2 * Copyright (c) 2001-2003, David Janssens
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3 * Copyright (c) 2002-2003, Yannick Verschueren
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4 * Copyright (c) 2003-2005, Francois Devaux and Antonin Descampe
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5 * Copyright (c) 2005, Herve Drolon, FreeImage Team
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6 * Copyright (c) 2002-2005, Communications and remote sensing Laboratory, Universite catholique de Louvain, Belgium
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7 * Copyrigth (c) 2006, M�nica D�ez, LPI-UVA, Spain
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8 * All rights reserved.
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10 * Redistribution and use in source and binary forms, with or without
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11 * modification, are permitted provided that the following conditions
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13 * 1. Redistributions of source code must retain the above copyright
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14 * notice, this list of conditions and the following disclaimer.
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15 * 2. Redistributions in binary form must reproduce the above copyright
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17 * documentation and/or other materials provided with the distribution.
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19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
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20 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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22 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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23 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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29 * POSSIBILITY OF SUCH DAMAGE.
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36 @brief Implementation of a discrete wavelet transform (DWT)
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38 The functions in DWT.C have for goal to realize forward and inverse discret wavelet
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39 transform with filter 5-3 (reversible) and filter 9-7 (irreversible). The functions in
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40 DWT.C are used by some function in TCD.C.
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43 /** @defgroup DWT DWT - Implementation of a discrete wavelet transform */
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47 DCCS-LIWT properties
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51 typedef struct opj_wtfilt {
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57 /** @name Funciones generales */
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59 /* ----------------------------------------------------------------------- */
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61 Forward 5-3 wavelet tranform in 3-D.
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62 Apply a reversible DWT transform to a component of an volume.
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63 @param tilec Tile component information (current tile)
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64 @param dwtid Number of identification of wavelet kernel(s) used in DWT in each direction
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66 void dwt_encode(opj_tcd_tilecomp_t * tilec, int dwtid[3]);
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68 Inverse 5-3 wavelet tranform in 3-D.
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69 Apply a reversible inverse DWT transform to a component of an volume.
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70 @param tilec Tile component information (current tile)
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71 @param stops Number of decoded resolution levels in each dimension
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72 @param dwtid Number of identification of wavelet kernel(s) used in DWT in each dimension
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74 void dwt_decode(opj_tcd_tilecomp_t * tilec, int stops[3], int dwtid[3]);
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75 /* ----------------------------------------------------------------------- */
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77 Get the gain of a subband for the reversible 3-D DWT.
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78 @param orient Number that identifies the subband (0->LLL, 1->HLL, 2->LHL, 3->HHL, 4->LLH, 5->HLH, 6->LHH, 7->HHH)
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79 @param reversible Wavelet transformation type
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80 @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
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82 int dwt_getgain(int orient, int reversible);
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84 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.
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85 @param orient Band of the wavelet function
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86 @param level Levels of the wavelet function in X,Y,Z axis
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87 @param dwtid Wavelet transformation identifier
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88 @return Returns the norm of the wavelet function
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90 double dwt_getnorm(int orient, int level[3], int dwtid[3]);
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91 /* ----------------------------------------------------------------------- */
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93 Calcula el valor del escal�n de cuantificaci�n correspondiente a cada subbanda.
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94 @param tccp Tile component coding parameters
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95 @param prec Precision of data
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97 void dwt_calc_explicit_stepsizes(opj_tccp_t * tccp, int prec);
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100 #endif /* __DWT_H */
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