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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 tilec Tile component information (current tile)
61 OPJ_BOOL opj_dwt_encode(opj_tcd_tilecomp_t * tilec);
64 Inverse 5-3 wavelet transform in 2-D.
65 Apply a reversible inverse DWT transform to a component of an image.
67 @param tilec Tile component information (current tile)
68 @param numres Number of resolution levels to decode
70 OPJ_BOOL opj_dwt_decode(opj_tcd_t *p_tcd,
71 opj_tcd_tilecomp_t* tilec,
75 Get the gain of a subband for the reversible 5-3 DWT.
76 @param orient Number that identifies the subband (0->LL, 1->HL, 2->LH, 3->HH)
77 @return Returns 0 if orient = 0, returns 1 if orient = 1 or 2, returns 2 otherwise
79 OPJ_UINT32 opj_dwt_getgain(OPJ_UINT32 orient) ;
81 Get the norm of a wavelet function of a subband at a specified level for the reversible 5-3 DWT.
82 @param level Level of the wavelet function
83 @param orient Band of the wavelet function
84 @return Returns the norm of the wavelet function
86 OPJ_FLOAT64 opj_dwt_getnorm(OPJ_UINT32 level, OPJ_UINT32 orient);
88 Forward 9-7 wavelet transform in 2-D.
89 Apply an irreversible DWT transform to a component of an image.
90 @param tilec Tile component information (current tile)
92 OPJ_BOOL opj_dwt_encode_real(opj_tcd_tilecomp_t * tilec);
94 Inverse 9-7 wavelet transform in 2-D.
95 Apply an irreversible inverse DWT transform to a component of an image.
97 @param tilec Tile component information (current tile)
98 @param numres Number of resolution levels to decode
100 OPJ_BOOL opj_dwt_decode_real(opj_tcd_t *p_tcd,
101 opj_tcd_tilecomp_t* OPJ_RESTRICT tilec,
105 Get the gain of a subband for the irreversible 9-7 DWT.
106 @param orient Number that identifies the subband (0->LL, 1->HL, 2->LH, 3->HH)
107 @return Returns the gain of the 9-7 wavelet transform
109 OPJ_UINT32 opj_dwt_getgain_real(OPJ_UINT32 orient);
111 Get the norm of a wavelet function of a subband at a specified level for the irreversible 9-7 DWT
112 @param level Level of the wavelet function
113 @param orient Band of the wavelet function
114 @return Returns the norm of the 9-7 wavelet
116 OPJ_FLOAT64 opj_dwt_getnorm_real(OPJ_UINT32 level, OPJ_UINT32 orient);
118 Explicit calculation of the Quantization Stepsizes
119 @param tccp Tile-component coding parameters
120 @param prec Precint analyzed
122 void opj_dwt_calc_explicit_stepsizes(opj_tccp_t * tccp, OPJ_UINT32 prec);
123 /* ----------------------------------------------------------------------- */
128 #endif /* OPJ_DWT_H */