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0
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1 #include "wm.h"
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2 #include "dct.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] [-h] [-o file] -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-h\t\tprint usage\n");
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12 fprintf(stderr, "\t-o file\t\toutput (watermarked) file\n");
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13 fprintf(stderr, "\t-s file\t\tsignature to embed in input image\n");
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14 exit(0);
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15 }
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16
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17 int main(int argc, char *argv[]) {
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18
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19 FILE *in = stdin;
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20 FILE *out = stdout;
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21 FILE *sig = NULL;
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22
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23 char output_name[MAXPATHLEN] = "(stdout)";
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24 char input_name[MAXPATHLEN] = "(stdin)";
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25 char signature_name[MAXPATHLEN];
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26
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27 int c;
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8
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28 int row;
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0
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29 int i,j;
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30
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31 int n;
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32
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33 double alpha = 0.0;
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34 double threshold;
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35
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36 double *largest;
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37 gray **input_image;
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38 gray **output_image;
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39 double **dcts;
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40
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41 gray maxval;
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8
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42 int rows, cols, format;
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0
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43
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44 progname = argv[0];
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45
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46 pgm_init(&argc, argv); wm_init();
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47
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48 while ((c = getopt(argc, argv, "a:h?o:s:")) != EOF) {
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49 switch (c) {
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50 case 'a':
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51 alpha = atof(optarg);
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52 if (alpha <= 0.0) {
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53 fprintf(stderr, "%s: alpha factor %f out of range\n", progname, alpha);
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54 exit(1);
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55 }
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56 break;
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57 case 'h':
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58 case '?':
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59 usage();
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60 break;
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61 case 'o':
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62 if ((out = fopen(optarg, "wb")) == NULL) {
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63 fprintf(stderr, "%s: unable to open output file %s\n", progname, optarg);
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64 exit(1);
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65 }
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66 strcpy(output_name, optarg);
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67 break;
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68 case 's':
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69 if ((sig = fopen(optarg, "r")) == NULL) {
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70 fprintf(stderr, "%s: unable to open signature file %s\n", progname, optarg);
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71 exit(1);
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72 }
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73 strcpy(signature_name, optarg);
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74 break;
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75 }
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76 }
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77
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78 argc -= optind;
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79 argv += optind;
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80
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81 if (argc > 1) {
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82 usage();
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83 exit(1);
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84 }
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85
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8
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86 if (argc == 1 && *argv[0] != '-') {
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0
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87 if ((in = fopen(argv[0], "rb")) == NULL) {
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88 fprintf(stderr, "%s: unable to open input file %s\n", progname, argv[0]);
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89 exit(1);
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90 }
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91 else
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92 strcpy(input_name, argv[0]);
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8
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93 }
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94
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0
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95 if (sig) {
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96 char line[32];
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97 fgets(line, sizeof(line), sig);
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98 if (strspn(line, "CXSG") >= 4) {
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99 fscanf(sig, "%d\n", &n);
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100 if (alpha == 0.0)
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101 fscanf(sig, "%lf\n", &alpha);
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102 else
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103 fscanf(sig, "%*lf\n");
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104 fscanf(sig, "%*lf\n");
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105 fscanf(sig, "%*lf\n");
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106 }
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107 else {
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108 fprintf(stderr, "%s: invalid signature file %s\n", progname, signature_name);
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109 exit(1);
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110 }
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111 }
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112 else {
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113 fprintf(stderr, "%s: signature file not specified, use -s file option\n", progname);
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114 exit(1);
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115 }
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116
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117 pgm_readpgminit(in, &cols, &rows, &maxval, &format);
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118
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119 init_dct_NxN(cols, rows);
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120
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121 dcts = alloc_coeffs(cols, rows);
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122 input_image = pgm_allocarray(cols, rows);
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123
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124 for (row = 0; row < rows; row++)
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125 pgm_readpgmrow(in, input_image[row], cols, maxval, format);
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126
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127 fclose(in);
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128
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129 output_image = pgm_allocarray(cols, rows);
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130
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131 fdct_NxN(input_image, dcts);
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132
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133 largest = malloc((n + 1) * sizeof(double));
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134 select_largest_coeffs(dcts[0], cols * rows, n+1, largest);
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135 threshold = largest[0];
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136 free(largest);
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137
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138 j = 0;
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139 for (i = 0; i < n; i++) {
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140 double v;
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141
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142 while (dcts[j / cols][j % cols] < threshold) j++;
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143
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144 fscanf(sig, "%lf\n", &v);
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145 dcts[j / cols][j % cols] *= (1.0 + alpha * v);
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146 j++;
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147 }
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148
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149 idct_NxN(dcts, output_image);
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150 free_coeffs(dcts);
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151
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152 pgm_writepgminit(out, cols, rows, maxval, 0);
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153
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154 for (row = 0; row < rows; row++)
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155 pgm_writepgmrow(out, output_image[row], cols, maxval, 0);
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156
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157 fclose(out);
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158
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159 fclose(sig);
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160
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161 pgm_freearray(output_image, rows);
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162 pgm_freearray(input_image, rows);
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163
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164 exit(0);
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165 }
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