anwtfilterspec.java

java 实现的小波压缩库代码,内部包含了分析器

/* 
 * CVS identifier:
 * 
 * $Id: AnWTFilterSpec.java,v 1.27 2001/05/08 16:11:37 grosbois Exp $
 * 
 * Class:                   AnWTFilterSpec
 * 
 * Description:             Analysis filters specification
 * 
 * 
 * 
 * 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.analysis;

import jj2000.j2k.quantization.*;
import jj2000.j2k.util.*;
import jj2000.j2k.*;

import java.util.*;

/**
 * This class extends ModuleSpec class for analysis filters specification
 * holding purpose.
 *
 * @see ModuleSpec
 * */
public class AnWTFilterSpec extends ModuleSpec {

    /** The reversible default filter */
    private final static String REV_FILTER_STR = "w5x3";

    /** The non-reversible default filter */
    private final static String NON_REV_FILTER_STR = "w9x7";

    /**
     * Constructs a new 'AnWTFilterSpec' for the specified number of
     * components and tiles.
     *
     * @param nt The number of tiles
     *
     * @param nc The number of components
     *
     * @param type the type of the specification module i.e. tile specific,
     * component specific or both.
     *
     * @param qts Quantization specifications
     *
     * @param pl The ParameterList
     * */
    public AnWTFilterSpec(int nt, int nc, byte type, 
                          QuantTypeSpec qts,ParameterList pl) {
        super(nt,nc,type);

        // Check parameters
        pl.checkList(AnWTFilter.OPT_PREFIX,
		     pl.toNameArray(AnWTFilter.getParameterInfo()));
	
	String param = pl.getParameter("Ffilters");
        boolean isFilterSpecified = true;

	// No parameter specified
	if(param==null) {
            isFilterSpecified = false;

            // If lossless compression, uses the reversible filters in each
            // tile-components 
            if(pl.getBooleanParameter("lossless")) {
                setDefault(parseFilters(REV_FILTER_STR));
                return;
            }

	    // If no filter is specified through the command-line, use
	    // REV_FILTER_STR or NON_REV_FILTER_STR according to the
	    // quantization type
	    for(int t=nt-1;t>=0;t--) {
		for(int c=nc-1;c>=0;c--) {
		    switch(qts.getSpecValType(t,c)) {
		    case SPEC_DEF:
			if(getDefault()==null) {
                            if( pl.getBooleanParameter("lossless") )
                                setDefault(parseFilters(REV_FILTER_STR));
			    if( ((String)qts.getDefault()).
                                equals("reversible") ) {
				setDefault(parseFilters(REV_FILTER_STR));
			    } else {
				setDefault(parseFilters(NON_REV_FILTER_STR));
			    }
			}
			specValType[t][c] = SPEC_DEF;
			break;
		    case SPEC_COMP_DEF:
			if(!isCompSpecified(c)){
			    if( ((String)qts.getCompDef(c)).
                                equals("reversible") ) {
				setCompDef(c,parseFilters(REV_FILTER_STR));
			    } else{
				setCompDef(c,parseFilters(NON_REV_FILTER_STR));
			    }
			}
			specValType[t][c] = SPEC_COMP_DEF;
			break;
		    case SPEC_TILE_DEF:
			if(!isTileSpecified(t)){
			    if( ((String)qts.getTileDef(t)).
                                equals("reversible") ) {
				setTileDef(t,parseFilters(REV_FILTER_STR));
			    } else {
				setTileDef(t,parseFilters(NON_REV_FILTER_STR));
			    }
			}
			specValType[t][c] = SPEC_TILE_DEF;
			break;
		    case SPEC_TILE_COMP:
			if(!isTileCompSpecified(t,c)) {
			    if(((String)qts.getTileCompVal(t,c)).
                               equals("reversible")) {
				setTileCompVal(t,c,
                                               parseFilters(REV_FILTER_STR));
			    } else {
				setTileCompVal(t,c,
                                               parseFilters(NON_REV_FILTER_STR)
                                               );
			    }
			}
			specValType[t][c] = SPEC_TILE_COMP;
			break;
		    default:
			throw new IllegalArgumentException("Unsupported "+
							   "specification "+
                                                           "type");
		    }
		}
	    }
            return;
	}

	// Parse argument
	StringTokenizer stk = new StringTokenizer(param);
	String word; // current word
	byte curSpecType = SPEC_DEF; // Specification type of the
	// current parameter
	boolean[] tileSpec = null; // Tiles concerned by the specification
	boolean[] compSpec = null; // Components concerned by the specification
	AnWTFilter[][] filter;
	
	while(stk.hasMoreTokens()){
	    word = stk.nextToken();
	  
	    switch(word.charAt(0)){
	    case 't': // Tiles specification
	    case 'T': // Tiles specification
 		tileSpec = parseIdx(word,nTiles);
		if(curSpecType==SPEC_COMP_DEF)
		    curSpecType = SPEC_TILE_COMP;
		else
		    curSpecType = SPEC_TILE_DEF;
 		break;
	    case 'c': // Components specification
	    case 'C': // Components specification
		compSpec = parseIdx(word,nComp);
		if(curSpecType==SPEC_TILE_DEF)
		    curSpecType = SPEC_TILE_COMP;
		else
		    curSpecType = SPEC_COMP_DEF;
		break;
	    case 'w': // WT filters specification
	    case 'W': // WT filters specification
                if(pl.getBooleanParameter("lossless") && 
                   word.equalsIgnoreCase("w9x7") )  {
                    throw new IllegalArgumentException("Cannot use non "+
                                                       "reversible "+
                                                       "wavelet transform with"+
                                                       " '-lossless' option");

                }

		filter = parseFilters(word);
		if(curSpecType==SPEC_DEF){
		    setDefault(filter);
		}
		else if(curSpecType==SPEC_TILE_DEF){
		    for(int i=tileSpec.length-1; i>=0; i--)
			if(tileSpec[i]){
			    setTileDef(i,filter);
                        }
		}
		else if(curSpecType==SPEC_COMP_DEF){
		    for(int i=compSpec.length-1; i>=0; i--)
			if(compSpec[i]){
			    setCompDef(i,filter);
                        }
		}
		else{
		    for(int i=tileSpec.length-1; i>=0; i--){
			for(int j=compSpec.length-1; j>=0 ; j--){
			    if(tileSpec[i] && compSpec[j]){
				setTileCompVal(i,j,filter);
                            }
			}
		    }
		}

		// Re-initialize
		curSpecType = SPEC_DEF;
		tileSpec = null;
		compSpec = null;
		break;

	    default:
		throw new IllegalArgumentException("Bad construction for "+
						   "parameter: "+word); 
	    }
	}