--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Meerwald-dir/wm_kim_a.c	Fri Dec 20 13:08:59 2024 +0100
@@ -0,0 +1,292 @@
+#include "wm.h"
+#include "wm_dwt.h"
+#include "pgm.h"
+#include "dwt_util.h"
+#include "kim_common.h"
+
+char *progname;
+
+void usage(void) {
+  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);
+  fprintf(stderr, "\t-a n\t\talpha factor/embedding strength for detail subbands\n");
+  fprintf(stderr, "\t-a n\t\talpha factor/embedding strength for approximation subband\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 level\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-v n\t\tverbosity level\n");
+  exit(0);
+}
+
+int mark_subband(Image_tree s, int name, double alpha, double watermark[], double threshold, int w, int n, int verbose) {
+  int i, j;
+  double last = 0.0;
+
+  for (i = 5; i < s->image->height-5; i++)
+    for (j = 5; j < s->image->width-5; j++) {
+      double coeff, newcoeff;
+
+      coeff = get_pixel(s->image, i, j);   
+      if (fabs(coeff) > threshold / 1.5 ) {
+        newcoeff = coeff - coeff * alpha * watermark[w++ % n];
+        set_pixel(s->image, i, j, newcoeff);
+
+        fprintf(stderr, "%s: (%d/%d) %f: %f -> %f; a=%f\n", progname, j, i, watermark[w % n], coeff, newcoeff, alpha);
+        w++;
+      }
+    }
+
+  if (verbose > 5)
+    fprintf(stderr, "%s: watermarking %s%d, size %d x %d; embedded %d coeffs. total\n",
+      progname, subband_name(name), s->level, s->image->width, s->image->height, w);
+
+  return w;
+}
+
+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, w;
+  int row, col;
+
+  int n;
+
+  double alpha_detail = 0.0;
+  double alpha_approx = 0.0;
+  int level = 0;
+
+  int filter = 0;
+  int method = -1;
+  int levels;
+  char filter_name[MAXPATHLEN] = "";
+
+  int verbose = 0;
+
+  gray **image;
+  Image_tree p, dwts;
+
+  gray maxval;
+  int rows, cols, colors, format;
+
+  double *watermark;
+
+  progname = argv[0];
+
+  pgm_init(&argc, argv);
+
+#ifdef __EMX__
+  _fsetmode(in, "b");
+  _fsetmode(out, "b");
+#endif
+
+  while ((c = getopt(argc, argv, "a:A:e:f:F:h?o:l:s:v:")) != EOF) {
+    switch (c) {
+      case 'a':
+        alpha_detail = atof(optarg);
+        if (alpha_detail <= 0.0) {
+          fprintf(stderr, "%s: alpha factor %f out of range\n", progname, alpha_detail);
+          exit(1);
+        }
+        break;
+      case 'A':
+        alpha_approx = atof(optarg);
+        if (alpha_approx <= 0.0) {
+          fprintf(stderr, "%s: alpha factor %f out of range\n", progname, alpha_approx);
+          exit(1);
+        }
+        break;
+      case 'l':
+        level = atoi(optarg);
+        if (level <= 0) {
+          fprintf(stderr, "%s: decomposition level %d out of range\n", progname, level);
+          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 '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 '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, "KISG") >= 4) {
+      fscanf(sig, "%d\n", &n);
+      if (alpha_detail == 0.0)
+        fscanf(sig, "%lf\n", &alpha_detail);
+      else
+        fscanf(sig, "%*f\n");
+      if (alpha_approx == 0.0)
+        fscanf(sig, "%lf\n", &alpha_approx);
+      else
+        fscanf(sig, "%*f\n");
+      if (level == 0)
+        fscanf(sig, "%d\n", &level);
+      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");
+    }
+    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);
+
+  // complete decomposition
+  levels = find_deepest_level(cols, rows) - 1;
+  if (level > levels) {
+    fprintf(stderr, "%s: decomposition level %d not possible (max. %d), image size is %d x %d\n", progname, level, levels, cols, rows);
+    exit(1);
+  }
+
+  // wavelet transform
+  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(image);
+
+  p = dwts;
+  w = 0;
+
+  // process each decomposition level
+  while (p->coarse) {
+    int current_level;
+    double threshold;
+    double max_coeff;
+    double alpha;
+
+    // get current decomposition level number
+    current_level = p->horizontal->level;
+
+    // find largest absolute coefficient in detail subbands of current decomposition level
+    max_coeff = find_level_largest_coeff(p, verbose);
+
+    // calculate significance threshold for current decomposition level
+    threshold = calc_level_threshold(max_coeff, verbose);
+
+    // calculate embedding strength alpha for current decomposition level
+    alpha = calc_level_alpha_detail(alpha_detail, level, current_level, verbose);
+
+    if (verbose > 1)
+      fprintf(stderr, "%s: level %d, threshold %f, alpha %f\n", progname, current_level, threshold, alpha);
+
+    // embed watermark sequence into detail subbands of current decomposition level
+    w = mark_subband(p->horizontal, HORIZONTAL, alpha, watermark, threshold, w, n, verbose);
+    w = mark_subband(p->vertical, VERTICAL, alpha, watermark, threshold, w, n, verbose);
+    w = mark_subband(p->diagonal, DIAGONAL, alpha, watermark, threshold, w, n, verbose);
+
+    p = p->coarse;
+  }
+
+  // mark approximation image using calculated significance threshold and embedding strength
+  w = mark_subband(p, COARSE, alpha_approx, watermark, calc_level_threshold(find_subband_largest_coeff(p, COARSE, verbose), verbose), w, n, verbose);
+
+  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);
+}