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1 #include "wm.h"
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2 #include "dwt.h"
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3
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4 char filter_file[MAXPATHLEN] = "";
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5 AllFilters dwt_allfilters;
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6 FilterGH *dwt_filters = NULL;
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7 int dwt_method;
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8 int dwt_cols;
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9 int dwt_rows;
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10 int dwt_levels;
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11 int dwt_filter;
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12
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13 void init_dwt(int cols, int rows, const char *filter_name, int filter, int level, int method) {
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14 int i;
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15
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16 if (strcmp(filter_file, filter_name)) {
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17 if (filter_name)
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18 strcpy(filter_file, filter_name);
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19 else
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20 strcpy(filter_file, "filter.dat");
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3
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21
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0
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22 /* memory leak here - there is no function unload_filters() */
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23 dwt_allfilters = load_filters(filter_file);
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3
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24
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0
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25 if (!dwt_allfilters) {
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26 fprintf(stderr, "init_dwt(): unable to open filter definition file %s\n", filter_file);
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27 return;
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28 }
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29 }
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30
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31 #ifdef DEBUG
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32 if (level <= 0 || level > rint(log(MIN(cols, rows))/log(2.0)) - 2) {
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33 fprintf(stderr, "init_dwt(): level parameter does not match image width/height\n");
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34 return;
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35 }
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36 #endif
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37
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38 if (dwt_filters && level != dwt_levels) {
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39 free(dwt_filters);
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40 dwt_filters = NULL;
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41 }
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42
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43 dwt_levels = level;
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44
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45 if (!dwt_filters)
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46 dwt_filters = calloc(level + 1, sizeof(FilterGH));
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47
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48 for (i = 0; i < level + 1; i++)
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49 dwt_filters[i] = (dwt_allfilters->filter)[filter];
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50
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51 dwt_filter = filter;
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52 dwt_method = method;
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53 dwt_cols = cols;
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54 dwt_rows = rows;
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55 }
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56
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57 Image_tree fdwt(gray **pixels) {
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58 Image image;
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59 Image_tree tree;
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60 int i, j;
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61
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62 image = new_image(dwt_cols, dwt_rows);
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63
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64 for (i = 0; i < dwt_rows; i++)
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65 for (j = 0; j < dwt_cols; j++)
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66 set_pixel(image, j, i, pixels[i][j]);
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67
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68 tree = wavelettransform(image, dwt_levels, dwt_filters, dwt_method);
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69 free_image(image);
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70
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71 return tree;
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72 }
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73
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74 Image_tree fdwt_wp(gray **pixels) {
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75 Image image;
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76 Image_tree tree;
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77 int i, j;
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78
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79 image = new_image(dwt_cols, dwt_rows);
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80
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81 for (i = 0; i < dwt_rows; i++)
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82 for (j = 0; j < dwt_cols; j++)
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83 set_pixel(image, j, i, pixels[i][j]);
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84
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85 tree = wavelettransform_wp(image, dwt_levels, dwt_filters, dwt_method);
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86 free_image(image);
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87
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88 return tree;
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89 }
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90
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91 void idwt(Image_tree dwts, gray **pixels) {
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92 Image image;
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93 int i, j;
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94
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95 image = inv_transform(dwts, dwt_filters, dwt_method + 1);
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96
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97 for (i = 0; i < dwt_rows; i++)
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98 for (j = 0; j < dwt_cols; j++)
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99 pixels[i][j] = PIXELRANGE((int) (get_pixel(image, j, i) + 0.5));
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100
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101 free_image(image);
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102 }
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103
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104 void idwt_wp(Image_tree dwts, gray **pixels) {
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105 Image image;
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106 int i, j;
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107
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108 image = inv_transform(dwts, dwt_filters, dwt_method + 1);
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109
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110 for (i = 0; i < dwt_rows; i++)
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111 for (j = 0; j < dwt_cols; j++)
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112 pixels[i][j] = PIXELRANGE((int) (get_pixel(image, j, i) + 0.5));
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113
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114 free_image(image);
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115 }
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116
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117 int gen_pollen_filter(double *filter, double alpha, double beta, int which) {
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118 int i, j, k, filterlength;
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119 double tf[6];
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120
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121 /* parameter alpha, beta have to be in range -Pi .. Pi */
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122 if (alpha < -M_PI || alpha >= M_PI) {
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123 fprintf(stderr, "alpha %f out of range\n", alpha);
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124 return -1;
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125 }
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126
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127 if (beta < -M_PI || beta >= M_PI) {
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128 fprintf(stderr, "beta %f out of range\n", beta);
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129 return -1;
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130 }
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131
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132 /* generate Pollen filter coefficients, see http://www.dfw.net/~cody for details */
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133 tf[0] = ((1.0 + cos(alpha) + sin(alpha)) * (1.0 - cos(beta) - sin(beta)) + 2.0 * sin(beta) * cos(alpha)) / 4.0;
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134 tf[1] = ((1.0 - cos(alpha) + sin(alpha)) * (1.0 + cos(beta) - sin(beta)) - 2.0 * sin(beta) * cos(alpha)) / 4.0;
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135 tf[2] = (1.0 + cos(alpha - beta) + sin(alpha - beta)) / 2.0;
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136 tf[3] = (1.0 + cos(alpha - beta) - sin(alpha - beta)) / 2.0;
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137 tf[4] = 1.0 - tf[0] - tf[2];
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138 tf[5] = 1.0 - tf[1] - tf[3];
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139
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140 /* set close-to-zero filter coefficients to zero */
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141 for (i = 0; i < 6; i++)
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142 if (fabs(tf[i]) < 1.0e-15) tf[i] = 0.0;
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143
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144 /* find the first non-zero wavelet coefficient */
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145 i = 0;
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146 while (tf[i] == 0.0) i++;
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147
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148 /* find the last non-zero wavelet coefficient */
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149 j = 5;
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150 while (tf[j] == 0.0) j--;
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151
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152 filterlength = j - i + 1;
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153 for (k = 0; k < filterlength; k++)
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154 switch (which) {
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155 case FILTERH:
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156 filter[k] = tf[j--] / 2.0;
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157 break;
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158 case FILTERG:
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159 filter[k] = (double) (((i & 0x01) * 2) - 1) * tf[i++] / 2.0;
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160 break;
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161 case FILTERHi:
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162 filter[k] = tf[j--];
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163 break;
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164 case FILTERGi:
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165 filter[k] = (double) (((i & 0x01) * 2) - 1) * tf[i++];
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166 break;
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167 default:
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168 return -1;
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169 }
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170
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171 while (k < 6)
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172 filter[k++] = 0.0;
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173
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174 return filterlength;
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175 }
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176
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177 void dwt_pollen_filter(double alpha, double beta) {
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178 FilterGH filter;
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179 int i;
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180
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181 filter = malloc(sizeof(struct FilterGHStruct));
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182 #ifdef DEBUG
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183 if (!filter) {
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184 fprintf(stderr, "dwt_pollen_filter(): malloc failed()\n");
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185 return;
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186 }
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187 #endif
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188
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189 filter->type = FTOther;
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190 filter->name = "pollen";
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191
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192 filter->g = new_filter(6);
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193 filter->g->type = FTSymm;
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194 filter->g->hipass = 1;
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195 filter->g->len = gen_pollen_filter(filter->g->data, alpha, beta, FILTERG);
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196 filter->g->start = -filter->g->len / 2;
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197 filter->g->end = filter->g->len / 2 - 1;
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198
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199 filter->h = new_filter(6);
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200 filter->h->type = FTSymm;
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201 filter->h->hipass = 0;
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202 filter->h->len = gen_pollen_filter(filter->h->data, alpha, beta, FILTERH);
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203 filter->h->start = -filter->h->len / 2;
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204 filter->h->end = filter->h->len / 2 - 1;
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205
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206 filter->gi = new_filter(6);
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207 filter->gi->type = FTSymm;
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208 filter->gi->hipass = 1;
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209 filter->gi->len = gen_pollen_filter(filter->gi->data, alpha, beta, FILTERGi);
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210 filter->gi->start = -filter->gi->len / 2;
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211 filter->gi->end = filter->gi->len / 2 - 1;
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212
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213 filter->hi = new_filter(6);
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214 filter->hi->type = FTSymm;
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215 filter->hi->hipass = 0;
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216 filter->hi->len = gen_pollen_filter(filter->hi->data, alpha, beta, FILTERHi);
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217 filter->hi->start = -filter->hi->len / 2;
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218 filter->hi->end = filter->hi->len / 2 - 1;
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219
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220 #ifdef DEBUG
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221 if (dwt_levels <= 0) {
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222 fprintf(stderr, "dwt_pollen_filter(): level invalid - set to zero\n");
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223 return;
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224 }
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225 #endif
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226
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227 #ifdef DEBUG
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228 if (!dwt_filters) {
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229 fprintf(stderr, "dwt_pollen_filter(): wm_dwt not initialized, call init_dwt() first\n");
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230 return;
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231 }
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232 #endif
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233
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234 for (i = 0; i < dwt_levels + 1; i++)
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235 dwt_filters[i] = filter;
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236 }
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237
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238 int gen_param_filter(double *filter, int n, double alpha[], int which) {
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239 int i, j, k, filterlength;
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240 double *tf, *t;
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241
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242 tf = malloc(2 * (n + 1) * sizeof(double));
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243 t = malloc(2 * (n + 1) * sizeof(double));
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244 if (!tf) {
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245 fprintf(stderr, "gen_param_filter(): malloc() failed\n");
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246 return -1;
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247 }
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248
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249 tf[0] = 1.0 / sqrt(2.0);
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250 tf[1] = 1.0 / sqrt(2.0);
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251
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252 for (k = 0; k < n; k++) {
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253 for (i = 0; i < 2 * (k + 2); i++) {
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254
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255 #define H(X) (((X) < 0 || (X) >= 2 * (k + 1)) ? 0.0 : tf[X])
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256
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257 t[i] = 0.5 * (H(i - 2) + H(i) +
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258 cos(alpha[k]) * (H(i - 2) - H(i)) +
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259 (i & 1 ? -1.0 : 1.0) * sin(alpha[k]) * (H(2 * (k + 2) - i - 1) - H(2 * (k + 2) - i - 3)));
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260 }
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261 for (i = 0; i < 2 * (k + 2); i++) tf[i] = t[i];
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262 }
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263
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264 /* set close-to-zero filter coefficients to zero */
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265 for (i = 0; i < 2 * (n + 1) ; i++)
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266 if (fabs(tf[i]) < 1.0e-15) tf[i] = 0.0;
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267
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268 /* find the first non-zero wavelet coefficient */
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269 i = 0;
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270 while (tf[i] == 0.0) i++;
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271
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272 /* find the last non-zero wavelet coefficient */
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273 j = 2 * (n + 1) - 1;
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274 while (tf[j] == 0.0) j--;
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275
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276 filterlength = j - i + 1;
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277 for (k = 0; k < filterlength; k++)
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278 switch (which) {
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279 case FILTERG:
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280 case FILTERGi:
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8
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281 filter[k] = (double) ((((i+1) & 0x01) * 2) - 1) * tf[i++];
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0
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282 break;
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283 case FILTERH:
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284 case FILTERHi:
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285 filter[k] = tf[j--];
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286 break;
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287 default:
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288 return -1;
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289 }
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290
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291 while (k < 2 * (n + 1))
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292 filter[k++] = 0.0;
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293
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294 return filterlength;
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295 }
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296
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3
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297 void dwt_param_filter(double alpha[], int param_len[]) {
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0
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298 FilterGH filter;
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299 int i;
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3
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300 int param_len_sum = 0;
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0
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301
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302 #ifdef DEBUG
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303 if (dwt_levels <= 0) {
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3
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304 fprintf(stderr, "dwt_param_filter(): level invalid - set to zero\n");
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0
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305 return;
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306 }
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307 #endif
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308
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309 #ifdef DEBUG
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310 if (!dwt_filters) {
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3
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311 fprintf(stderr, "dwt_param_filter(): wm_dwt not initialized, call init_dwt() first\n");
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0
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312 return;
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313 }
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314 #endif
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315
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3
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316
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317 for (i = 0; i < dwt_levels + 1; i++) {
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318
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319 filter = malloc(sizeof(struct FilterGHStruct));
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320 #ifdef DEBUG
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321 if (!filter) {
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322 fprintf(stderr, "dwt_param_filter(): malloc failed()\n");
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323 return;
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324 }
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325 #endif
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326
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327 filter->type = FTOrtho;
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328 filter->name = "param";
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329
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330 filter->g = new_filter(2 * (param_len[i] + 1));
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331 filter->g->type = FTSymm;
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332 filter->g->hipass = 1;
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333 filter->g->len = gen_param_filter(filter->g->data,
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334 param_len[i], &alpha[param_len_sum],
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335 FILTERG);
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336 filter->g->start = -filter->g->len / 2;
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337 filter->g->end = filter->g->len / 2 - 1;
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338
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339 filter->h = new_filter(2 * (param_len[i] + 1));
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340 filter->h->type = FTSymm;
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341 filter->h->hipass = 0;
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342 filter->h->len = gen_param_filter(filter->h->data,
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343 param_len[i], &alpha[param_len_sum],
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344 FILTERH);
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345 filter->h->start = -filter->h->len / 2;
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346 filter->h->end = filter->h->len / 2 - 1;
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347
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348 filter->gi = 0;
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349 filter->hi = 0;
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350
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0
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351 dwt_filters[i] = filter;
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3
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352
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353 param_len_sum += param_len[i];
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354 }
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0
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355 }
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356
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357 void done_dwt() {
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358 }
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