001/*
002 * $RCSfile: SubbandRectROIMask.java,v $
003 * $Revision: 1.1 $
004 * $Date: 2005/02/11 05:02:24 $
005 * $State: Exp $
006 *
007 * Class:                   ROI
008 *
009 * Description:             This class describes the ROI mask for a subband
010 *
011 *
012 *
013 * COPYRIGHT:
014 *
015 * This software module was originally developed by Raphaël Grosbois and
016 * Diego Santa Cruz (Swiss Federal Institute of Technology-EPFL); Joel
017 * Askelöf (Ericsson Radio Systems AB); and Bertrand Berthelot, David
018 * Bouchard, Félix Henry, Gerard Mozelle and Patrice Onno (Canon Research
019 * Centre France S.A) in the course of development of the JPEG2000
020 * standard as specified by ISO/IEC 15444 (JPEG 2000 Standard). This
021 * software module is an implementation of a part of the JPEG 2000
022 * Standard. Swiss Federal Institute of Technology-EPFL, Ericsson Radio
023 * Systems AB and Canon Research Centre France S.A (collectively JJ2000
024 * Partners) agree not to assert against ISO/IEC and users of the JPEG
025 * 2000 Standard (Users) any of their rights under the copyright, not
026 * including other intellectual property rights, for this software module
027 * with respect to the usage by ISO/IEC and Users of this software module
028 * or modifications thereof for use in hardware or software products
029 * claiming conformance to the JPEG 2000 Standard. Those intending to use
030 * this software module in hardware or software products are advised that
031 * their use may infringe existing patents. The original developers of
032 * this software module, JJ2000 Partners and ISO/IEC assume no liability
033 * for use of this software module or modifications thereof. No license
034 * or right to this software module is granted for non JPEG 2000 Standard
035 * conforming products. JJ2000 Partners have full right to use this
036 * software module for his/her own purpose, assign or donate this
037 * software module to any third party and to inhibit third parties from
038 * using this software module for non JPEG 2000 Standard conforming
039 * products. This copyright notice must be included in all copies or
040 * derivative works of this software module.
041 *
042 * Copyright (c) 1999/2000 JJ2000 Partners.
043 * */
044package jj2000.j2k.roi.encoder;
045
046import jj2000.j2k.codestream.writer.*;
047import jj2000.j2k.wavelet.analysis.*;
048import jj2000.j2k.quantization.*;
049import jj2000.j2k.wavelet.*;
050import jj2000.j2k.image.*;
051import jj2000.j2k.util.*;
052import jj2000.j2k.roi.*;
053
054/**
055 * This class describes the ROI mask for a single subband. Each object of the
056 * class contains the mask for a particular subband and also has references to
057 * the masks of the children subbands of the subband corresponding to this
058 * mask. This class describes subband masks for images containing only
059 * rectangular ROIS
060 * */
061public class SubbandRectROIMask extends SubbandROIMask{
062
063    /** The upper left x coordinates of the applicable ROIs */
064    public int[] ulxs;
065
066    /** The upper left y coordinates of the applicable ROIs */
067    public int[] ulys;
068
069    /** The lower right x coordinates of the applicable ROIs */
070    public int[] lrxs;
071
072    /** The lower right y coordinates of the applicable ROIs */
073    public int[] lrys;
074
075    /**
076     * The constructor of the SubbandROIMask takes the dimensions of the
077     * subband as parameters. A tree of masks is generated from the subband
078     * sb. Each Subband contains the boundaries of each ROI.
079     *
080     * @param sb The subband corresponding to this Subband Mask
081     *
082     * @param ulxs The upper left x coordinates of the ROIs
083     *
084     * @param ulys The upper left y coordinates of the ROIs
085     *
086     * @param lrxs The lower right x coordinates of the ROIs
087     *
088     * @param lrys The lower right y coordinates of the ROIs
089     *
090     * @param lrys The lower right y coordinates of the ROIs
091     *
092     * @param nr Number of ROIs that affect this tile
093     * */
094    public SubbandRectROIMask(Subband sb, int[] ulxs, int[] ulys, int[] lrxs,
095                          int[] lrys, int nr){
096        super(sb.ulx,sb.uly,sb.w,sb.h);
097        this.ulxs = ulxs;
098        this.ulys = ulys;
099        this.lrxs = lrxs;
100        this.lrys = lrys;
101        int r;
102
103        if(sb.isNode){
104            isNode=true;
105            // determine odd/even - high/low filters
106            int horEvenLow = sb.ulcx%2;
107            int verEvenLow = sb.ulcy%2;
108
109            // Get filter support lengths
110            WaveletFilter hFilter = sb.getHorWFilter();
111            WaveletFilter vFilter = sb.getVerWFilter();
112            int hlnSup = hFilter.getSynLowNegSupport();
113            int hhnSup = hFilter.getSynHighNegSupport();
114            int hlpSup = hFilter.getSynLowPosSupport();
115            int hhpSup = hFilter.getSynHighPosSupport();
116            int vlnSup = vFilter.getSynLowNegSupport();
117            int vhnSup = vFilter.getSynHighNegSupport();
118            int vlpSup = vFilter.getSynLowPosSupport();
119            int vhpSup = vFilter.getSynHighPosSupport();
120
121            // Generate arrays for children
122            int x,y;
123            int[] lulxs = new int[nr];
124            int[] lulys = new int[nr];
125            int[] llrxs = new int[nr];
126            int[] llrys = new int[nr];
127            int[] hulxs = new int[nr];
128            int[] hulys = new int[nr];
129            int[] hlrxs = new int[nr];
130            int[] hlrys = new int[nr];
131            for(r=nr-1;r>=0;r--){ // For all ROI calculate ...
132                // Upper left x for all children
133                x = ulxs[r];
134                if(horEvenLow==0){
135                    lulxs[r] = (x+1-hlnSup)/2;
136                    hulxs[r] = (x-hhnSup)/2;
137                }
138                else{
139                    lulxs[r] = (x-hlnSup)/2;
140                    hulxs[r] = (x+1-hhnSup)/2;
141                }
142                // Upper left y for all children
143                y = ulys[r];
144                if(verEvenLow==0){
145                    lulys[r] = (y+1-vlnSup)/2;
146                    hulys[r] = (y-vhnSup)/2;
147                }
148                else{
149                    lulys[r] = (y-vlnSup)/2;
150                    hulys[r] = (y+1-vhnSup)/2;
151                }
152                // lower right x for all children
153                x = lrxs[r];
154                if(horEvenLow==0){
155                    llrxs[r] = (x+hlpSup)/2;
156                    hlrxs[r] = (x-1+hhpSup)/2;
157                }
158                else{
159                    llrxs[r] = (x-1+hlpSup)/2;
160                    hlrxs[r] = (x+hhpSup)/2;
161                }
162                // lower right y for all children
163                y=lrys[r];
164                if(verEvenLow==0){
165                    llrys[r] = (y+vlpSup)/2;
166                    hlrys[r] = (y-1+vhpSup)/2;
167                }
168                else{
169                    llrys[r] = (y-1+vlpSup)/2;
170                    hlrys[r] = (y+vhpSup)/2;
171                }
172            }
173            // Create children
174            hh = new SubbandRectROIMask(sb.getHH(),hulxs,hulys,hlrxs,hlrys,nr);
175            lh = new SubbandRectROIMask(sb.getLH(),lulxs,hulys,llrxs,hlrys,nr);
176            hl = new SubbandRectROIMask(sb.getHL(),hulxs,lulys,hlrxs,llrys,nr);
177            ll = new SubbandRectROIMask(sb.getLL(),lulxs,lulys,llrxs,llrys,nr);
178
179        }
180    }
181}
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