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4680 | right-hear | 1 | /* |
2 | * Copyright (c) 2002-2007, Communications and Remote Sensing Laboratory, Universite catholique de Louvain (UCL), Belgium |
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3 | * Copyright (c) 2002-2007, Professor Benoit Macq |
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4 | * Copyright (c) 2001-2003, David Janssens |
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5 | * Copyright (c) 2002-2003, Yannick Verschueren |
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6 | * Copyright (c) 2003-2007, Francois-Olivier Devaux and Antonin Descampe |
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7 | * Copyright (c) 2005, Herve Drolon, FreeImage Team |
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8 | * All rights reserved. |
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9 | * |
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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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12 | * are met: |
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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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16 | * notice, this list of conditions and the following disclaimer in the |
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17 | * documentation and/or other materials provided with the distribution. |
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18 | * |
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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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24 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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25 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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26 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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27 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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28 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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29 | * POSSIBILITY OF SUCH DAMAGE. |
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30 | */ |
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31 | |||
32 | #ifndef __DWT_H |
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33 | #define __DWT_H |
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34 | /** |
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35 | @file dwt.h |
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36 | @brief Implementation of a discrete wavelet transform (DWT) |
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37 | |||
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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41 | */ |
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42 | |||
43 | /** @defgroup DWT DWT - Implementation of a discrete wavelet transform */ |
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44 | /*@{*/ |
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45 | |||
46 | |||
47 | /** @name Exported functions */ |
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48 | /*@{*/ |
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49 | /* ----------------------------------------------------------------------- */ |
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50 | /** |
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51 | Forward 5-3 wavelet tranform in 2-D. |
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52 | Apply a reversible DWT transform to a component of an image. |
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53 | @param tilec Tile component information (current tile) |
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54 | */ |
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55 | void dwt_encode(opj_tcd_tilecomp_t * tilec); |
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56 | /** |
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57 | Inverse 5-3 wavelet tranform in 2-D. |
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58 | Apply a reversible inverse DWT transform to a component of an image. |
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59 | @param tilec Tile component information (current tile) |
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60 | @param numres Number of resolution levels to decode |
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61 | */ |
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62 | void dwt_decode(opj_tcd_tilecomp_t* tilec, int numres); |
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63 | /** |
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64 | Get the gain of a subband for the reversible 5-3 DWT. |
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65 | @param orient Number that identifies the subband (0->LL, 1->HL, 2->LH, 3->HH) |
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66 | @return Returns 0 if orient = 0, returns 1 if orient = 1 or 2, returns 2 otherwise |
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67 | */ |
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68 | int dwt_getgain(int orient); |
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69 | /** |
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70 | Get the norm of a wavelet function of a subband at a specified level for the reversible 5-3 DWT. |
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71 | @param level Level of the wavelet function |
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72 | @param orient Band of the wavelet function |
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73 | @return Returns the norm of the wavelet function |
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74 | */ |
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75 | double dwt_getnorm(int level, int orient); |
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76 | /** |
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77 | Forward 9-7 wavelet transform in 2-D. |
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78 | Apply an irreversible DWT transform to a component of an image. |
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79 | @param tilec Tile component information (current tile) |
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80 | */ |
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81 | void dwt_encode_real(opj_tcd_tilecomp_t * tilec); |
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82 | /** |
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83 | Inverse 9-7 wavelet transform in 2-D. |
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84 | Apply an irreversible inverse DWT transform to a component of an image. |
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85 | @param tilec Tile component information (current tile) |
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86 | @param numres Number of resolution levels to decode |
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87 | */ |
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88 | void dwt_decode_real(opj_tcd_tilecomp_t* tilec, int numres); |
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89 | /** |
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90 | Get the gain of a subband for the irreversible 9-7 DWT. |
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91 | @param orient Number that identifies the subband (0->LL, 1->HL, 2->LH, 3->HH) |
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92 | @return Returns the gain of the 9-7 wavelet transform |
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93 | */ |
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94 | int dwt_getgain_real(int orient); |
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95 | /** |
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96 | Get the norm of a wavelet function of a subband at a specified level for the irreversible 9-7 DWT |
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97 | @param level Level of the wavelet function |
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98 | @param orient Band of the wavelet function |
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99 | @return Returns the norm of the 9-7 wavelet |
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100 | */ |
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101 | double dwt_getnorm_real(int level, int orient); |
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102 | /** |
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103 | Explicit calculation of the Quantization Stepsizes |
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104 | @param tccp Tile-component coding parameters |
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105 | @param prec Precint analyzed |
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106 | */ |
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107 | void dwt_calc_explicit_stepsizes(opj_tccp_t * tccp, int prec); |
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108 | /* ----------------------------------------------------------------------- */ |
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109 | /*@}*/ |
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110 | |||
111 | /*@}*/ |
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112 | |||
113 | #endif /* __DWT_H */ |