001/*
002 * $RCSfile: InverseWT.java,v $
003 * $Revision: 1.1 $
004 * $Date: 2005/02/11 05:02:32 $
005 * $State: Exp $
006 *
007 * Class:                   InverseWT
008 *
009 * Description:             This interface defines the specifics
010 *                          of inverse wavelet transforms.
011 *
012 *
013 *
014 * COPYRIGHT:
015 *
016 * This software module was originally developed by Raphaël Grosbois and
017 * Diego Santa Cruz (Swiss Federal Institute of Technology-EPFL); Joel
018 * Askelöf (Ericsson Radio Systems AB); and Bertrand Berthelot, David
019 * Bouchard, Félix Henry, Gerard Mozelle and Patrice Onno (Canon Research
020 * Centre France S.A) in the course of development of the JPEG2000
021 * standard as specified by ISO/IEC 15444 (JPEG 2000 Standard). This
022 * software module is an implementation of a part of the JPEG 2000
023 * Standard. Swiss Federal Institute of Technology-EPFL, Ericsson Radio
024 * Systems AB and Canon Research Centre France S.A (collectively JJ2000
025 * Partners) agree not to assert against ISO/IEC and users of the JPEG
026 * 2000 Standard (Users) any of their rights under the copyright, not
027 * including other intellectual property rights, for this software module
028 * with respect to the usage by ISO/IEC and Users of this software module
029 * or modifications thereof for use in hardware or software products
030 * claiming conformance to the JPEG 2000 Standard. Those intending to use
031 * this software module in hardware or software products are advised that
032 * their use may infringe existing patents. The original developers of
033 * this software module, JJ2000 Partners and ISO/IEC assume no liability
034 * for use of this software module or modifications thereof. No license
035 * or right to this software module is granted for non JPEG 2000 Standard
036 * conforming products. JJ2000 Partners have full right to use this
037 * software module for his/her own purpose, assign or donate this
038 * software module to any third party and to inhibit third parties from
039 * using this software module for non JPEG 2000 Standard conforming
040 * products. This copyright notice must be included in all copies or
041 * derivative works of this software module.
042 *
043 * Copyright (c) 1999/2000 JJ2000 Partners.
044 *
045 *
046 *
047 */
048package jj2000.j2k.wavelet.synthesis;
049
050import jj2000.j2k.decoder.DecoderSpecs;
051import jj2000.j2k.image.BlkImgDataSrc;
052
053/**
054 * This abstract class extends the WaveletTransform one with the specifics of
055 * inverse wavelet transforms.
056 *
057 * <P>The image can be reconstructed at different resolution levels. This is
058 * controlled by the setResLevel() method. All the image, tile and component
059 * dimensions are relative the the resolution level being used. The number of
060 * resolution levels indicates the number of wavelet recompositions that will
061 * be used, if it is equal as the number of decomposition levels then the full
062 * resolution image is reconstructed.
063 *
064 * <P>It is assumed in this class that all tiles and components the same
065 * reconstruction resolution level. If that where not the case the
066 * implementing class should have additional data structures to store those
067 * values for each tile. However, the 'recResLvl' member variable always
068 * contain the values applicable to the current tile, since many methods
069 * implemented here rely on them.
070 * */
071public abstract class InverseWT extends InvWTAdapter
072    implements BlkImgDataSrc {
073
074    /**
075     * Initializes this object with the given source of wavelet
076     * coefficients. It initializes the resolution level for full resolutioin
077     * reconstruction (i.e. the maximum resolution available from the 'src'
078     * source).
079     *
080     * <P>It is assumed here that all tiles and components have the same
081     * reconstruction resolution level. If that was not the case it should be
082     * the value for the current tile of the source.
083     *
084     * @param src from where the wavelet coefficinets should be obtained.
085     *
086     * @param decSpec The decoder specifications
087     * */
088    public InverseWT(MultiResImgData src,DecoderSpecs decSpec){
089        super(src,decSpec);
090    }
091
092    /**
093     * Creates an InverseWT object that works on the data type of the source,
094     * with the special additional parameters from the parameter
095     * list. Currently the parameter list is ignored since no special
096     * parameters can be specified for the inverse wavelet transform yet.
097     *
098     * @param src The source of data for the inverse wavelet
099     * transform.
100     *
101     * @param pl The parameter list containing parameters applicable to the
102     * inverse wavelet transform (other parameters can also be present).
103     * */
104    public static InverseWT createInstance(CBlkWTDataSrcDec src,
105                                           DecoderSpecs decSpec) {
106
107        // full page wavelet transform
108        return new InvWTFull(src,decSpec);
109    }
110}