges. To have an idea of the nominal range in
/// each subband the subband analysis gain value from the subband tree
/// structure, returned by the getSynSubbandTree() method, can be used. See
/// the Subband class for more details.</p>
///
/// <p>If this number is <i>b</b> then for unsigned data the nominal range
/// is between 0 and 2^b-1, and for signed data it is between -2^(b-1) and
/// 2^(b-1)-1.</p>
///
/// </summary>
/// <param name="c">The index of the component
///
/// </param>
/// <returns> The number of bits corresponding to the nominal range of the
/// data.
///
/// </returns>
/// <seealso cref="Subband">
///
/// </seealso>
public virtual int getNomRangeBits(int c)
{
return rb[c];
}
/// <summary> Returns the subband tree, for the specified tile-component. This method
/// returns the root element of the subband tree structure, see Subband and
/// SubbandSyn. The tree comprises all the available resolution levels.
///
/// <P>The number of magnitude bits ('magBits' member variable) for each
/// subband may have not been not initialized (it depends on the actual
/// dequantizer and its implementation). However, they are not necessary
/// for the subsequent steps in the decoder chain.
///
/// </summary>
/// <param name="t">The index of the tile, from 0 to T-1.
///
/// </param>
/// <param name="c">The index of the component, from 0 to C-1.
///
/// </param>
/// <returns> The root of the tree structure.
///
/// </returns>
public override SubbandSyn getSynSubbandTree(int t, int c)
{
return src.getSynSubbandTree(t, c);
}
/// <summary> Changes the current tile, given the new indexes. An
/// IllegalArgumentException is thrown if the indexes do not
/// correspond to a valid tile.
///
/// <P>This default implementation changes the tile in the source
/// and re-initializes properly component transformation variables..
///
/// </summary>
/// <param name="x">The horizontal index of the tile.
///
/// </param>
/// <param name="y">The vertical index of the new tile.
///
/// </param>
public override void setTile(int x, int y)
{
src.setTile(x, y);
tIdx = TileIdx; // index of the current tile
// initializations
int cttype = 0;
if (((System.Int32) cts.getTileDef(tIdx)) == InvCompTransf.NONE)
cttype = InvCompTransf.NONE;
else
{
int nc = src.NumComps > 3?3:src.NumComps;
int rev = 0;
for (int c = 0; c < nc; c++)
rev += (wfs.isReversible(tIdx, c)?1:0);
if (rev == 3)
{
// All WT are reversible
cttype = InvCompTransf.INV_RCT;
}
else if (rev == 0)
{
// All WT irreversible
cttype = InvCompTransf.INV_ICT;
}
else
{
// Error
throw new System.ArgumentException("Wavelet transformation " + "and " + "component transformation" + " not coherent in tile" + tIdx);
}
}
switch (cttype)
{
case InvCompTransf.NONE:
rb = utrb;
break;
case InvCompTransf.INV_RCT:
rb = InvCompTransf.calcMixedBitDepths(utrb, InvCompTransf.INV_RCT, null);
break;
case InvCompTransf.INV_ICT:
rb = InvCompTransf.calcMixedBitDepths(utrb, InvCompTransf.INV_ICT, null);
break;
default:
throw new System.ArgumentException("Non JPEG 2000 part I " + "component" + " transformation for tile: " + tIdx);
}
}
/// <summary> Advances to the next tile, in standard scan-line order (by rows then
/// columns). An NoNextElementException is thrown if the current tile is
/// the last one (i.e. there is no next tile).
///
/// <P>This default implementation just advances to the next tile in the
/// source and re-initializes properly component transformation variables.
///
/// </summary>
public override void nextTile()
{
src.nextTile();
tIdx = TileIdx; // index of the current tile
// initializations
int cttype = ((System.Int32) cts.getTileDef(tIdx));
switch (cttype)
{
case InvCompTransf.NONE:
rb = utrb;
break;
case InvCompTransf.INV_RCT:
rb = InvCompTransf.calcMixedBitDepths(utrb, InvCompTransf.INV_RCT, null);
break;
case InvCompTransf.INV_ICT:
rb = InvCompTransf.calcMixedBitDepths(utrb, InvCompTransf.INV_ICT, null);
break;
default:
throw new System.ArgumentException("Non JPEG 2000 part I " + "component" + " transformation for tile: " + tIdx);
}
}
public abstract CSJ2K.j2k.image.DataBlk getCodeBlock(int param1, int param2, int param3, CSJ2K.j2k.wavelet.synthesis.SubbandSyn param4, CSJ2K.j2k.image.DataBlk param5);
public abstract int getFixedPoint(int param1);
public abstract CSJ2K.j2k.image.DataBlk getInternCodeBlock(int param1, int param2, int param3, CSJ2K.j2k.wavelet.synthesis.SubbandSyn param4, CSJ2K.j2k.image.DataBlk param5);
}
}
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