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1 #include "dwt.h"
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2 #include "pgm.h"
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3
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4 char *progname;
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5
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6 void usage(void) {
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7 fprintf(stderr, "usage: %s [-a n] [-h] [-n n] [-o file] [-s file] [-v n] -i file file\n\n", progname);
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8 fprintf(stderr, "\t-a n\t\talpha factor\n");
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9 fprintf(stderr, "\t-e n\t\twavelet filtering method\n");
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10 fprintf(stderr, "\t-f n\t\tfilter number\n");
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11 fprintf(stderr, "\t-F file\t\tfilter definition file\n");
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12 fprintf(stderr, "\t-h\t\tprint usage\n");
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13 fprintf(stderr, "\t-i file\t\toriginal image file\n");
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14 fprintf(stderr, "\t-n n\t\twatermark length\n");
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15 fprintf(stderr, "\t-o file\t\textracted signature file\n");
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16 fprintf(stderr, "\t-s file\t\toriginal signature file\n");
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17 fprintf(stderr, "\t-v n\t\tverbosity level\n");
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18 exit(0);
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19 }
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20
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21 int main(int argc, char *argv[]) {
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22
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23 FILE *in = stdin;
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24 FILE *out = stdout;
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25 FILE *orig = NULL;
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26 FILE *sig = NULL;
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27
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28 gray **input_image;
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29 gray **orig_image;
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30
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31 char signature_name[MAXPATHLEN];
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32 char output_name[MAXPATHLEN] = "(stdout)";
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33 char input_name[MAXPATHLEN] = "(stdin)";
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34 char orig_name[MAXPATHLEN];
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35
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36 int c;
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37 int n = 0;
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38 int method = -1;
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39 int filter = 0;
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40 char filter_name[MAXPATHLEN] = "";
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41
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3
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42 int level = 0;
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0
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43 double alpha = 0.0;
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44
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45 int in_rows, in_cols, in_format;
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46 gray in_maxval;
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47 int orig_rows, orig_cols, orig_format;
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48 gray orig_maxval;
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49 int rows, cols;
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50 int row, col;
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51
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52 Image_tree input_dwts;
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53 Image_tree orig_dwts;
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54
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55 int verbose = 0;
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56
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57 progname = argv[0];
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58
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59 pgm_init(&argc, argv); wm_init2();
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60
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61 while ((c = getopt(argc, argv, "a:e:f:F:h?i:n:o:s:v:")) != EOF) {
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62 switch (c) {
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63 case 'a':
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64 alpha = atof(optarg);
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65 if (alpha <= 0.0) {
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66 fprintf(stderr, "%s: alpha factor %f out of range\n", progname, alpha);
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67 exit(1);
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68 }
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69 break;
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70 case 'e':
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71 method = atoi(optarg);
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72 if (method < 0) {
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73 fprintf(stderr, "%s: wavelet filtering method %d out of range\n", progname, method);
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74 exit(1);
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75 }
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76 break;
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77 case 'f':
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78 filter = atoi(optarg);
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79 if (filter <= 0) {
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80 fprintf(stderr, "%s: filter number %d out of range\n", progname, filter);
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81 exit(1);
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82 }
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83 break;
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84 case 'F':
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85 strcpy(filter_name, optarg);
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86 break;
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87 case 'h':
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88 case '?':
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89 usage();
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90 break;
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91 case 'i':
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92 if ((orig = fopen(optarg, "rb")) == NULL) {
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93 fprintf(stderr, "%s: unable to open original image file %s\n", progname, optarg);
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94 exit(1);
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95 }
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96 strcpy(orig_name, optarg);
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97 break;
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98 case 'n':
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99 n = atoi(optarg);
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100 if (n < 1 || n > 1000) {
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101 fprintf(stderr, "%s: watermark length %d out of range\n", progname, n);
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102 exit(1);
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103 }
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104 break;
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105 case 'o':
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106 if ((out = fopen(optarg, "w")) == NULL) {
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107 fprintf(stderr, "%s: unable to open output file %s\n", progname, optarg);
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108 exit(1);
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109 }
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110 strcpy(output_name, optarg);
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111 break;
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112 case 's':
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113 if ((sig = fopen(optarg, "r")) == NULL) {
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114 fprintf(stderr, "%s: unable to open signature file %s\n", progname, optarg);
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115 exit(1);
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116 }
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117 strcpy(signature_name, optarg);
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118 break;
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119 case 'v':
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120 verbose = atoi(optarg);
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121 if (verbose < 0) {
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122 fprintf(stderr, "%s: verbosity level %d out of range\n", progname, verbose);
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123 exit(1);
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124 }
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125 break;
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126 }
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127 }
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128
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129 argc -= optind;
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130 argv += optind;
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131
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132 if (argc > 1) {
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133 usage();
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134 exit(1);
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135 }
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136
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8
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137 if (argc == 1 && *argv[0] != '-') {
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0
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138 if ((in = fopen(argv[0], "rb")) == NULL) {
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139 fprintf(stderr, "%s: unable to open input file %s\n", progname, argv[0]);
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140 exit(1);
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141 }
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142 else
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143 strcpy(input_name, argv[0]);
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8
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144 }
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145
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0
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146 if (!orig) {
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147 fprintf(stderr, "%s: original image file not specified, use -i file option\n", progname);
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148 exit(1);
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149 }
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150
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151 if (sig) {
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152 char line[32];
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153 fgets(line, sizeof(line), sig);
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154 if (strspn(line, "CVSG") >= 4) {
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155 fscanf(sig, "%d\n", &n);
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156 if (alpha == 0.0)
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157 fscanf(sig, "%lf\n", &alpha);
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158 else
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159 fscanf(sig, "%*lf\n");
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160 if (method < 0)
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161 fscanf(sig, "%d\n", &method);
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162 else
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163 fscanf(sig, "%*d\n");
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164 if (filter == 0)
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165 fscanf(sig, "%d\n", &filter);
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166 else
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167 fscanf(sig, "%*d\n");
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168 if (!strcmp(filter_name, ""))
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15
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169 fscanf(sig, "%[^\n\r]\n", filter_name);
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0
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170 else
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171 fscanf(sig, "%*[^\n\r]\n");
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172 }
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173 else {
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174 fprintf(stderr, "%s: invalid signature file %s\n", progname, signature_name);
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175 exit(1);
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176 }
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177 fclose(sig);
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178 }
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179 else {
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180 fprintf(stderr, "%s: signature file not specified, use -s file option\n", progname);
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181 exit(1);
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182 }
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183
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184 pgm_readpgminit(in, &in_cols, &in_rows, &in_maxval, &in_format);
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185 pgm_readpgminit(orig, &orig_cols, &orig_rows, &orig_maxval, &orig_format);
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186
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187 if (in_cols != orig_cols || in_rows != orig_rows) {
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188 fprintf(stderr, "%s: input image %s does not match dimensions of original image %s\n", progname, input_name, orig_name);
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189 exit(1);
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190 }
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191
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192 cols = in_cols;
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193 rows = in_rows;
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194
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195 input_image = pgm_allocarray(in_cols, in_rows);
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196
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197 orig_image = pgm_allocarray(orig_cols, orig_rows);
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198
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199 for (row = 0; row < in_rows; row++)
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200 pgm_readpgmrow(in, input_image[row], in_cols, in_maxval, in_format);
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201
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202 fclose(in);
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203
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204 for (row = 0; row < orig_rows; row++)
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205 pgm_readpgmrow(orig, orig_image[row], orig_cols, orig_maxval, orig_format);
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206
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207 fclose(orig);
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208
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209 level = 0;
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210 row = rows;
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211 col = cols;
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212 while (n < row * col / 4.0 && row >= 2 && col >= 2) {
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213 row /= 2;
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214 col /= 2;
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215 level++;
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216 }
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217
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218 if (verbose >= 2) {
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219 fprintf(stderr, "%s: extracting from coarse image (x %d/y %d) at level %d\n", progname, col, row, level);
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220 }
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221
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222 init_dwt(cols, rows, filter_name, filter, level, method);
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223 #ifdef POLLEN_STUFF
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3
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224 #include "pollen_stuff.c"
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0
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225 #endif
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226 #ifdef PARAM_STUFF
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3
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227 #include "param_stuff.c"
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0
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228 #endif
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229
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230 input_dwts = fdwt(input_image);
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231 orig_dwts = fdwt(orig_image);
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232
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233 fprintf(out, "CVWM\n");
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234 fprintf(out, "%d\n", n);
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235
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236 {
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237 Image_tree p = input_dwts;
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238 Image_tree q = orig_dwts;
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239 Image input_img;
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240 Image orig_img;
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241 double input_med;
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242 double orig_med;
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243 double input_var;
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244 double orig_var;
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245
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246 while (!p->image)
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247 p = p->coarse;
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248
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249 while (!q->image)
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250 q = q->coarse;
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251
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252 input_img = p->image;
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253 orig_img = q->image;
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254
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255 input_med = 0.0;
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256 for (row = 0; row < input_img->height; row++)
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257 for (col = 0; col < input_img->width; col++)
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258 input_med += get_pixel(input_img, col, row);
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259 input_med /= (double) (input_img->height * input_img->width);
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260
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261 orig_med = 0.0;
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262 for (row = 0; row < orig_img->height; row++)
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263 for (col = 0; col < orig_img->width; col++)
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264 orig_med += get_pixel(orig_img, col, row);
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265 orig_med /= (double) (orig_img->height * orig_img->width);
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266
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267 orig_var = 0.0;
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268 for (row = 0; row < orig_img->height; row++)
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269 for (col = 0; col < orig_img->width; col++)
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270 orig_var += sqr(get_pixel(orig_img, col, row) - orig_med);
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271 orig_var /= (double) (orig_img->height * orig_img->width);
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272
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273 input_var = 0.0;
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274 for (row = 0; row < input_img->height; row++)
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275 for (col = 0; col < input_img->width; col++)
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276 input_var += sqr(get_pixel(input_img, col, row) - input_med);
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277 input_var /= (double) (input_img->height * input_img->width);
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278
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279 orig_var = sqrt(orig_var);
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280 input_var = sqrt(input_var);
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281
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282 if (verbose > 3)
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283 fprintf(stderr, "%s: mean (input, orig): %f, %f,\n variance (input, orig): %f, %f\n", progname, input_med, orig_med, input_var, orig_var);
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284
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285 row = 0;
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286 col = 0;
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287 while (n > 0) {
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288 double input_pix;
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289 double orig_pix;
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290 double x;
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291
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292 input_pix = get_pixel(input_img, col, row);
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293 orig_pix = get_pixel(orig_img, col, row);
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294
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295 x = (((input_pix - input_med) * (orig_var / input_var) - (orig_pix / orig_med)) / (orig_pix - orig_med) - 1.0) / alpha;
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296
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297 fprintf(out, "%f\n", x);
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298
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299 if (++col == orig_img->width) { col = 0; row++; }
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300 n--;
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301 }
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302 }
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303
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304 fclose(out);
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305
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306 pgm_freearray(input_image, rows);
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307 pgm_freearray(orig_image, rows);
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308
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309 exit(0);
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310 }
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