--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Meerwald/wm_dugad_e.c	Sun Aug 12 13:14:34 2007 +0200
@@ -0,0 +1,240 @@
+#include "wm.h"
+#include "dwt.h"
+#include "pgm.h"
+
+char *progname;
+
+void usage(void) {
+  fprintf(stderr, "usage: %s [-a n] [-e n] [-f n] [-F file] [-h] [-l n] [-o file] [-t n] [-v n] -s file file\n\n", progname);
+  fprintf(stderr, "\t-a n\t\talpha factor/embedding strength\n");
+  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\tdecomposition levels\n");
+  fprintf(stderr, "\t-o file\t\toutput (watermarked) file\n");
+  fprintf(stderr, "\t-s file\t\tsignature to embed in input image\n");
+  fprintf(stderr, "\t-t n\t\tcasting threshold\n");
+  fprintf(stderr, "\t-v n\t\tverbosity level\n");
+  exit(0);
+}
+
+// actual watermarking procedure: embeds a watermark of n normally
+// distributed values into a coefficients > threshold t1 of a subband
+void wm_subband(Image s, double *w, int n, double a, double t1) {
+  int i;
+
+  for (i = 0; i < s->width * s->height; i++) 
+    if (fabs(s->data[i]) > t1)
+      s->data[i] += (a * fabs(s->data[i]) * w[i % n]);
+}
+
+int main(int argc, char *argv[]) {
+
+  FILE *in = stdin;
+  FILE *out = stdout;
+  FILE *sig = NULL;
+
+  char output_name[MAXPATHLEN] = "(stdout)";
+  char input_name[MAXPATHLEN] = "(stdin)";
+  char signature_name[MAXPATHLEN];
+
+  int i, c;
+  int row, col;
+
+  int n;
+
+  double alpha = 0.0;
+  double t1 = 0.0;
+
+  int levels = 0;
+  int filter = 0;
+  int method = -1;
+  char filter_name[MAXPATHLEN] = "";
+
+  int verbose = 0;
+
+  gray **image;
+  Image_tree dwts, s;
+
+  gray maxval;
+  int rows, cols, colors, format;
+
+  double *watermark;
+
+  progname = argv[0];
+
+  pgm_init(&argc, argv); wm_init();
+
+  while ((c = getopt(argc, argv, "a:e:f:F:h?l:o:s:t:v:")) != EOF) {
+    switch (c) {
+      case 'a':
+        alpha = atof(optarg);
+        if (alpha <= 0.0) {
+          fprintf(stderr, "%s: alpha factor %f out of range\n", progname, alpha);
+          exit(1);
+        }
+        break;
+      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': 
+        levels = atoi(optarg);
+        if (levels <= 0) {
+          fprintf(stderr, "%s: decomposition level %d out of range\n", levels);
+          exit(1);
+        }
+        break;
+      case 'o':
+        if ((out = fopen(optarg, "wb")) == NULL) {
+          fprintf(stderr, "%s: unable to open output file %s\n", progname, optarg);
+          exit(1);
+        }
+        strcpy(output_name, optarg);
+        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 't':
+        t1 = atof(optarg);
+        if (t1 <= 0.0) {
+          fprintf(stderr, "%s: casting threshold %f out of range\n", progname, t1);
+          exit(1);
+        }
+        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, "DGSG") >= 4) {
+      fscanf(sig, "%d\n", &n);
+      if (levels == 0)
+        fscanf(sig, "%d\n", &levels);
+      else
+        fscanf(sig, "%*d\n");
+      if (alpha == 0.0)
+        fscanf(sig, "%lf\n", &alpha);
+      else
+        fscanf(sig, "%*lf\n");
+      if (t1 == 0.0)
+        fscanf(sig, "%lf\n", &t1);
+      else
+        fscanf(sig, "%*lf\n");
+      fscanf(sig, "%*lf\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");
+    }
+    else {
+      fprintf(stderr, "%s: invalid signature file %s\n", progname, signature_name);
+      exit(1);
+    }
+  }
+  else {
+    fprintf(stderr, "%s: signature file not specified, use -s file option\n", progname);
+    exit(1);
+  }
+
+  watermark = malloc(n * sizeof(double));
+  for (i = 0; i < n; i++) 
+    fscanf(sig, "%lf\n", &watermark[i]);
+  fclose(sig);
+
+  pgm_readpgminit(in, &cols, &rows, &maxval, &format);
+
+  image = pgm_allocarray(cols, rows);
+
+  for (row = 0; row < rows; row++)
+    pgm_readpgmrow(in, image[row], cols, maxval, format);
+
+  fclose(in);
+
+  // wavelet transform
+  init_dwt(cols, rows, filter_name, filter, 3, method);
+#ifdef POLLEN_STUFF
+#include "pollen_stuff.xxx"
+#endif
+#ifdef PARAM_STUFF
+#include "param_stuff.xxx"
+#endif
+
+  dwts = fdwt(image);
+
+  // embed watermark in all subbands of a decomposition level
+  for (i = 0, s = dwts; i < 3; i++, s = s->coarse) {
+    wm_subband(s->horizontal->image, watermark, n, alpha, t1);
+    wm_subband(s->vertical->image, watermark, n, alpha, t1);
+    wm_subband(s->diagonal->image, watermark, n, alpha, t1);
+  }
+
+  free(watermark);
+
+  idwt(dwts, image);
+
+  pgm_writepgminit(out, cols, rows, maxval, 0);
+
+  for (row = 0; row < rows; row++)
+    pgm_writepgmrow(out, image[row], cols, maxval, 0);
+
+  fclose(out);
+
+  pgm_freearray(image, rows);
+
+  exit(0);
+}