--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Meerwald-dir/wm_kim_d.c	Fri Dec 20 13:08:59 2024 +0100
@@ -0,0 +1,326 @@
+#include "wm.h"
+#include "dwt.h"
+#include "netpbm/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 file] [-h] [-l n] [-o file] [-v n] -s file -i file file\n\n", progname);
+  fprintf(stderr, "\t-a n\t\talpha factor for detail subband\n");
+  fprintf(stderr, "\t-A n\t\talpha factor for approximation image\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-i file\t\toriginal image file\n");
+  fprintf(stderr, "\t-l n\t\tdecomposition level\n");
+  fprintf(stderr, "\t-o file\t\tfile for extracted watermark\n");
+  fprintf(stderr, "\t-s file\t\toriginal signature file\n");
+  fprintf(stderr, "\t-v n\t\tverbosity level\n");
+  exit(0);
+}
+
+int extract_subband(Image_tree s, Image_tree t, int name, double alpha, double watermark[], double threshold, int w, int n, int verbose) {
+  int i, j;
+
+  for (i = 5; i < s->image->height-5; i++)
+    for (j = 5; j < s->image->width-5; j++) {
+      double orig_coeff, input_coeff;
+
+      orig_coeff = get_pixel(s->image, i, j);
+      input_coeff = get_pixel(t->image, i, j);
+      if (fabs(orig_coeff) > threshold) {
+        watermark[w++] = (input_coeff - orig_coeff) / (alpha * orig_coeff);
+      }
+    }
+
+  if (verbose > 5)
+    fprintf(stderr, "%s: extracted %s%d, size %d x %d; %d coeffs. total\n",
+      progname, subband_name(name), s->level, s->image->width, s->image->height, w);
+
+  return w;
+}
+
+void write_mark(FILE *out, double watermark[], int n) {
+  int i;
+
+  fprintf(out, "%d\n", n);
+  for (i = 0; i < n; i++) 
+    fprintf(out, "%f\n", watermark[i]);
+}
+
+int main(int argc, char *argv[]) {
+
+  FILE *in = stdin;
+  FILE *out = stdout;
+  FILE *orig = NULL;
+  FILE *sig = NULL;
+
+  gray **input_image;
+  gray **orig_image;
+
+  char signature_name[MAXPATHLEN];
+  char output_name[MAXPATHLEN] = "(stdout)";
+  char input_name[MAXPATHLEN] = "(stdin)";
+  char orig_name[MAXPATHLEN];
+
+  int c, w;
+  int n = 0;
+  int method = -1;
+  int filter = 0;
+  char filter_name[MAXPATHLEN] = "";
+
+  int level = 0, levels;
+  double alpha_detail = 0.0;
+  double alpha_approx = 0.0;
+
+  int in_rows, in_cols, in_format;
+  gray in_maxval;
+  int orig_rows, orig_cols, orig_format;
+  gray orig_maxval;
+  int rows, cols;
+  int row;
+
+  double *watermark;
+
+  Image_tree input_dwts, orig_dwts, p, q;
+
+  int verbose = 0;
+
+  progname = argv[0];
+
+  pgm_init(&argc, argv); wm_init2();
+
+  while ((c = getopt(argc, argv, "a:A:e:f:F:h?i:l:o: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 '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 'i':
+        if ((orig = fopen(optarg, "rb")) == NULL) {
+          fprintf(stderr, "%s: unable to open original image file %s\n", progname, optarg);
+          exit(1);
+        }
+        strcpy(orig_name, optarg);
+        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 '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 '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 (!orig) {
+    fprintf(stderr, "%s: original image file not specified, use -i file option\n", progname);
+    exit(1);
+  }
+
+  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);
+    }
+    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);
+  pgm_readpgminit(orig, &orig_cols, &orig_rows, &orig_maxval, &orig_format);
+
+  if (in_cols != orig_cols || in_rows != orig_rows) {
+    fprintf(stderr, "%s: input image %s does not match dimensions of original image %s\n", progname, input_name, orig_name);
+    exit(1);
+  }
+
+  cols = in_cols;
+  rows = in_rows;
+
+  input_image = pgm_allocarray(in_cols, in_rows);
+  orig_image = pgm_allocarray(orig_cols, orig_rows);
+
+  for (row = 0; row < in_rows; row++) {
+    pgm_readpgmrow(in, input_image[row], in_cols, in_maxval, in_format);
+    pgm_readpgmrow(orig, orig_image[row], orig_cols, orig_maxval, orig_format);
+  }
+
+  fclose(in);
+  fclose(orig);
+
+  // 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);
+  }
+
+  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
+
+  input_dwts = fdwt(input_image);
+  orig_dwts = fdwt(orig_image);
+
+  watermark = malloc((rows * cols) * sizeof(double));
+  if (!watermark) {
+    fprintf(stderr, "%s: malloc() failed\n\n", progname);
+    exit(1);
+  }
+
+  p = input_dwts;
+  q = orig_dwts;
+  w = 0;
+  while (p->coarse && q->coarse) { 
+    int current_level;
+    double threshold;
+    double max_coeff;
+    double alpha;
+
+    // get current decomposition level number
+    current_level = q->horizontal->level;
+
+    // find largest absolute coefficient in detail subbands of current decomposition level
+    max_coeff = find_level_largest_coeff(q, 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);
+
+    w = extract_subband(q->horizontal, p->horizontal, HORIZONTAL, alpha, watermark, threshold, w, n, verbose);
+    w = extract_subband(q->vertical, p->vertical, VERTICAL, alpha, watermark, threshold, w, n, verbose);
+    w = extract_subband(q->diagonal, p->diagonal, DIAGONAL, alpha, watermark, threshold, w, n, verbose);
+
+    p = p->coarse;
+    q = q->coarse;
+  }
+
+  // extract watermark from approximation image using calculated significance threshold and embedding strength
+  w = extract_subband(q, p, COARSE, alpha_approx, watermark, calc_level_threshold(find_subband_largest_coeff(q, COARSE, verbose), verbose), w, n, verbose);
+
+  fprintf(out, "KIWM\n");
+  write_mark(out, watermark, w);
+
+  fclose(out);
+
+  free(watermark);
+
+  pgm_freearray(input_image, rows);
+  pgm_freearray(orig_image, rows);
+
+  exit(0);
+}