/* * 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 Rapha雔 Grosbois and * Diego Santa Cruz (Swiss Federal Institute of Technology-EPFL); Joel * Askel鰂 (Ericsson Radio Systems AB); and Bertrand Berthelot, David * Bouchard, F閘ix 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.io.*;import jj2000.j2k.wavelet.*;import jj2000.j2k.quantization.*;import jj2000.j2k.entropy.decoder.*;import jj2000.j2k.image.*;import jj2000.j2k.util.*;import jj2000.j2k.codestream.*;import jj2000.j2k.codestream.reader.*;import java.io.*;/** * 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. * * @see StdDequantizer * */public class StdDequantizerParams extends DequantizerParams {    /**     * 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].     *     * @see Subband     * */    public int exp[][];    /**     * 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].     *     * @see Subband     * */    public float nStep[][];    /**     * Returns the type of the dequantizer for which the parameters are. The     * types are defined in the Dequantizer class.     *     * @return The type of the dequantizer for which the parameters     * are. Always Q_TYPE_SCALAR_DZ.     *     * @see Dequantizer     * */    public int getDequantizerType() {        return QuantizationType.Q_TYPE_SCALAR_DZ;    }}