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42 @brief Implementation of a discrete wavelet transform (DWT)
44 The functions in DWT.C have for goal to realize forward and inverse discret wavelet
45 transform with filter 5-3 (reversible) and filter 9-7 (irreversible). The functions in
46 DWT.C are used by some function in TCD.C.
49 /** @defgroup DWT DWT - Implementation of a discrete wavelet transform */
53 /** @name Exported functions */
55 /* ----------------------------------------------------------------------- */
57 Forward 5-3 wavelet transform in 2-D.
58 Apply a reversible DWT transform to a component of an image.
59 @param p_tcd TCD handle
60 @param tilec Tile component information (current tile)
62 OPJ_BOOL opj_dwt_encode(opj_tcd_t *p_tcd,
63 opj_tcd_tilecomp_t * tilec);
66 Inverse 5-3 wavelet transform in 2-D.
67 Apply a reversible inverse DWT transform to a component of an image.
68 @param p_tcd TCD handle
69 @param tilec Tile component information (current tile)
70 @param numres Number of resolution levels to decode
72 OPJ_BOOL opj_dwt_decode(opj_tcd_t *p_tcd,
73 opj_tcd_tilecomp_t* tilec,
77 Get the norm of a wavelet function of a subband at a specified level for the reversible 5-3 DWT.
78 @param level Level of the wavelet function
79 @param orient Band of the wavelet function
80 @return Returns the norm of the wavelet function
82 OPJ_FLOAT64 opj_dwt_getnorm(OPJ_UINT32 level, OPJ_UINT32 orient);
84 Forward 9-7 wavelet transform in 2-D.
85 Apply an irreversible DWT transform to a component of an image.
86 @param p_tcd TCD handle
87 @param tilec Tile component information (current tile)
89 OPJ_BOOL opj_dwt_encode_real(opj_tcd_t *p_tcd,
90 opj_tcd_tilecomp_t * tilec);
92 Inverse 9-7 wavelet transform in 2-D.
93 Apply an irreversible inverse DWT transform to a component of an image.
94 @param p_tcd TCD handle
95 @param tilec Tile component information (current tile)
96 @param numres Number of resolution levels to decode
98 OPJ_BOOL opj_dwt_decode_real(opj_tcd_t *p_tcd,
99 opj_tcd_tilecomp_t* OPJ_RESTRICT tilec,
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 OPJ_FLOAT64 opj_dwt_getnorm_real(OPJ_UINT32 level, OPJ_UINT32 orient);
110 Explicit calculation of the Quantization Stepsizes
111 @param tccp Tile-component coding parameters
112 @param prec Precint analyzed
114 void opj_dwt_calc_explicit_stepsizes(opj_tccp_t * tccp, OPJ_UINT32 prec);
115 /* ----------------------------------------------------------------------- */
120 #endif /* OPJ_DWT_H */