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
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36 @brief Implementation of a discrete wavelet transform (DWT)
38 The functions in DWT.C have for goal to realize forward and inverse discret wavelet
39 transform with filter 5-3 (reversible) and filter 9-7 (irreversible). The functions in
40 DWT.C are used by some function in TCD.C.
43 /** @defgroup DWT DWT - Implementation of a discrete wavelet transform */
47 /** @name Exported functions */
49 /* ----------------------------------------------------------------------- */
51 Forward 5-3 wavelet tranform in 2-D.
52 Apply a reversible DWT transform to a component of an image.
53 @param tilec Tile component information (current tile)
55 void dwt_encode(opj_tcd_tilecomp_t * tilec);
57 Inverse 5-3 wavelet tranform in 2-D.
58 Apply a reversible inverse DWT transform to a component of an image.
59 @param tilec Tile component information (current tile)
60 @param numres Number of resolution levels to decode
62 void dwt_decode(opj_tcd_tilecomp_t* tilec, int numres);
64 Get 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
68 int dwt_getgain(int orient);
70 Get 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
75 double dwt_getnorm(int level, int orient);
77 Forward 9-7 wavelet transform in 2-D.
78 Apply an irreversible DWT transform to a component of an image.
79 @param tilec Tile component information (current tile)
81 void dwt_encode_real(opj_tcd_tilecomp_t * tilec);
83 Inverse 9-7 wavelet transform in 2-D.
84 Apply an irreversible inverse DWT transform to a component of an image.
85 @param tilec Tile component information (current tile)
86 @param numres Number of resolution levels to decode
88 void dwt_decode_real(opj_tcd_tilecomp_t* tilec, int numres);
90 Get 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
94 int dwt_getgain_real(int orient);
96 Get 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
101 double dwt_getnorm_real(int level, int orient);
103 Explicit calculation of the Quantization Stepsizes
104 @param tccp Tile-component coding parameters
105 @param prec Precint analyzed
107 void dwt_calc_explicit_stepsizes(opj_tccp_t * tccp, int prec);
108 /* ----------------------------------------------------------------------- */