001: /*
002: * $RCSfile: ForwWT.java,v $
003: * $Revision: 1.1 $
004: * $Date: 2005/02/11 05:02:30 $
005: * $State: Exp $
006: *
007: * Class: ForwWT
008: *
009: * Description: The interface for implementations of a forward
010: * wavelet transform.
011: *
012: *
013: *
014: * COPYRIGHT:
015: *
016: * This software module was originally developed by Raphaël Grosbois and
017: * Diego Santa Cruz (Swiss Federal Institute of Technology-EPFL); Joel
018: * Askelöf (Ericsson Radio Systems AB); and Bertrand Berthelot, David
019: * Bouchard, Félix Henry, Gerard Mozelle and Patrice Onno (Canon Research
020: * Centre France S.A) in the course of development of the JPEG2000
021: * standard as specified by ISO/IEC 15444 (JPEG 2000 Standard). This
022: * software module is an implementation of a part of the JPEG 2000
023: * Standard. Swiss Federal Institute of Technology-EPFL, Ericsson Radio
024: * Systems AB and Canon Research Centre France S.A (collectively JJ2000
025: * Partners) agree not to assert against ISO/IEC and users of the JPEG
026: * 2000 Standard (Users) any of their rights under the copyright, not
027: * including other intellectual property rights, for this software module
028: * with respect to the usage by ISO/IEC and Users of this software module
029: * or modifications thereof for use in hardware or software products
030: * claiming conformance to the JPEG 2000 Standard. Those intending to use
031: * this software module in hardware or software products are advised that
032: * their use may infringe existing patents. The original developers of
033: * this software module, JJ2000 Partners and ISO/IEC assume no liability
034: * for use of this software module or modifications thereof. No license
035: * or right to this software module is granted for non JPEG 2000 Standard
036: * conforming products. JJ2000 Partners have full right to use this
037: * software module for his/her own purpose, assign or donate this
038: * software module to any third party and to inhibit third parties from
039: * using this software module for non JPEG 2000 Standard conforming
040: * products. This copyright notice must be included in all copies or
041: * derivative works of this software module.
042: *
043: * Copyright (c) 1999/2000 JJ2000 Partners.
044: *
045: *
046: *
047: */
048:
049: package jj2000.j2k.wavelet.analysis;
050:
051: import jj2000.j2k.wavelet.*;
052:
053: /**
054: * This interface extends the WaveletTransform with the
055: * specifics of forward wavelet transforms. Classes that implement forward
056: * wavelet transfoms should implement this interface.
057: *
058: * <P>This class does not define the methods to transfer data, just the
059: * specifics to forward wavelet transform. Different data transfer methods are
060: * evisageable for different transforms.
061: *
062: * */
063: public interface ForwWT extends WaveletTransform, ForwWTDataProps {
064:
065: /**
066: * Returns the horizontal analysis wavelet filters used in each
067: * level, for the specified tile-component. The first element in
068: * the array is the filter used to obtain the lowest resolution
069: * (resolution level 0) subbands (i.e. lowest frequency LL
070: * subband), the second element is the one used to generate the
071: * resolution level 1 subbands, and so on. If there are less
072: * elements in the array than the number of resolution levels,
073: * then the last one is assumed to repeat itself.
074: *
075: * <P>The returned filters are applicable only to the specified
076: * component and in the current tile.
077: *
078: * <P>The resolution level of a subband is the resolution level to
079: * which a subband contributes, which is different from its
080: * decomposition level.
081: *
082: * @param t The index of the tile for which to return the filters.
083: *
084: * @param c The index of the component for which to return the
085: * filters.
086: *
087: * @return The horizontal analysis wavelet filters used in each
088: * level.
089: *
090: *
091: * */
092: public AnWTFilter[] getHorAnWaveletFilters(int t, int c);
093:
094: /**
095: * Returns the vertical analysis wavelet filters used in each
096: * level, for the specified tile-component. The first element in
097: * the array is the filter used to obtain the lowest resolution
098: * (resolution level 0) subbands (i.e. lowest frequency LL
099: * subband), the second element is the one used to generate the
100: * resolution level 1 subbands, and so on. If there are less
101: * elements in the array than the number of resolution levels,
102: * then the last one is assumed to repeat itself.
103: *
104: * <P>The returned filters are applicable only to the specified
105: * component and in the current tile.
106: *
107: * <P>The resolution level of a subband is the resolution level to
108: * which a subband contributes, which is different from its
109: * decomposition level.
110: *
111: * @param t The index of the tile for which to return the filters.
112: *
113: * @param c The index of the component for which to return the
114: * filters.
115: *
116: * @return The vertical analysis wavelet filters used in each
117: * level.
118: *
119: *
120: * */
121: public AnWTFilter[] getVertAnWaveletFilters(int t, int c);
122:
123: /**
124: * Returns the number of decomposition levels that are applied to
125: * obtain the LL band, in the specified tile-component. A value of
126: * 0 means that no wavelet transform is applied.
127: *
128: * @param t The tile index
129: *
130: * @param c The index of the component.
131: *
132: * @return The number of decompositions applied to obtain the LL
133: * band (0 for no wavelet transform).
134: *
135: *
136: * */
137: public int getDecompLevels(int t, int c);
138:
139: /**
140: * Returns the wavelet tree decomposition. Only WT_DECOMP_DYADIC
141: * is supported by JPEG 2000 part I.
142: *
143: * @param t The tile index
144: *
145: * @param c The index of the component.
146: *
147: * @return The wavelet decomposition.
148: *
149: *
150: * */
151: public int getDecomp(int t, int c);
152: }
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