--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Meerwald-dir/wm_kund3_d.c	Fri Dec 20 13:08:59 2024 +0100
@@ -0,0 +1,293 @@
+#include "wm.h"
+#include "signature.h"
+#include "dwt.h"
+#include "netpbm/pgm.h"
+
+char *progname;
+
+void usage(void) {
+  fprintf(stderr, "usage: %s [-e n] [-f n] [-F n] [-h] [-l n] [-o file] [-q n] [-s file] [-v n] file\n\n", progname);
+  fprintf(stderr, "\t-e n\t\twavelet filtering method\n");
+  fprintf(stderr, "\t-f n\t\tfilter number\n");
+  fprintf(stderr, "\t-F file\t\tfilter definition file\n");
+  fprintf(stderr, "\t-h\t\tprint usage\n");
+  fprintf(stderr, "\t-l n\t\tembedding level\n");
+  fprintf(stderr, "\t-o file\t\textracted signature file\n");
+  fprintf(stderr, "\t-q n\t\tsignature strength\n");
+  fprintf(stderr, "\t-s file\t\toriginal signature file\n");
+  fprintf(stderr, "\t-v n\t\tverbosity level\n");
+  exit(0);
+}
+
+int main(int argc, char *argv[]) {
+
+  FILE *in = stdin;
+  FILE *out = stdout;
+  FILE *sig = NULL;
+
+  gray **input_image;
+
+  char signature_name[MAXPATHLEN];
+  char output_name[MAXPATHLEN] = "(stdout)";
+  char input_name[MAXPATHLEN] = "(stdin)";
+
+  int r, c;
+  int quality = 0;
+  int seed = 0;
+  int n = 0;
+  int method = -1;
+  int filter = 0;
+  char filter_name[MAXPATHLEN] = "";
+
+  char *binstr;
+
+  int level = 0;
+
+  int in_rows, in_cols, in_format;
+  gray in_maxval;
+  int rows, cols;
+  int row, col;
+
+  Image_tree dwts, p;
+
+  int verbose = 0;
+
+  progname = argv[0];
+
+  pgm_init(&argc, argv);
+  wm_init();
+
+  while ((c = getopt(argc, argv, "e:f:F:h?l:o:q:s:v:")) != EOF) {
+    switch (c) {
+      case 'e':
+        method = atoi(optarg);
+        if (method < 0) {
+          fprintf(stderr, "%s: wavelet filtering method %d out of range\n", progname, method);
+          exit(1);
+        }
+        break;
+      case 'f':
+        filter = atoi(optarg);
+        if (filter <= 0) {
+          fprintf(stderr, "%s: filter number %d out of range\n", progname, filter);
+          exit(1);
+        }
+        break;
+      case 'F':
+        strcpy(filter_name, optarg);
+        break;
+      case 'h':
+      case '?':
+        usage();
+        break;
+      case 'l':
+        level = atoi(optarg);
+        if (level < 1) {
+          fprintf(stderr, "%s: embedding level out of range\n", progname);
+          exit(1);
+        }
+        break;
+      case 'o':
+        if ((out = fopen(optarg, "w")) == NULL) {
+          fprintf(stderr, "%s: unable to open output file %s\n", progname, optarg);
+          exit(1);
+        }
+        strcpy(output_name, optarg);
+        break;
+      case 'q':
+        quality = atoi(optarg);
+        if (quality < 1) {
+          fprintf(stderr, "%s: quality level %d out of range\n", progname, quality);
+          exit(1);
+        }
+        break;
+      case 's':
+        if ((sig = fopen(optarg, "r")) == NULL) {
+          fprintf(stderr, "%s: unable to open signature file %s\n", progname, optarg);
+          exit(1);
+        }
+        strcpy(signature_name, optarg);
+        break;
+      case 'v':
+        verbose = atoi(optarg);
+        if (verbose < 0) {
+          fprintf(stderr, "%s: verbosity level %d out of range\n", progname, verbose);
+          exit(1);
+        }
+        break;
+    }
+  }
+
+  argc -= optind;
+  argv += optind;
+
+  if (argc > 1) {
+    usage();
+    exit(1);
+  }
+
+  if (argc == 1 && *argv[0] != '-') {
+    if ((in = fopen(argv[0], "rb")) == NULL) {
+      fprintf(stderr, "%s: unable to open input file %s\n", progname, argv[0]);
+      exit(1);
+    }
+    else
+      strcpy(input_name, argv[0]);
+  }
+  
+  if (sig) {
+    char line[32];
+    fgets(line, sizeof(line), sig);
+    if (strspn(line, "KD3SG") >= 5) {
+      fscanf(sig, "%d\n", &nbit_signature);
+      if (quality == 0)
+        fscanf(sig, "%d\n", &quality);
+      else
+        fscanf(sig, "%*d\n");
+      if (method < 0)
+        fscanf(sig, "%d\n", &method);
+      else
+        fscanf(sig, "%*d\n");
+      if (filter == 0)
+        fscanf(sig, "%d\n", &filter);
+      else
+        fscanf(sig, "%*d\n");
+      if (!strcmp(filter_name, ""))
+        fscanf(sig, "%[^\n\r]\n", filter_name);
+      else
+        fscanf(sig, "%*[^\n\r]\n");
+      if (level == 0)
+        fscanf(sig, "%d\n", &level);
+      else
+        fscanf(sig, "%*d\n");
+      fscanf(sig, "%d\n", &seed);
+      srandom(seed);
+      nbit_signature2 = nbit_signature;
+      n_signature = n_signature2 = NBITSTOBYTES(nbit_signature2);
+      binstr = malloc((nbit_signature2 + 1) * sizeof(char));
+      fscanf(sig, "%[01]\n", binstr);
+      binstr_to_sig2(binstr);
+      free(binstr);
+      init_signature_bits();
+    }
+    else {
+      fprintf(stderr, "%s: invalid signature file %s\n", progname, signature_name);
+      exit(1);
+    }
+    fclose(sig);
+  }
+  else {
+    fprintf(stderr, "%s: signature file not specified, use -s file option\n", progname);
+    exit(1);
+  }
+
+  pgm_readpgminit(in, &in_cols, &in_rows, &in_maxval, &in_format);
+
+  cols = in_cols;
+  rows = in_rows;
+
+  if (verbose > 0)
+    fprintf(stderr, "%s: extracting %d bits with quality %d from\n"
+                    "  %d x %d host image, decomposition level %d\n",
+                    progname, nbit_signature, quality, cols, rows, level);
+
+  input_image = pgm_allocarray(in_cols, in_rows);
+
+  for (row = 0; row < in_rows; row++)
+    pgm_readpgmrow(in, input_image[row], in_cols, in_maxval, in_format);
+
+  fclose(in);
+
+  init_dwt(cols, rows, filter_name, filter, level, method);
+/*#ifdef POLLEN_STUFF
+#include "pollen_stuff.c"
+#endif
+#ifdef PARAM_STUFF
+#include "param_stuff.c"
+#endif*/
+
+  dwts = fdwt(input_image);
+
+ p = dwts;
+
+#define STEP 3
+
+  // consider each resolution level
+  while (p->coarse->level < level)
+   // descend one level
+    p = p->coarse;
+
+    // start to extracting watermark from beginning at each level
+  {
+    // get width and height of detail images at current level
+    int lwidth = p->vertical->image->width;
+    int lheight =  p->vertical->image->height;
+  
+    if (verbose > 1)
+      fprintf(stderr, "%s: extracting at level %d now, size %d x %d\n",
+        progname, p->coarse->level, lwidth, lheight);
+
+    // consider each coefficient at resolution level
+    for (row = 0; row < lwidth - STEP; row += STEP)
+      for (col = 0; col < lheight - STEP; col += STEP) {
+          double h, v, d;
+          double *f1 = &h, *f2 = &v, *f3 = &d;
+          double delta;
+
+        // key-dependant coefficient selection
+        r = row + 1 + random() % (STEP-2);
+        c = col + 1 + random() % (STEP-2);
+
+         // get coefficient values, one from each detail image
+          h = get_pixel(p->horizontal->image, c, r);
+          v = get_pixel(p->vertical->image, c, r);
+          d = get_pixel(p->diagonal->image, c, r);
+
+          // order pointer to coefficient values such that f1 <= f2 <= f3
+#define SWAP(A, B) {double *t = A; A = B; B = t;}
+          if (*f1 > *f2) SWAP(f1, f2);
+          if (*f2 > *f3) SWAP(f2, f3);
+          if (*f1 > *f2) SWAP(f1, f2);
+
+          // calculate delta, the width of the bins
+          delta = (*f3 - *f1) / (double) (2 * quality - 1);
+
+          // set middle coefficient to closest appropriate bin,
+          // according to watermark bit
+          if (quality == 1) 
+            set_signature_bit(n, (*f3 - *f2) < (*f2 - *f1));
+          else {
+            double l = *f1;
+            int i = 0;
+            while ((l + delta) < *f2) {
+              l += delta; 
+              i++;
+            }
+            if (i % 2)
+              set_signature_bit(n, (l + delta - *f2) > (*f2 - l));
+            else
+              set_signature_bit(n, (l + delta - *f2) < (*f2 - l));
+          }
+
+          if (verbose > 2)
+            fprintf(stderr, "%s: extracted bit #%d (= %d =? %d) at (%d/%d),\n"
+                            "  f1=%lf, f2=%lf, f3=%lf\n", progname, n,
+                            get_signature_bit(n), get_signature2_bit(n),
+                            c, r, *f1, *f2, *f3);
+          n++;
+        }
+  }
+
+  fprintf(out, "KD3WM\n");
+  fprintf(out, "%d\n", n);
+  nbit_signature = n;
+  binstr = malloc(sizeof(char) * (nbit_signature + 1));
+  sig_to_binstr(binstr);
+  fprintf(out, "%s\n", binstr);
+  free(binstr);
+  fclose(out);
+
+  pgm_freearray(input_image, rows);
+
+  exit(0);
+}