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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 void dwt_encode(opj_tcd_tilecomp_t * tilec);
63 Inverse 5-3 wavelet transform in 2-D.
64 Apply a reversible inverse DWT transform to a component of an image.
65 @param tilec Tile component information (current tile)
66 @param numres Number of resolution levels to decode
68 void dwt_decode(opj_tcd_tilecomp_t* tilec, int numres);
70 Get the gain of a subband for the reversible 5-3 DWT.
71 @param orient Number that identifies the subband (0->LL, 1->HL, 2->LH, 3->HH)
72 @return Returns 0 if orient = 0, returns 1 if orient = 1 or 2, returns 2 otherwise
74 int dwt_getgain(int orient);
76 Get the norm of a wavelet function of a subband at a specified level for the reversible 5-3 DWT.
77 @param level Level of the wavelet function
78 @param orient Band of the wavelet function
79 @return Returns the norm of the wavelet function
81 double dwt_getnorm(int level, int orient);
83 Forward 9-7 wavelet transform in 2-D.
84 Apply an irreversible DWT transform to a component of an image.
85 @param tilec Tile component information (current tile)
87 void dwt_encode_real(opj_tcd_tilecomp_t * tilec);
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 void dwt_decode_real(opj_tcd_tilecomp_t* tilec, int numres);
96 Get the gain of a subband for the irreversible 9-7 DWT.
97 @param orient Number that identifies the subband (0->LL, 1->HL, 2->LH, 3->HH)
98 @return Returns the gain of the 9-7 wavelet transform
100 int dwt_getgain_real(int orient);
102 Get the norm of a wavelet function of a subband at a specified level for the irreversible 9-7 DWT
103 @param level Level of the wavelet function
104 @param orient Band of the wavelet function
105 @return Returns the norm of the 9-7 wavelet
107 double dwt_getnorm_real(int level, int orient);
109 Explicit calculation of the Quantization Stepsizes
110 @param tccp Tile-component coding parameters
111 @param prec Precint analyzed
113 void dwt_calc_explicit_stepsizes(opj_tccp_t * tccp, int prec);
114 /* ----------------------------------------------------------------------- */