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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 #include "kim_common.h"
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6
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7 char *progname;
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8
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9 void usage(void) {
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10 fprintf(stderr, "usage: %s [-a n] [-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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11 fprintf(stderr, "\t-a n\t\talpha factor/embedding strength for detail subbands\n");
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12 fprintf(stderr, "\t-a n\t\talpha factor/embedding strength for approximation subband\n");
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13 fprintf(stderr, "\t-e n\t\twavelet filtering method\n");
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14 fprintf(stderr, "\t-f n\t\tfilter number\n");
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15 fprintf(stderr, "\t-F file\t\tfilter definition file\n");
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16 fprintf(stderr, "\t-h\t\tprint usage\n");
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17 fprintf(stderr, "\t-l n\t\tdecomposition level\n");
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18 fprintf(stderr, "\t-o file\t\toutput (watermarked) file\n");
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19 fprintf(stderr, "\t-s file\t\tsignature to embed in input image\n");
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20 fprintf(stderr, "\t-v n\t\tverbosity level\n");
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21 exit(0);
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22 }
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23
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24 int mark_subband(Image_tree s, int name, double alpha, double watermark[], double threshold, int w, int n, int verbose) {
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25 int i, j;
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26
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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) > threshold) {
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33 newcoeff = coeff + alpha * coeff * 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 if (verbose >= 9)
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37 fprintf(stderr, "%s: (%d/%d) %f: %f -> %f\n", progname, j, i, watermark[w % n], coeff, newcoeff);
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38
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39 w++;
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40 }
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41 }
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42
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43 if (verbose > 5)
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44 fprintf(stderr, "%s: watermarking %s%d, size %d x %d; embedded %d coeffs. total\n",
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45 progname, subband_name(name), s->level, s->image->width, s->image->height, w);
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46
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47 return w;
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48 }
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49
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50 int main(int argc, char *argv[]) {
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51
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52 FILE *in = stdin;
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53 FILE *out = stdout;
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54 FILE *sig = NULL;
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55
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56 char output_name[MAXPATHLEN] = "(stdout)";
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57 char input_name[MAXPATHLEN] = "(stdin)";
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58 char signature_name[MAXPATHLEN];
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59
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60 int i, c, w;
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61 int row, col;
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62
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63 int n;
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64
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65 double alpha_detail = 0.0;
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66 double alpha_approx = 0.0;
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67 int level = 0;
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68
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69 int filter = 0;
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70 int method = -1;
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71 int levels;
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72 char filter_name[MAXPATHLEN] = "";
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73
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74 int verbose = 0;
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75
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76 gray **image;
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77 Image_tree p, dwts;
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78
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79 gray maxval;
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80 int rows, cols, colors, format;
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81
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82 double *watermark;
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83
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84 progname = argv[0];
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85
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86 pgm_init(&argc, argv); wm_init();
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87
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88 while ((c = getopt(argc, argv, "a:A:e:f:F:h?o:l:s:v:")) != EOF) {
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89 switch (c) {
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90 case 'a':
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91 alpha_detail = atof(optarg);
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92 if (alpha_detail <= 0.0) {
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93 fprintf(stderr, "%s: alpha factor %f out of range\n", progname, alpha_detail);
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94 exit(1);
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95 }
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96 break;
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97 case 'A':
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98 alpha_approx = atof(optarg);
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99 if (alpha_approx <= 0.0) {
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100 fprintf(stderr, "%s: alpha factor %f out of range\n", progname, alpha_approx);
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101 exit(1);
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102 }
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103 break;
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104 case 'l':
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105 level = atoi(optarg);
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106 if (level <= 0) {
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107 fprintf(stderr, "%s: decomposition level %d out of range\n", progname, level);
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108 exit(1);
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109 }
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110 break;
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111 case 'e':
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112 method = atoi(optarg);
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113 if (method < 0) {
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114 fprintf(stderr, "%s: wavelet filtering method %d out of range\n", progname, method);
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115 exit(1);
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116 }
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117 break;
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118 case 'f':
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119 filter = atoi(optarg);
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120 if (filter <= 0) {
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121 fprintf(stderr, "%s: filter number %d out of range\n", progname, filter);
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122 exit(1);
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123 }
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124 break;
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125 case 'F':
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126 strcpy(filter_name, optarg);
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127 break;
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128 case 'h':
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129 case '?':
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130 usage();
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131 break;
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132 case 'o':
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133 if ((out = fopen(optarg, "wb")) == NULL) {
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134 fprintf(stderr, "%s: unable to open output file %s\n", progname, optarg);
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135 exit(1);
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136 }
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137 strcpy(output_name, optarg);
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138 break;
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139 case 's':
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140 if ((sig = fopen(optarg, "r")) == NULL) {
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141 fprintf(stderr, "%s: unable to open signature file %s\n", progname, optarg);
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142 exit(1);
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143 }
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144 strcpy(signature_name, optarg);
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145 break;
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146 case 'v':
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147 verbose = atoi(optarg);
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148 if (verbose < 0) {
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149 fprintf(stderr, "%s: verbosity level %d out of range\n", progname, verbose);
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150 exit(1);
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151 }
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152 break;
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153 }
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154 }
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155
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156 argc -= optind;
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157 argv += optind;
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158
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159 if (argc > 1) {
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160 usage();
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161 exit(1);
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162 }
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163
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164 if (argc == 1 && *argv[0] != '-')
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165 if ((in = fopen(argv[0], "rb")) == NULL) {
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166 fprintf(stderr, "%s: unable to open input file %s\n", progname, argv[0]);
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167 exit(1);
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168 }
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169 else
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170 strcpy(input_name, argv[0]);
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171
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172 if (sig) {
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173 char line[32];
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174 fgets(line, sizeof(line), sig);
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175 if (strspn(line, "KISG") >= 4) {
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176 fscanf(sig, "%d\n", &n);
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177 if (alpha_detail == 0.0)
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178 fscanf(sig, "%lf\n", &alpha_detail);
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179 else
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180 fscanf(sig, "%*lf\n");
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181 if (alpha_approx == 0.0)
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182 fscanf(sig, "%lf\n", &alpha_approx);
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183 else
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184 fscanf(sig, "%*lf\n");
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185 if (level == 0)
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186 fscanf(sig, "%d\n", &level);
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187 else
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188 fscanf(sig, "%*d\n");
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189 if (method < 0)
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190 fscanf(sig, "%d\n", &method);
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191 else
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192 fscanf(sig, "%*d\n");
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193 if (filter == 0)
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194 fscanf(sig, "%d\n", &filter);
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195 else
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196 fscanf(sig, "%*d\n");
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197 if (!strcmp(filter_name, ""))
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198 fscanf(sig, "%[^\n\r]\n", &filter_name);
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199 else
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200 fscanf(sig, "%*[^\n\r]\n");
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201 }
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202 else {
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203 fprintf(stderr, "%s: invalid signature file %s\n", progname, signature_name);
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204 exit(1);
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205 }
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206 }
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207 else {
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208 fprintf(stderr, "%s: signature file not specified, use -s file option\n", progname);
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209 exit(1);
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210 }
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211
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212 watermark = malloc(n * sizeof(double));
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213 for (i = 0; i < n; i++)
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214 fscanf(sig, "%lf\n", &watermark[i]);
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215 fclose(sig);
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216
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217 pgm_readpgminit(in, &cols, &rows, &maxval, &format);
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218 image = pgm_allocarray(cols, rows);
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219 for (row = 0; row < rows; row++)
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220 pgm_readpgmrow(in, image[row], cols, maxval, format);
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221 fclose(in);
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222
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223 // complete decomposition
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224 levels = find_deepest_level(cols, rows) - 1;
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225 if (level > levels) {
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226 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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227 exit(1);
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228 }
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229
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230 // wavelet transform
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231 init_dwt(cols, rows, filter_name, filter, level, method);
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232 #ifdef POLLEN_STUFF
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3
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233 #include "pollen_stuff.c"
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0
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234 #endif
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235 #ifdef PARAM_STUFF
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3
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236 #include "param_stuff.c"
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0
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237 #endif
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238
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239 dwts = fdwt(image);
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240
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241 p = dwts;
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242 w = 0;
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243
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244 // process each decomposition level
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245 while (p->coarse) {
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246 int current_level;
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247 double threshold;
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248 double max_coeff;
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249 double alpha;
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250
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251 // get current decomposition level number
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252 current_level = p->horizontal->level;
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253
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254 // find largest absolute coefficient in detail subbands of current decomposition level
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255 max_coeff = find_level_largest_coeff(p, verbose);
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256
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257 // calculate significance threshold for current decomposition level
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258 threshold = calc_level_threshold(max_coeff, verbose);
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259
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260 // calculate embedding strength alpha for current decomposition level
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261 alpha = calc_level_alpha_detail(alpha_detail, level, current_level, verbose);
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262
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263 if (verbose > 1)
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264 fprintf(stderr, "%s: level %d, threshold %f, alpha %f\n", progname, current_level, threshold, alpha);
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265
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266 // embed watermark sequence into detail subbands of current decomposition level
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267 w = mark_subband(p->horizontal, HORIZONTAL, alpha, watermark, threshold, w, n, verbose);
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268 w = mark_subband(p->vertical, VERTICAL, alpha, watermark, threshold, w, n, verbose);
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269 w = mark_subband(p->diagonal, DIAGONAL, alpha, watermark, threshold, w, n, verbose);
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270
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271 p = p->coarse;
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272 }
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273
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274 // mark approximation image using calculated significance threshold and embedding strength
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275 w = mark_subband(p, COARSE, alpha_approx, watermark, calc_level_threshold(find_subband_largest_coeff(p, COARSE, verbose), verbose), w, n, verbose);
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276
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277 free(watermark);
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278 idwt(dwts, image);
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279
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280 pgm_writepgminit(out, cols, rows, maxval, 0);
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281 for (row = 0; row < rows; row++)
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282 pgm_writepgmrow(out, image[row], cols, maxval, 0);
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283 fclose(out);
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284
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285 pgm_freearray(image, rows);
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286
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287 exit(0);
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288 }
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