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0
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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 "dwt_util.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 void mark_subband(Image_tree s, int name, double alpha, double watermark[], int n, int verbose) {
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23 int i, j;
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24 int w;
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25
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26 w = 0;
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27 for (i = 5; i < s->image->height-5; i++)
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28 for (j = 5; j < s->image->width-5; j++) {
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29 double coeff, newcoeff;
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30
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31 coeff = get_pixel(s->image, i, j);
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32 if (fabs(coeff) > 20.0) {
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33 newcoeff = coeff + alpha * pow(fabs(coeff), 1.2) * watermark[w++ % n];
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34 set_pixel(s->image, i, j, newcoeff);
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35 }
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36 }
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37
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38 if (verbose > 3)
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39 fprintf(stderr, "%s: watermarking %s%d, size %d x %d; embedded %d coeffs.\n",
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40 progname, subband_name(name), s->level, s->image->width, s->image->height, w);
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41 }
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42
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43 int main(int argc, char *argv[]) {
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44
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45 FILE *in = stdin;
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46 FILE *out = stdout;
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47 FILE *sig = NULL;
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48
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49 char output_name[MAXPATHLEN] = "(stdout)";
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50 char input_name[MAXPATHLEN] = "(stdin)";
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51 char signature_name[MAXPATHLEN];
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52
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8
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53 int i, c;
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54 int row;
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0
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55
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56 int n;
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57
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58 double alpha = 0.0;
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59 int level = 0;
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60
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61 int filter = 0;
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62 int method = -1;
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63 int levels;
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64 char filter_name[MAXPATHLEN] = "";
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65
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66 int verbose = 0;
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67
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68 gray **image;
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69 Image_tree p, dwts;
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70
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71 gray maxval;
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8
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72 int rows, cols, format;
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0
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73
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74 double *watermark;
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75
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76 progname = argv[0];
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77
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78 pgm_init(&argc, argv); wm_init();
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79
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80 while ((c = getopt(argc, argv, "a:e:f:F:h?o:l:s:v:")) != EOF) {
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81 switch (c) {
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82 case 'a':
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83 alpha = atof(optarg);
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84 if (alpha <= 0.0) {
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85 fprintf(stderr, "%s: alpha factor %f out of range\n", progname, alpha);
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86 exit(1);
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87 }
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88 break;
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89 case 'l':
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90 level = atoi(optarg);
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91 if (level <= 0) {
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92 fprintf(stderr, "%s: decomposition level %d out of range\n", progname, level);
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93 exit(1);
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94 }
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95 break;
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96 case 'e':
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97 method = atoi(optarg);
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98 if (method < 0) {
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99 fprintf(stderr, "%s: wavelet filtering method %d out of range\n", progname, method);
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100 exit(1);
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101 }
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102 break;
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103 case 'f':
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104 filter = atoi(optarg);
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105 if (filter <= 0) {
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106 fprintf(stderr, "%s: filter number %d out of range\n", progname, filter);
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107 exit(1);
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108 }
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109 break;
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110 case 'F':
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111 strcpy(filter_name, optarg);
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112 break;
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113 case 'h':
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114 case '?':
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115 usage();
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116 break;
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117 case 'o':
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118 if ((out = fopen(optarg, "wb")) == NULL) {
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119 fprintf(stderr, "%s: unable to open output file %s\n", progname, optarg);
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120 exit(1);
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121 }
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122 strcpy(output_name, optarg);
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123 break;
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124 case 's':
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125 if ((sig = fopen(optarg, "r")) == NULL) {
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126 fprintf(stderr, "%s: unable to open signature file %s\n", progname, optarg);
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127 exit(1);
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128 }
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129 strcpy(signature_name, optarg);
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130 break;
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131 case 'v':
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132 verbose = atoi(optarg);
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133 if (verbose < 0) {
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134 fprintf(stderr, "%s: verbosity level %d out of range\n", progname, verbose);
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135 exit(1);
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136 }
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137 break;
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138 }
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139 }
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140
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141 argc -= optind;
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142 argv += optind;
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143
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144 if (argc > 1) {
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145 usage();
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146 exit(1);
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147 }
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148
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8
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149 if (argc == 1 && *argv[0] != '-') {
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0
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150 if ((in = fopen(argv[0], "rb")) == NULL) {
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151 fprintf(stderr, "%s: unable to open input file %s\n", progname, argv[0]);
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152 exit(1);
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153 }
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154 else
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155 strcpy(input_name, argv[0]);
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8
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156 }
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157
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0
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158 if (sig) {
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159 char line[32];
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160 fgets(line, sizeof(line), sig);
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161 if (strspn(line, "XASG") >= 4) {
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162 fscanf(sig, "%d\n", &n);
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163 if (alpha == 0.0)
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164 fscanf(sig, "%lf\n", &alpha);
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165 else
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166 fscanf(sig, "%*lf\n");
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167 if (level == 0)
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168 fscanf(sig, "%d\n", &level);
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169 else
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170 fscanf(sig, "%*d\n");
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171 if (method < 0)
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172 fscanf(sig, "%d\n", &method);
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173 else
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174 fscanf(sig, "%*d\n");
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175 if (filter == 0)
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176 fscanf(sig, "%d\n", &filter);
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177 else
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178 fscanf(sig, "%*d\n");
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179 if (!strcmp(filter_name, ""))
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15
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180 fscanf(sig, "%[^\n\r]\n", filter_name);
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0
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181 else
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182 fscanf(sig, "%*[^\n\r]\n");
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183 }
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184 else {
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185 fprintf(stderr, "%s: invalid signature file %s\n", progname, signature_name);
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186 exit(1);
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187 }
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188 }
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189 else {
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190 fprintf(stderr, "%s: signature file not specified, use -s file option\n", progname);
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191 exit(1);
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192 }
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193
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194 watermark = malloc(n * sizeof(double));
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195 for (i = 0; i < n; i++)
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196 fscanf(sig, "%lf\n", &watermark[i]);
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197 fclose(sig);
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198
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199 pgm_readpgminit(in, &cols, &rows, &maxval, &format);
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200 image = pgm_allocarray(cols, rows);
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201 for (row = 0; row < rows; row++)
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202 pgm_readpgmrow(in, image[row], cols, maxval, format);
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203 fclose(in);
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204
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205 // complete decomposition
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206 levels = find_deepest_level(cols, rows) - 1;
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207 if (level > levels) {
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208 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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209 exit(1);
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210 }
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211
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212 // wavelet transform
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213 init_dwt(cols, rows, filter_name, filter, level, method);
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214 #ifdef POLLEN_STUFF
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3
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215 #include "pollen_stuff.c"
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0
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216 #endif
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217 #ifdef PARAM_STUFF
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3
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218 #include "param_stuff.c"
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0
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219 #endif
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220
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221 dwts = fdwt(image);
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222
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223 p = dwts;
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224 while (p->coarse) {
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225
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226 mark_subband(p->horizontal, HORIZONTAL, alpha, watermark, n, verbose);
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227 mark_subband(p->vertical, VERTICAL, alpha, watermark, n, verbose);
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228 mark_subband(p->diagonal, DIAGONAL, alpha, watermark, n, verbose);
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229
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230 p = p->coarse;
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231 }
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232
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233 free(watermark);
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234 idwt(dwts, image);
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235
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236 pgm_writepgminit(out, cols, rows, maxval, 0);
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237 for (row = 0; row < rows; row++)
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238 pgm_writepgmrow(out, image[row], cols, maxval, 0);
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239 fclose(out);
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240
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241 pgm_freearray(image, rows);
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242
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243 exit(0);
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244 }
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