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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 gain of a subband for the reversible 5-3 DWT.
78 @param orient Number that identifies the subband (0->LL, 1->HL, 2->LH, 3->HH)
79 @return Returns 0 if orient = 0, returns 1 if orient = 1 or 2, returns 2 otherwise
81 OPJ_UINT32 opj_dwt_getgain(OPJ_UINT32 orient) ;
83 Get the norm of a wavelet function of a subband at a specified level for the reversible 5-3 DWT.
84 @param level Level of the wavelet function
85 @param orient Band of the wavelet function
86 @return Returns the norm of the wavelet function
88 OPJ_FLOAT64 opj_dwt_getnorm(OPJ_UINT32 level, OPJ_UINT32 orient);
90 Forward 9-7 wavelet transform in 2-D.
91 Apply an irreversible DWT transform to a component of an image.
92 @param p_tcd TCD handle
93 @param tilec Tile component information (current tile)
95 OPJ_BOOL opj_dwt_encode_real(opj_tcd_t *p_tcd,
96 opj_tcd_tilecomp_t * tilec);
98 Inverse 9-7 wavelet transform in 2-D.
99 Apply an irreversible inverse DWT transform to a component of an image.
100 @param p_tcd TCD handle
101 @param tilec Tile component information (current tile)
102 @param numres Number of resolution levels to decode
104 OPJ_BOOL opj_dwt_decode_real(opj_tcd_t *p_tcd,
105 opj_tcd_tilecomp_t* OPJ_RESTRICT tilec,
109 Get the gain of a subband for the irreversible 9-7 DWT.
110 @param orient Number that identifies the subband (0->LL, 1->HL, 2->LH, 3->HH)
111 @return Returns the gain of the 9-7 wavelet transform
113 OPJ_UINT32 opj_dwt_getgain_real(OPJ_UINT32 orient);
115 Get the norm of a wavelet function of a subband at a specified level for the irreversible 9-7 DWT
116 @param level Level of the wavelet function
117 @param orient Band of the wavelet function
118 @return Returns the norm of the 9-7 wavelet
120 OPJ_FLOAT64 opj_dwt_getnorm_real(OPJ_UINT32 level, OPJ_UINT32 orient);
122 Explicit calculation of the Quantization Stepsizes
123 @param tccp Tile-component coding parameters
124 @param prec Precint analyzed
126 void opj_dwt_calc_explicit_stepsizes(opj_tccp_t * tccp, OPJ_UINT32 prec);
127 /* ----------------------------------------------------------------------- */
132 #endif /* OPJ_DWT_H */