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41 @brief Implementation of a discrete wavelet transform (DWT)
43 The functions in DWT.C have for goal to realize forward and inverse discret wavelet
44 transform with filter 5-3 (reversible) and filter 9-7 (irreversible). The functions in
45 DWT.C are used by some function in TCD.C.
48 /** @defgroup DWT DWT - Implementation of a discrete wavelet transform */
56 typedef struct opj_wtfilt {
62 /** @name Funciones generales */
64 /* ----------------------------------------------------------------------- */
66 Forward 5-3 wavelet transform in 3-D.
67 Apply a reversible DWT transform to a component of an volume.
68 @param tilec Tile component information (current tile)
69 @param dwtid Number of identification of wavelet kernel(s) used in DWT in each direction
71 void dwt_encode(opj_tcd_tilecomp_t * tilec, int dwtid[3]);
73 Inverse 5-3 wavelet transform in 3-D.
74 Apply a reversible inverse DWT transform to a component of an volume.
75 @param tilec Tile component information (current tile)
76 @param stops Number of decoded resolution levels in each dimension
77 @param dwtid Number of identification of wavelet kernel(s) used in DWT in each dimension
79 void dwt_decode(opj_tcd_tilecomp_t * tilec, int stops[3], int dwtid[3]);
80 /* ----------------------------------------------------------------------- */
82 Get the gain of a subband for the reversible 3-D DWT.
83 @param orient Number that identifies the subband (0->LLL, 1->HLL, 2->LHL, 3->HHL, 4->LLH, 5->HLH, 6->LHH, 7->HHH)
84 @param reversible Wavelet transformation type
85 @return Returns 0 if orient = 0, returns 1 if orient = 1,2 or 4, returns 2 if orient = 3,5 or 6, returns 3 otherwise
87 int dwt_getgain(int orient, int reversible);
89 Get the norm of a wavelet function of a subband at a specified level for the reversible 5-3 DWT or irreversible 9-7 in 3-D.
90 @param orient Band of the wavelet function
91 @param level Levels of the wavelet function in X,Y,Z axis
92 @param dwtid Wavelet transformation identifier
93 @return Returns the norm of the wavelet function
95 double dwt_getnorm(int orient, int level[3], int dwtid[3]);
96 /* ----------------------------------------------------------------------- */
98 Calcula el valor del escal�n de cuantificaci�n correspondiente a cada subbanda.
99 @param tccp Tile component coding parameters
100 @param prec Precision of data
102 void dwt_calc_explicit_stepsizes(opj_tccp_t * tccp, int prec);