Source Code Cross Referenced for ROIMaskGenerator.java in  » 6.0-JDK-Modules » Java-Advanced-Imaging » jj2000 » j2k » roi » encoder » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules » Java Advanced Imaging » jj2000.j2k.roi.encoder 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * $RCSfile: ROIMaskGenerator.java,v $
003:         * $Revision: 1.1 $
004:         * $Date: 2005/02/11 05:02:22 $
005:         * $State: Exp $
006:         *
007:         * Class:                   ROIMaskGenerator
008:         *
009:         * Description:             This class describes generators of ROI masks
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:         */
044:        package jj2000.j2k.roi.encoder;
045:
046:        import jj2000.j2k.image.*;
047:        import jj2000.j2k.quantization.*;
048:        import jj2000.j2k.wavelet.*;
049:        import jj2000.j2k.wavelet.analysis.*;
050:        import jj2000.j2k.codestream.writer.*;
051:        import jj2000.j2k.util.*;
052:        import jj2000.j2k.roi.*;
053:
054:        /**
055:         * This class generates the ROI masks for the ROIScaler.It gives the scaler
056:         * the ROI mask for the current code-block.
057:         *
058:         * <P>The values are calculated from the scaling factors of the ROIs. The
059:         * values with which to scale are equal to u-umin where umin is the lowest
060:         * scaling factor within the block. The umin value is sent to the entropy
061:         * coder to be used for scaling the distortion values.
062:         *
063:         * @see RectROIMaskGenerator
064:         *
065:         * @see ArbROIMaskGenerator
066:         *  */
067:        public abstract class ROIMaskGenerator {
068:
069:            /** Array containing the ROIs */
070:            protected ROI[] rois;
071:
072:            /** Number of components */
073:            protected int nrc;
074:
075:            /** Flag indicating whether a mask has been made for the current tile */
076:            protected boolean tileMaskMade[];
077:
078:            /* Flag indicating whether there are any ROIs in this tile */
079:            protected boolean roiInTile;
080:
081:            /**
082:             * The constructor of the mask generator
083:             *
084:             * @param rois The ROIs in the image
085:             *
086:             * @param nrc The number of components
087:             */
088:            public ROIMaskGenerator(ROI[] rois, int nrc) {
089:                this .rois = rois;
090:                this .nrc = nrc;
091:                tileMaskMade = new boolean[nrc];
092:            }
093:
094:            /**
095:             * This function returns the ROIs in the image
096:             *
097:             * @return The ROIs in the image
098:             */
099:            public ROI[] getROIs() {
100:                return rois;
101:            }
102:
103:            /**
104:             * This functions gets a DataBlk with the size of the current code-block
105:             * and fills it with the ROI mask. The lowest scaling value in the mask
106:             * for this code-block is returned by the function to be used for
107:             * modifying the rate distortion estimations.
108:             *
109:             * @param db The data block that is to be filled with the mask
110:             *
111:             * @param sb The root of the current subband tree
112:             *
113:             * @param magbits The number of magnitude bits in this code-block
114:             *
115:             * @param c Component number
116:             *
117:             * @return Whether or not a mask was needed for this tile */
118:            public abstract boolean getROIMask(DataBlkInt db, Subband sb,
119:                    int magbits, int c);
120:
121:            /**
122:             * This function generates the ROI mask for the entire tile. The mask is
123:             * generated for one component. This method is called once for each tile
124:             * and component.
125:             *
126:             * @param sb The root of the subband tree used in the decomposition
127:             *
128:             * @param magbits The max number of magnitude bits in any code-block
129:             *
130:             * @param n component number
131:             */
132:            public abstract void makeMask(Subband sb, int magbits, int n);
133:
134:            /**
135:             * This function is called every time the tile is changed to indicate
136:             * that there is need to make a new mask
137:             */
138:            public void tileChanged() {
139:                for (int i = 0; i < nrc; i++)
140:                    tileMaskMade[i] = false;
141:            }
142:
143:        }
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