001: /*
002: * $RCSfile: SynWTFilterSpec.java,v $
003: * $Revision: 1.1 $
004: * $Date: 2005/02/11 05:02:34 $
005: * $State: Exp $
006: *
007: * Class: SynWTFilterSpec
008: *
009: * Description: Synthesis filters specification
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: *
045: *
046: */
047: package jj2000.j2k.wavelet.synthesis;
048:
049: import jj2000.j2k.util.*;
050: import jj2000.j2k.*;
051:
052: import java.util.*;
053:
054: /**
055: * This class extends ModuleSpec class for synthesis filters
056: * specification holding purpose.
057: *
058: * @see ModuleSpec
059: *
060: * */
061: public class SynWTFilterSpec extends ModuleSpec {
062:
063: /**
064: * Constructs a new 'SynWTFilterSpec' for the specified number of
065: * components and tiles.
066: *
067: * @param nt The number of tiles
068: *
069: * @param nc The number of components
070: *
071: * @param type the type of the specification module i.e. tile specific,
072: * component specific or both.
073: *
074: * */
075: public SynWTFilterSpec(int nt, int nc, byte type) {
076: super (nt, nc, type);
077: }
078:
079: /**
080: * Returns the data type used by the filters in this object, as defined in
081: * the 'DataBlk' interface for specified tile-component.
082: *
083: * @param t Tile index
084: *
085: * @param c Component index
086: *
087: * @return The data type of the filters in this object
088: *
089: * @see jj2000.j2k.image.DataBlk
090: *
091: * */
092: public int getWTDataType(int t, int c) {
093: SynWTFilter[][] an = (SynWTFilter[][]) getSpec(t, c);
094: return an[0][0].getDataType();
095: }
096:
097: /**
098: * Returns the horizontal analysis filters to be used in component 'n' and
099: * tile 't'.
100: *
101: * <P>The horizontal analysis filters are returned in an array of
102: * SynWTFilter. Each element contains the horizontal filter for each
103: * resolution level starting with resolution level 1 (i.e. the analysis
104: * filter to go from resolution level 1 to resolution level 0). If there
105: * are less elements than the maximum resolution level, then the last
106: * element is assumed to be repeated.
107: *
108: * @param t The tile index, in raster scan order
109: *
110: * @param c The component index.
111: *
112: * @return The array of horizontal analysis filters for component 'n' and
113: * tile 't'.
114: *
115: *
116: * */
117: public SynWTFilter[] getHFilters(int t, int c) {
118: SynWTFilter[][] an = (SynWTFilter[][]) getSpec(t, c);
119: return an[0];
120: }
121:
122: /**
123: * Returns the vertical analysis filters to be used in component 'n' and
124: * tile 't'.
125: *
126: * <P>The vertical analysis filters are returned in an array of
127: * SynWTFilter. Each element contains the vertical filter for each
128: * resolution level starting with resolution level 1 (i.e. the analysis
129: * filter to go from resolution level 1 to resolution level 0). If there
130: * are less elements than the maximum resolution level, then the last
131: * element is assumed to be repeated.
132: *
133: * @param t The tile index, in raster scan order
134: *
135: * @param c The component index.
136: *
137: * @return The array of horizontal analysis filters for component 'n' and
138: * tile 't'.
139: *
140: *
141: * */
142: public SynWTFilter[] getVFilters(int t, int c) {
143: SynWTFilter[][] an = (SynWTFilter[][]) getSpec(t, c);
144: return an[1];
145: }
146:
147: /** Debugging method */
148: public String toString() {
149: String str = "";
150: SynWTFilter[][] an;
151:
152: str += "nTiles=" + nTiles + "\nnComp=" + nComp + "\n\n";
153:
154: for (int t = 0; t < nTiles; t++) {
155: for (int c = 0; c < nComp; c++) {
156: an = (SynWTFilter[][]) getSpec(t, c);
157:
158: str += "(t:" + t + ",c:" + c + ")\n";
159:
160: // Horizontal filters
161: str += "\tH:";
162: for (int i = 0; i < an[0].length; i++)
163: str += " " + an[0][i];
164: // Horizontal filters
165: str += "\n\tV:";
166: for (int i = 0; i < an[1].length; i++)
167: str += " " + an[1][i];
168: str += "\n";
169: }
170: }
171:
172: return str;
173: }
174:
175: /**
176: * Check the reversibility of filters contained is the given
177: * tile-component.
178: *
179: * @param t The index of the tile
180: *
181: * @param c The index of the component
182: *
183: */
184: public boolean isReversible(int t, int c) {
185: // Note: no need to buffer the result since this method is
186: // normally called once per tile-component.
187: SynWTFilter[] hfilter = getHFilters(t, c), vfilter = getVFilters(
188: t, c);
189:
190: // As soon as a filter is not reversible, false can be returned
191: for (int i = hfilter.length - 1; i >= 0; i--)
192: if (!hfilter[i].isReversible()
193: || !vfilter[i].isReversible())
194: return false;
195: return true;
196: }
197: }
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