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
63 void dwt_decode(opj_tcd_tilecomp_t* tilec, int numres);
65 opj_bool dwt_decode(opj_tcd_tilecomp_t* tilec, OPJ_UINT32 numres);
69 Get the gain of a subband for the reversible 5-3 DWT.
70 @param orient Number that identifies the subband (0->LL, 1->HL, 2->LH, 3->HH)
71 @return Returns 0 if orient = 0, returns 1 if orient = 1 or 2, returns 2 otherwise
73 int dwt_getgain(int orient);
75 Get the norm of a wavelet function of a subband at a specified level for the reversible 5-3 DWT.
76 @param level Level of the wavelet function
77 @param orient Band of the wavelet function
78 @return Returns the norm of the wavelet function
80 double dwt_getnorm(int level, int orient);
82 Forward 9-7 wavelet transform in 2-D.
83 Apply an irreversible DWT transform to a component of an image.
84 @param tilec Tile component information (current tile)
86 void dwt_encode_real(opj_tcd_tilecomp_t * tilec);
88 KEEP TRUNK VERSION + return type of v2 because rev557
89 Inverse 9-7 wavelet transform in 2-D.
90 Apply an irreversible inverse DWT transform to a component of an image.
91 @param tilec Tile component information (current tile)
92 @param numres Number of resolution levels to decode
94 // V1 void dwt_decode_real(opj_tcd_tilecomp_t* tilec, int numres);
95 opj_bool dwt_decode_real(opj_tcd_tilecomp_t* tilec, int numres);
97 Get the gain of a subband for the irreversible 9-7 DWT.
98 @param orient Number that identifies the subband (0->LL, 1->HL, 2->LH, 3->HH)
99 @return Returns the gain of the 9-7 wavelet transform
101 int dwt_getgain_real(int orient);
103 Get the norm of a wavelet function of a subband at a specified level for the irreversible 9-7 DWT
104 @param level Level of the wavelet function
105 @param orient Band of the wavelet function
106 @return Returns the norm of the 9-7 wavelet
108 double dwt_getnorm_real(int level, int orient);
110 Explicit calculation of the Quantization Stepsizes
111 @param tccp Tile-component coding parameters
112 @param prec Precint analyzed
114 void dwt_calc_explicit_stepsizes(opj_tccp_t * tccp, int prec);
115 /* ----------------------------------------------------------------------- */