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1 #include "wm.h"
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2 #include "wm_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 double last = 0.0;
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27
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28 for (i = 5; i < s->image->height-5; i++)
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29 for (j = 5; j < s->image->width-5; j++) {
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30 double coeff, newcoeff;
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31
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32 coeff = get_pixel(s->image, i, j);
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33 if (fabs(coeff) > threshold / 1.5 ) {
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34 newcoeff = coeff - coeff * alpha * watermark[w++ % n];
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35 set_pixel(s->image, i, j, newcoeff);
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36
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37 fprintf(stderr, "%s: (%d/%d) %f: %f -> %f; a=%f\n", progname, j, i, watermark[w % n], coeff, newcoeff, alpha);
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38 w++;
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39 }
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40 }
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41
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42 if (verbose > 5)
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43 fprintf(stderr, "%s: watermarking %s%d, size %d x %d; embedded %d coeffs. total\n",
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44 progname, subband_name(name), s->level, s->image->width, s->image->height, w);
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45
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46 return w;
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47 }
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48
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49 int main(int argc, char *argv[]) {
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50
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51 FILE *in = stdin;
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52 FILE *out = stdout;
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53 FILE *sig = NULL;
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54
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55 char output_name[MAXPATHLEN] = "(stdout)";
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56 char input_name[MAXPATHLEN] = "(stdin)";
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57 char signature_name[MAXPATHLEN];
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58
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59 int i, c, w;
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60 int row, col;
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61
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62 int n;
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63
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64 double alpha_detail = 0.0;
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65 double alpha_approx = 0.0;
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66 int level;
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67
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68 int filter = 0;
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69 int method = -1;
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70 int levels;
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71 char filter_name[MAXPATHLEN] = "";
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72
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73 int verbose = 0;
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74
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75 gray **image;
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76 Image_tree p, dwts;
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77
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78 gray maxval;
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79 int rows, cols, colors, format;
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80
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81 double *watermark;
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82
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83 progname = argv[0];
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84
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85 pgm_init(&argc, argv);
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86
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87 #ifdef __EMX__
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88 _fsetmode(in, "b");
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89 _fsetmode(out, "b");
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90 #endif
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91
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92 while ((c = getopt(argc, argv, "a:A:e:f:F:h?o:l:s:v:")) != EOF) {
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93 switch (c) {
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94 case 'a':
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95 alpha_detail = atof(optarg);
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96 if (alpha_detail <= 0.0) {
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97 fprintf(stderr, "%s: alpha factor %f out of range\n", progname, alpha_detail);
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98 exit(1);
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99 }
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100 break;
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101 case 'A':
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102 alpha_approx = atof(optarg);
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103 if (alpha_approx <= 0.0) {
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104 fprintf(stderr, "%s: alpha factor %f out of range\n", progname, alpha_approx);
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105 exit(1);
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106 }
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107 break;
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108 case 'l':
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109 level = atoi(optarg);
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110 if (level <= 0) {
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111 fprintf(stderr, "%s: decomposition level %d out of range\n", progname, level);
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112 exit(1);
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113 }
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114 break;
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115 case 'e':
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116 method = atoi(optarg);
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117 if (method < 0) {
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118 fprintf(stderr, "%s: wavelet filtering method %d out of range\n", progname, method);
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119 exit(1);
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120 }
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121 break;
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122 case 'f':
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123 filter = atoi(optarg);
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124 if (filter <= 0) {
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125 fprintf(stderr, "%s: filter number %d out of range\n", progname, filter);
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126 exit(1);
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127 }
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128 break;
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129 case 'F':
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130 strcpy(filter_name, optarg);
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131 break;
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132 case 'h':
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133 case '?':
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134 usage();
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135 break;
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136 case 'o':
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137 if ((out = fopen(optarg, "wb")) == NULL) {
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138 fprintf(stderr, "%s: unable to open output file %s\n", progname, optarg);
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139 exit(1);
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140 }
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141 strcpy(output_name, optarg);
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142 break;
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143 case 's':
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144 if ((sig = fopen(optarg, "r")) == NULL) {
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145 fprintf(stderr, "%s: unable to open signature file %s\n", progname, optarg);
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146 exit(1);
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147 }
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148 strcpy(signature_name, optarg);
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149 break;
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150 case 'v':
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151 verbose = atoi(optarg);
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152 if (verbose < 0) {
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153 fprintf(stderr, "%s: verbosity level %d out of range\n", progname, verbose);
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154 exit(1);
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155 }
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156 break;
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157 }
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158 }
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159
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160 argc -= optind;
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161 argv += optind;
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162
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163 if (argc > 1) {
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164 usage();
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165 exit(1);
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166 }
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167
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168 if (argc == 1 && *argv[0] != '-')
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169 if ((in = fopen(argv[0], "rb")) == NULL) {
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170 fprintf(stderr, "%s: unable to open input file %s\n", progname, argv[0]);
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171 exit(1);
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172 }
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173 else
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174 strcpy(input_name, argv[0]);
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175
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176 if (sig) {
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177 char line[32];
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178 fgets(line, sizeof(line), sig);
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179 if (strspn(line, "KISG") >= 4) {
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180 fscanf(sig, "%d\n", &n);
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181 if (alpha_detail == 0.0)
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182 fscanf(sig, "%lf\n", &alpha_detail);
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183 else
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184 fscanf(sig, "%*lf\n");
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185 if (alpha_approx == 0.0)
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186 fscanf(sig, "%lf\n", &alpha_approx);
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187 else
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188 fscanf(sig, "%*lf\n");
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189 if (level == 0)
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190 fscanf(sig, "%d\n", &level);
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191 else
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192 fscanf(sig, "%*d\n");
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193 if (method < 0)
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194 fscanf(sig, "%d\n", &method);
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195 else
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196 fscanf(sig, "%*d\n");
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197 if (filter == 0)
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198 fscanf(sig, "%d\n", &filter);
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199 else
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200 fscanf(sig, "%*d\n");
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201 if (!strcmp(filter_name, ""))
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202 fscanf(sig, "%[^\n\r]\n", &filter_name);
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203 else
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204 fscanf(sig, "%*[^\n\r]\n");
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205 }
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206 else {
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207 fprintf(stderr, "%s: invalid signature file %s\n", progname, signature_name);
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208 exit(1);
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209 }
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210 }
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211 else {
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212 fprintf(stderr, "%s: signature file not specified, use -s file option\n", progname);
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213 exit(1);
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214 }
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215
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216 watermark = malloc(n * sizeof(double));
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217 for (i = 0; i < n; i++)
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218 fscanf(sig, "%lf\n", &watermark[i]);
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219 fclose(sig);
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220
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221 pgm_readpgminit(in, &cols, &rows, &maxval, &format);
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222 image = pgm_allocarray(cols, rows);
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223 for (row = 0; row < rows; row++)
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224 pgm_readpgmrow(in, image[row], cols, maxval, format);
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225 fclose(in);
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226
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227 // complete decomposition
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228 levels = find_deepest_level(cols, rows) - 1;
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229 if (level > levels) {
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230 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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231 exit(1);
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232 }
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233
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234 // wavelet transform
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235 init_dwt(cols, rows, filter_name, filter, level, method);
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236 #ifdef POLLEN_STUFF
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237 #include "pollen_stuff.xxx"
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238 #endif
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239 #ifdef PARAM_STUFF
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240 #include "param_stuff.xxx"
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241 #endif
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242
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243 dwts = fdwt(image);
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244
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245 p = dwts;
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246 w = 0;
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247
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248 // process each decomposition level
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249 while (p->coarse) {
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250 int current_level;
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251 double threshold;
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252 double max_coeff;
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253 double alpha;
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254
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255 // get current decomposition level number
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256 current_level = p->horizontal->level;
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257
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258 // find largest absolute coefficient in detail subbands of current decomposition level
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259 max_coeff = find_level_largest_coeff(p, verbose);
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260
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261 // calculate significance threshold for current decomposition level
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262 threshold = calc_level_threshold(max_coeff, verbose);
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263
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264 // calculate embedding strength alpha for current decomposition level
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265 alpha = calc_level_alpha_detail(alpha_detail, level, current_level, verbose);
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266
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267 if (verbose > 1)
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268 fprintf(stderr, "%s: level %d, threshold %f, alpha %f\n", progname, current_level, threshold, alpha);
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269
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270 // embed watermark sequence into detail subbands of current decomposition level
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271 w = mark_subband(p->horizontal, HORIZONTAL, alpha, watermark, threshold, w, n, verbose);
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272 w = mark_subband(p->vertical, VERTICAL, alpha, watermark, threshold, w, n, verbose);
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273 w = mark_subband(p->diagonal, DIAGONAL, alpha, watermark, threshold, w, n, verbose);
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274
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275 p = p->coarse;
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276 }
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277
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278 // mark approximation image using calculated significance threshold and embedding strength
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279 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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280
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281 free(watermark);
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282 idwt(dwts, image);
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283
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284 pgm_writepgminit(out, cols, rows, maxval, 0);
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285 for (row = 0; row < rows; row++)
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286 pgm_writepgmrow(out, image[row], cols, maxval, 0);
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287 fclose(out);
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288
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289 pgm_freearray(image, rows);
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290
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291 exit(0);
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292 }
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