libremetaverse/CSJ2K/j2k/quantization/dequantizer/StdDequantizerParams.cs

/*
* CVS identifier:
*
* $Id: StdDequantizerParams.java,v 1.9 2000/09/19 14:12:09 grosbois Exp $
*
* Class:                   StdDequantizerParams
*
* Description:             Parameters for the scalar deadzone 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.io;
using CSJ2K.j2k.wavelet;
using CSJ2K.j2k.quantization;
using CSJ2K.j2k.entropy.decoder;
using CSJ2K.j2k.image;
using CSJ2K.j2k.util;
using CSJ2K.j2k.codestream;
using CSJ2K.j2k.codestream.reader;
namespace CSJ2K.j2k.quantization.dequantizer
{
	
	/// <summary> This class holds the parameters for the scalar deadzone dequantizer
	/// (StdDequantizer class) for the current tile. Its constructor decodes the
	/// parameters from the main header and tile headers.
	/// 
	/// </summary>
	/// <seealso cref="StdDequantizer">
	/// 
	/// </seealso>
	public class StdDequantizerParams:DequantizerParams
	{
		/// <summary> Returns the type of the dequantizer for which the parameters are. The
		/// types are defined in the Dequantizer class.
		/// 
		/// </summary>
		/// <returns> The type of the dequantizer for which the parameters
		/// are. Always Q_TYPE_SCALAR_DZ.
		/// 
		/// </returns>
		/// <seealso cref="Dequantizer">
		/// 
		/// </seealso>
		override public int DequantizerType
		{
			get
			{
				return CSJ2K.j2k.quantization.QuantizationType_Fields.Q_TYPE_SCALAR_DZ;
			}
			
		}
		
		/// <summary> The quantization step "exponent" value, for each resolution level and
		/// subband, as it appears in the codestream. The first index is the
		/// resolution level, and the second the subband index (within the
		/// resolution level), as specified in the Subband class. When in derived
		/// quantization mode only the first resolution level (level 0) appears.
		/// 
		/// <P>For non-reversible systems this value corresponds to ceil(log2(D')),
		/// where D' is the quantization step size normalized to data of a dynamic
		/// range of 1. The true quantization step size is (2^R)*D', where R is
		/// ceil(log2(dr)), where 'dr' is the dynamic range of the subband samples,
		/// in the corresponding subband.
		/// 
		/// <P>For reversible systems the exponent value in 'exp' is used to
		/// determine the number of magnitude bits in the quantized
		/// coefficients. It is, in fact, the dynamic range of the subband data.
		/// 
		/// <P>In general the index of the first subband in a resolution level is
		/// not 0. The exponents appear, within each resolution level, at their
		/// subband index, and not in the subband order starting from 0. For
		/// instance, resolution level 3, the first subband has the index 16, then
		/// the exponent of the subband is exp[3][16], not exp[3][0].
		/// 
		/// </summary>
		/// <seealso cref="Subband">
		/// 
		/// </seealso>
		public int[][] exp;
		
		/// <summary> The quantization step for non-reversible systems, normalized to a
		/// dynamic range of 1, for each resolution level and subband, as derived
		/// from the exponent-mantissa representation in the codestream. The first
		/// index is the resolution level, and the second the subband index (within
		/// the resolution level), as specified in the Subband class. When in
		/// derived quantization mode only the first resolution level (level 0)
		/// appears.
		/// 
		/// <P>The true step size D is obtained as follows: D=(2^R)*D', where
		/// 'R=ceil(log2(dr))' and 'dr' is the dynamic range of the subband
		/// samples, in the corresponding subband.
		/// 
		/// <P>This value is 'null' for reversible systems (i.e. there is no true
		/// quantization, 'D' is always 1).
		/// 
		/// <P>In general the index of the first subband in a resolution level is
		/// not 0. The steps appear, within each resolution level, at their subband
		/// index, and not in the subband order starting from 0. For instance, if
		/// resolution level 3, the first subband has the index 16, then the step
		/// of the subband is nStep[3][16], not nStep[3][0].
		/// 
		/// </summary>
		/// <seealso cref="Subband">
		/// 
		/// </seealso>
		public float[][] nStep;
	}
}