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1/*
2 * Copyright (c) 2002-2007, Communications and Remote Sensing Laboratory, Universite catholique de Louvain (UCL), Belgium
3 * Copyright (c) 2002-2007, Professor Benoit Macq
4 * Copyright (c) 2001-2003, David Janssens
5 * Copyright (c) 2002-2003, Yannick Verschueren
6 * Copyright (c) 2003-2007, Francois-Olivier Devaux and Antonin Descampe
7 * Copyright (c) 2005, Herve Drolon, FreeImage Team
8 * All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
20 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
23 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#ifndef __DWT_H
33#define __DWT_H
34/**
35@file dwt.h
36@brief Implementation of a discrete wavelet transform (DWT)
37
38The functions in DWT.C have for goal to realize forward and inverse discret wavelet
39transform with filter 5-3 (reversible) and filter 9-7 (irreversible). The functions in
40DWT.C are used by some function in TCD.C.
41*/
42
43/** @defgroup DWT DWT - Implementation of a discrete wavelet transform */
44/*@{*/
45
46
47/** @name Exported functions */
48/*@{*/
49/* ----------------------------------------------------------------------- */
50/**
51Forward 5-3 wavelet tranform in 2-D.
52Apply a reversible DWT transform to a component of an image.
53@param tilec Tile component information (current tile)
54*/
55void dwt_encode(opj_tcd_tilecomp_t * tilec);
56/**
57Inverse 5-3 wavelet tranform in 2-D.
58Apply a reversible inverse DWT transform to a component of an image.
59@param tilec Tile component information (current tile)
60@param stop FIXME Number of decoded resolution levels ?
61*/
62void dwt_decode(opj_tcd_tilecomp_t * tilec, int stop);
63/**
64Get the gain of a subband for the reversible 5-3 DWT.
65@param orient Number that identifies the subband (0->LL, 1->HL, 2->LH, 3->HH)
66@return Returns 0 if orient = 0, returns 1 if orient = 1 or 2, returns 2 otherwise
67*/
68int dwt_getgain(int orient);
69/**
70Get the norm of a wavelet function of a subband at a specified level for the reversible 5-3 DWT.
71@param level Level of the wavelet function
72@param orient Band of the wavelet function
73@return Returns the norm of the wavelet function
74*/
75double dwt_getnorm(int level, int orient);
76/**
77Forward 9-7 wavelet transform in 2-D.
78Apply an irreversible DWT transform to a component of an image.
79@param tilec Tile component information (current tile)
80*/
81void dwt_encode_real(opj_tcd_tilecomp_t * tilec);
82/**
83Inverse 9-7 wavelet transform in 2-D.
84Apply an irreversible inverse DWT transform to a component of an image.
85@param tilec Tile component information (current tile)
86@param stop FIXME Number of decoded resolution levels ?
87*/
88void dwt_decode_real(opj_tcd_tilecomp_t * tilec, int stop);
89/**
90Get the gain of a subband for the irreversible 9-7 DWT.
91@param orient Number that identifies the subband (0->LL, 1->HL, 2->LH, 3->HH)
92@return Returns the gain of the 9-7 wavelet transform
93*/
94int dwt_getgain_real(int orient);
95/**
96Get the norm of a wavelet function of a subband at a specified level for the irreversible 9-7 DWT
97@param level Level of the wavelet function
98@param orient Band of the wavelet function
99@return Returns the norm of the 9-7 wavelet
100*/
101double dwt_getnorm_real(int level, int orient);
102/**
103FIXME : comment ???
104@param tccp
105@param prec
106*/
107void dwt_calc_explicit_stepsizes(opj_tccp_t * tccp, int prec);
108/* ----------------------------------------------------------------------- */
109/*@}*/
110
111/*@}*/
112
113#endif /* __DWT_H */