corrade-vassal – Rev 1
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/*
* CVS identifier:
*
* $Id: Quantizer.java,v 1.38 2002/01/09 13:24:14 grosbois Exp $
*
* Class: Quantizer
*
* Description: An abstract class for quantizers
*
*
*
* 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.codestream.writer;
using CSJ2K.j2k.wavelet.analysis;
using CSJ2K.j2k.quantization;
using CSJ2K.j2k.wavelet;
using CSJ2K.j2k.encoder;
using CSJ2K.j2k.image;
using CSJ2K.j2k.util;
namespace CSJ2K.j2k.quantization.quantizer
{
/// <summary> This abstract class provides the general interface for quantizers. The
/// input of a quantizer is the output of a wavelet transform. The output of
/// the quantizer is the set of quantized wavelet coefficients represented in
/// sign-magnitude notation (see below).
///
/// <p>This class provides default implementation for most of the methods
/// (wherever it makes sense), under the assumption that the image, component
/// dimensions, and the tiles, are not modifed by the quantizer. If it 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 output 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 M most significat bits. The rest of the bits (least
/// significant bits) can contain a fractional value of the quantized
/// coefficient. This fractional value is not to be coded by the entropy
/// coder. However, it can be used to compute rate-distortion measures with
/// greater precision.</p>
///
/// <p>The value of M is determined for each subband as the sum of the number
/// of guard bits G and the nominal range of quantized wavelet coefficients in
/// the corresponding subband (Rq), minus 1:</p>
///
/// <p>M = G + Rq -1</p>
///
/// <p>The value of G should be the same for all subbands. The value of Rq
/// depends on the quantization step size, the nominal range of the component
/// before the wavelet transform and the analysis gain of the subband (see
/// Subband).</p>
///
/// <p>The blocks of data that are requested should not cross subband
/// boundaries.</p>
///
/// <p>NOTE: At the moment only quantizers that implement the
/// 'CBlkQuantDataSrcEnc' interface are supported.</p>
///
/// </summary>
/// <seealso cref="Subband">
///
/// </seealso>
public abstract class Quantizer:ImgDataAdapter, CBlkQuantDataSrcEnc
{
/// <summary> Returns the horizontal offset of the code-block partition. Allowable
/// values are 0 and 1, nothing else.
///
/// </summary>
virtual public int CbULX
{
get
{
return src.CbULX;
}
}
/// <summary> Returns the vertical offset of the code-block partition. 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, the third one is a long
/// description of what the parameter is and the fourth is its default
/// value. 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 quantizer options: 'Q' </summary>
public const char OPT_PREFIX = 'Q';
/// <summary>The list of parameters that is accepted for quantization. Options
/// for quantization 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 = new System.String[][]{new System.String[]{"Qtype", "[<tile-component idx>] <id> " + "[ [<tile-component idx>] <id> ...]", "Specifies which quantization type to use for specified " + "tile-component. The default type is either 'reversible' or " + "'expounded' depending on whether or not the '-lossless' option " + " is specified.\n" + "<tile-component idx> : see general note.\n" + "<id>: Supported quantization types specification are : " + "'reversible' " + "(no quantization), 'derived' (derived quantization step size) and " + "'expounded'.\n" + "Example: -Qtype reversible or -Qtype t2,4-8 c2 reversible t9 " + "derived.", null}, new System.String[]{"Qstep", "[<tile-component idx>] <bnss> " + "[ [<tile-component idx>] <bnss> ...]", "This option specifies the base normalized quantization step " + "size (bnss) for tile-components. It is normalized to a " + "dynamic range of 1 in the image domain. This parameter is " + "ignored in reversible coding. The default value is '1/128'" + " (i.e. 0.0078125).", "0.0078125"}, new System.String[]{"Qguard_bits", "[<tile-component idx>] <gb> " + "[ [<tile-component idx>] <gb> ...]", "The number of bits used for each tile-component in the quantizer" + " to avoid overflow (gb).", "2"}};
/// <summary>The source of wavelet transform coefficients </summary>
protected internal CBlkWTDataSrc src;
/// <summary> Initializes the source of wavelet transform coefficients.
///
/// </summary>
/// <param name="src">The source of wavelet transform coefficients.
///
/// </param>
public Quantizer(CBlkWTDataSrc src):base(src)
{
this.src = src;
}
/// <summary> Returns the number of guard bits used by this quantizer in the
/// given tile-component.
///
/// </summary>
/// <param name="t">Tile index
///
/// </param>
/// <param name="c">Component index
///
/// </param>
/// <returns> The number of guard bits
///
/// </returns>
public abstract int getNumGuardBits(int t, int c);
/// <summary> Returns true if the quantizer of given tile-component uses derived
/// quantization step sizes.
///
/// </summary>
/// <param name="t">Tile index
///
/// </param>
/// <param name="c">Component index
///
/// </param>
/// <returns> True if derived quantization is used.
///
/// </returns>
public abstract bool isDerived(int t, int c);
/// <summary> Calculates the parameters of the SubbandAn objects that depend on the
/// Quantizer. The 'stepWMSE' field is calculated for each subband which is
/// a leaf in the tree rooted at 'sb', for the specified component. The
/// subband tree 'sb' must be the one for the component 'n'.
///
/// </summary>
/// <param name="sb">The root of the subband tree.
///
/// </param>
/// <param name="n">The component index.
///
/// </param>
/// <seealso cref="SubbandAn.stepWMSE">
///
/// </seealso>
protected internal abstract void calcSbParams(SubbandAn sb, int n);
/// <summary> Returns a reference to the subband tree structure representing the
/// subband decomposition for the specified tile-component.
///
/// <P>This method gets the subband tree from the source and then
/// calculates the magnitude bits for each leaf using the method
/// calcSbParams().
///
/// </summary>
/// <param name="t">The index of the tile.
///
/// </param>
/// <param name="c">The index of the component.
///
/// </param>
/// <returns> The subband tree structure, see SubbandAn.
///
/// </returns>
/// <seealso cref="SubbandAn">
///
/// </seealso>
/// <seealso cref="Subband">
///
/// </seealso>
/// <seealso cref="calcSbParams">
///
/// </seealso>
public virtual SubbandAn getAnSubbandTree(int t, int c)
{
SubbandAn sbba;
// Ask for the wavelet tree of the source
sbba = src.getAnSubbandTree(t, c);
// Calculate the stepWMSE
calcSbParams(sbba, c);
return sbba;
}
/// <summary> Creates a Quantizer object for the appropriate type of quantization
/// specified in the options in the parameter list 'pl', and having 'src'
/// as the source of data to be quantized. The 'rev' flag indicates if the
/// quantization should be reversible.
///
/// NOTE: At the moment only sources of wavelet data that implement the
/// 'CBlkWTDataSrc' interface are supported.
///
/// </summary>
/// <param name="src">The source of data to be quantized
///
/// </param>
/// <param name="encSpec">Encoder specifications
///
/// </param>
/// <exception cref="IllegalArgumentException">If an error occurs while parsing
/// the options in 'pl'
///
/// </exception>
public static Quantizer createInstance(CBlkWTDataSrc src, EncoderSpecs encSpec)
{
// Instantiate quantizer
return new StdQuantizer(src, encSpec);
}
/// <summary> Returns the maximum number of magnitude bits in any subband in the
/// current tile.
///
/// </summary>
/// <param name="c">the component number
///
/// </param>
/// <returns> The maximum number of magnitude bits in all subbands of the
/// current tile.
///
/// </returns>
public abstract int getMaxMagBits(int c);
public abstract CSJ2K.j2k.wavelet.analysis.CBlkWTData getNextInternCodeBlock(int param1, CSJ2K.j2k.wavelet.analysis.CBlkWTData param2);
public abstract CSJ2K.j2k.wavelet.analysis.CBlkWTData getNextCodeBlock(int param1, CSJ2K.j2k.wavelet.analysis.CBlkWTData param2);
public abstract bool isReversible(int param1, int param2);
}
}
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