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1 #include "wm.h"
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2 #include "dwt.h"
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3 #include "pgm.h"
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4 #include "sort.h"
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5
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6 char *progname;
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7
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8 void usage(void) {
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9 fprintf(stderr, "usage: %s [-a n] [-e n] [-f n] [-F n] [-h] [-l n] [-o file] [-v n] -s file file\n\n", progname);
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10 fprintf(stderr, "\t-a n\t\talpha factor/embedding strength\n");
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11 fprintf(stderr, "\t-e n\t\twavelet filtering method\n");
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12 fprintf(stderr, "\t-f n\t\tfilter number\n");
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13 fprintf(stderr, "\t-F file\t\tfilter definition file\n");
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14 fprintf(stderr, "\t-h\t\tprint usage\n");
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15 fprintf(stderr, "\t-l n\t\tdecomposition level\n");
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16 fprintf(stderr, "\t-o file\t\toutput (watermarked) file\n");
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17 fprintf(stderr, "\t-s file\t\tsignature to embed in input image\n");
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18 fprintf(stderr, "\t-v n\t\tverbosity level\n");
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19 exit(0);
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20 }
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21
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22 int main(int argc, char *argv[]) {
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23
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24 FILE *in = stdin;
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25 FILE *out = stdout;
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26 FILE *sig = NULL;
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27
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28 char output_name[MAXPATHLEN] = "(stdout)";
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29 char input_name[MAXPATHLEN] = "(stdin)";
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30 char signature_name[MAXPATHLEN];
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31
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32 int i, c, w;
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8
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33 int row;
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0
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34
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35 int n;
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36
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37 double alpha = 0.0;
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38 int level = 0;
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39
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40 int filter = 0;
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41 int method = -1;
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42 int levels;
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43 char filter_name[MAXPATHLEN] = "";
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44
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45 int verbose = 0;
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46
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47 gray **image;
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48 Image_tree p, dwts;
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49
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50 gray maxval;
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8
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51 int rows, cols, format;
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0
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52
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53 double *watermark;
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54
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55 progname = argv[0];
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56
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57 pgm_init(&argc, argv); wm_init();
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58
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59 while ((c = getopt(argc, argv, "a:e:f:F:h?o:l:s:v:")) != EOF) {
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60 switch (c) {
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61 case 'a':
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62 alpha = atof(optarg);
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63 if (alpha <= 0.0) {
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64 fprintf(stderr, "%s: alpha factor %f out of range\n", progname, alpha);
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65 exit(1);
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66 }
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67 break;
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68 case 'l':
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69 level = atoi(optarg);
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70 if (level <= 0) {
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71 fprintf(stderr, "%s: decomposition level %d out of range\n", progname, level);
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72 exit(1);
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73 }
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74 break;
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75 case 'e':
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76 method = atoi(optarg);
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77 if (method < 0) {
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78 fprintf(stderr, "%s: wavelet filtering method %d out of range\n", progname, method);
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79 exit(1);
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80 }
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81 break;
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82 case 'f':
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83 filter = atoi(optarg);
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84 if (filter <= 0) {
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85 fprintf(stderr, "%s: filter number %d out of range\n", progname, filter);
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86 exit(1);
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87 }
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88 break;
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89 case 'F':
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90 strcpy(filter_name, optarg);
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91 break;
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92 case 'h':
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93 case '?':
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94 usage();
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95 break;
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96 case 'o':
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97 if ((out = fopen(optarg, "wb")) == NULL) {
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98 fprintf(stderr, "%s: unable to open output file %s\n", progname, optarg);
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99 exit(1);
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100 }
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101 strcpy(output_name, optarg);
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102 break;
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103 case 's':
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104 if ((sig = fopen(optarg, "r")) == NULL) {
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105 fprintf(stderr, "%s: unable to open signature file %s\n", progname, optarg);
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106 exit(1);
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107 }
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108 strcpy(signature_name, optarg);
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109 break;
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110 case 'v':
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111 verbose = atoi(optarg);
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112 if (verbose < 0) {
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113 fprintf(stderr, "%s: verbosity level %d out of range\n", progname, verbose);
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114 exit(1);
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115 }
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116 break;
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117 }
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118 }
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119
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120 argc -= optind;
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121 argv += optind;
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122
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123 if (argc > 1) {
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124 usage();
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125 exit(1);
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126 }
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127
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8
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128 if (argc == 1 && *argv[0] != '-') {
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0
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129 if ((in = fopen(argv[0], "rb")) == NULL) {
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130 fprintf(stderr, "%s: unable to open input file %s\n", progname, argv[0]);
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131 exit(1);
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132 }
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133 else
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134 strcpy(input_name, argv[0]);
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8
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135 }
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136
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0
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137 if (sig) {
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138 char line[32];
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139 fgets(line, sizeof(line), sig);
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140 if (strspn(line, "ZHSG") >= 4) {
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141 fscanf(sig, "%d\n", &n);
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142 if (alpha == 0.0)
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143 fscanf(sig, "%lf\n", &alpha);
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144 else
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145 fscanf(sig, "%*lf\n");
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146 if (level == 0)
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147 fscanf(sig, "%d\n", &level);
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148 else
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149 fscanf(sig, "%*d\n");
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150 if (method < 0)
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151 fscanf(sig, "%d\n", &method);
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152 else
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153 fscanf(sig, "%*d\n");
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154 if (filter == 0)
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155 fscanf(sig, "%d\n", &filter);
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156 else
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157 fscanf(sig, "%*d\n");
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158 if (!strcmp(filter_name, ""))
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15
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159 fscanf(sig, "%[^\n\r]\n", filter_name);
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0
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160 else
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161 fscanf(sig, "%*[^\n\r]\n");
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162 }
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163 else {
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164 fprintf(stderr, "%s: invalid signature file %s\n", progname, signature_name);
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165 exit(1);
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166 }
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167 }
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168 else {
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169 fprintf(stderr, "%s: signature file not specified, use -s file option\n", progname);
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170 exit(1);
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171 }
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172
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173 watermark = malloc(n * sizeof(double));
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174 for (i = 0; i < n; i++)
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175 fscanf(sig, "%lf\n", &watermark[i]);
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176 fclose(sig);
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177
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178 pgm_readpgminit(in, &cols, &rows, &maxval, &format);
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179 image = pgm_allocarray(cols, rows);
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180 for (row = 0; row < rows; row++)
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181 pgm_readpgmrow(in, image[row], cols, maxval, format);
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182 fclose(in);
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183
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184 // complete decomposition
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185 levels = find_deepest_level(cols, rows) - 1;
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186 if (level > levels) {
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187 fprintf(stderr, "%s: decomposition level %d not possible (max. %d), image size is %d x %d\n", progname, level, levels, cols, rows);
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188 exit(1);
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189 }
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190
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191 // wavelet transform
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192 init_dwt(cols, rows, filter_name, filter, level, method);
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193 #ifdef POLLEN_STUFF
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3
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194 #include "pollen_stuff.c"
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0
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195 #endif
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196 #ifdef PARAM_STUFF
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3
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197 #include "param_stuff.c"
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0
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198 #endif
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199
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200 dwts = fdwt(image);
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201
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202 p = dwts;
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203 while (p->coarse) {
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204 double *collected_coeffs, *largest;
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205 int subband_size = p->horizontal->image->size;
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206 int maxselect = MIN(3 * subband_size, n + 1);
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207 double threshold;
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208
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209 // allocate memory for coefficient vector
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210 collected_coeffs = malloc(3 * subband_size * sizeof(double));
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211 if (!collected_coeffs) {
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212 fprintf(stderr, "%s: malloc() failed\n", progname);
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213 exit(1);
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214 }
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215
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216 // collect coefficients from all subbands of one level into one vector
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217 for (i = 0; i < subband_size; i++) {
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218 collected_coeffs[3 * i + 0] = p->horizontal->image->data[i];
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219 collected_coeffs[3 * i + 1] = p->vertical->image->data[i];
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220 collected_coeffs[3 * i + 2] = p->diagonal->image->data[i];
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221 }
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222
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223 // allocate memory for largest coefficients
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224 largest = malloc(maxselect * sizeof(double));
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225 if (!largest) {
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226 fprintf(stderr, "%s: malloc() failed\n", progname);
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227 exit(1);
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228 }
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229
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230 // select largest coefficients (involves sorting)
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231 select_largest_coeffs(collected_coeffs, 3 * subband_size, maxselect, largest);
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232 // threshold is the smallest of the largest coefficients
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233 threshold = largest[0];
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234 free(largest);
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235 free(collected_coeffs);
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236
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237 w = 0;
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238 for (i = 0; i < subband_size && w < n; i++) {
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239 if (p->horizontal->image->data[i] > threshold)
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240 p->horizontal->image->data[i] *= (1.0 + alpha * watermark[w++]);
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241 if (p->vertical->image->data[i] > threshold)
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242 p->vertical->image->data[i] *= (1.0 + alpha * watermark[w++]);
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243 if (p->diagonal->image->data[i] > threshold)
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244 p->diagonal->image->data[i] *= (1.0 + alpha * watermark[w++]);
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245 }
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246
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247 p = p->coarse;
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248 }
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249
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250 free(watermark);
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251 idwt(dwts, image);
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252
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253 pgm_writepgminit(out, cols, rows, maxval, 0);
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254 for (row = 0; row < rows; row++)
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255 pgm_writepgmrow(out, image[row], cols, maxval, 0);
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256 fclose(out);
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257
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258 pgm_freearray(image, rows);
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259
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260 exit(0);
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261 }
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