wtfilterspec.java

jpeg2000编解码

/* 
 * CVS identifier:
 * 
 * $Id: WTFilterSpec.java,v 1.1.1.1 2002/07/22 09:26:54 grosbois Exp $
 * 
 * Class:                   WTFilterSpec
 * 
 * Description:             Generic class for storing wavelet filter specs
 * 
 * 
 * 
 * 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.wavelet;

/**
 * This is the generic class from which the ones that hold the analysis or
 * synthesis filters to be used in each part of the image derive. See
 * AnWTFilterSpec and SynWTFilterSpec.
 *
 * <P>The filters to use are defined by a hierarchy. The hierarchy is:
 *
 * <P>- Tile and component specific filters<br>
 * - Tile specific default filters<br>
 * - Component main default filters<br>
 * - Main default filters<br>
 *
 * <P>At the moment tiles are not supported by this class.
 *
 * @see jj2000.j2k.wavelet.analysis.AnWTFilterSpec
 *
 * @see jj2000.j2k.wavelet.synthesis.SynWTFilterSpec
 * */

public abstract class WTFilterSpec {

    /** The identifier for "main default" specified filters */
    public final static byte FILTER_SPEC_MAIN_DEF = 0;

    /** The identifier for "component default" specified filters */
    public final static byte FILTER_SPEC_COMP_DEF = 1;

    /** The identifier for "tile specific default" specified filters */
    public final static byte FILTER_SPEC_TILE_DEF = 2;

    /** The identifier for "tile and component specific" specified filters */
    public final static byte FILTER_SPEC_TILE_COMP = 3;

    /** The spec type for each tile and component. The first index is the
     * component index, the second is the tile index. NOTE: The tile specific
     * things are not supported yet. */
    // Use byte to save memory (no need for speed here).
    protected byte specValType[];

    /**
     * Constructs a 'WTFilterSpec' object, initializing all the components and
     * tiles to the 'FILTER_SPEC_MAIN_DEF' spec type, for the specified number
     * of components and tiles.
     *
     * <P>NOTE: The tile specific things are not supported yet
     *
     * @param nc The number of components
     *
     * @param nt The number of tiles
     *
     *
     * */
    protected WTFilterSpec(int nc) {
        specValType = new byte[nc];
    }

    /**
     * Returns the data type used by the filters in this object, as defined in 
     * the 'DataBlk' interface.
     *
     * @return The data type of the filters in this object
     *
     * @see jj2000.j2k.image.DataBlk
     *
     *
     * */
    public abstract int getWTDataType();

    /**
     * Returns the type of specification for the filters in the specified
     * component and tile. The specification type is one of:
     * 'FILTER_SPEC_MAIN_DEF', 'FILTER_SPEC_COMP_DEF', 'FILTER_SPEC_TILE_DEF',
     * 'FILTER_SPEC_TILE_COMP'.
     *
     * <P>NOTE: The tile specific things are not supported yet
     *
     * @param n The component index
     *
     * @param t The tile index, in raster scan order.
     *
     * @return The specification type for component 'n' and tile 't'.
     *
     *
     * */
    public byte getKerSpecType(int n) {
        return specValType[n];
    }

}