--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Meerwald-dir/wm_kund2_e.c	Fri Dec 20 13:08:59 2024 +0100
@@ -0,0 +1,331 @@
+#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] [-v n] -s file file\n\n", progname);
+  fprintf(stderr, "\t-a n\t\toverall 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-l n\t\tembedding level\n");
+  fprintf(stderr, "\t-h\t\tprint usage\n");
+  fprintf(stderr, "\t-o file\t\toutput (watermarked) file\n");
+  fprintf(stderr, "\t-q n\t\tsignature strength (default 4)\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 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];
+
+  char *binstr;
+
+  int r, c, n;
+  int row, col;
+
+  int quality = 0;
+  int blocksize = 0;
+  int filter = 0;
+  int method = -1;
+  int level = 0;
+  char filter_name[MAXPATHLEN] = "";
+
+  double alpha = 0.0;
+  int seed;
+  int verbose = 0;
+
+  gray **image;
+  Image_tree dwts, p;
+
+  gray maxval;
+  int rows, cols, format;
+
+  progname = argv[0];
+
+  pgm_init(&argc, argv);
+  wm_init();
+
+  while ((c = getopt(argc, argv, "a:e:f:F:h?l:o:q:s:v:")) != EOF) {
+    switch (c) {
+      case 'a':
+        alpha = atof(optarg);
+        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':
+        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, "wb")) == 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 factor %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[1024];
+    fgets(line, sizeof(line), sig);
+    if (strspn(line, "KD2SG") >= 5) {
+      fscanf(sig, "%d\n", &nbit_signature);
+      if (quality == 0)
+        fscanf(sig, "%d\n", &quality);
+      else
+        fscanf(sig, "%*d\n");
+      if (blocksize == 0)
+        fscanf(sig, "%d\n", &blocksize);
+      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);
+      n_signature = NBITSTOBYTES(nbit_signature);
+      binstr = malloc((nbit_signature + 1) * sizeof(char));
+      fscanf(sig, "%[01]\n", binstr);
+      binstr_to_sig(binstr);
+      free(binstr);
+    }
+    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, &cols, &rows, &maxval, &format);
+
+  if (verbose > 0) 
+    fprintf(stderr, "%s: embedding %d bits with quality %d in\n"
+                    "  %d x %d host image, up to decomposition level %d\n",
+                    progname, nbit_signature, quality, cols, rows, level);
+
+  image = pgm_allocarray(cols, rows);
+
+  for (row = 0; row < rows; row++)
+    pgm_readpgmrow(in, image[row], cols, maxval, format);
+
+  fclose(in);
+
+  // decomposition of image
+  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;
+
+  // consider each resolution level
+  while (p->coarse->level < level) {
+    int lwidth = p->vertical->image->width;
+    int lheight =  p->vertical->image->height;
+    int l = p->vertical->level;
+    int bx, by;
+    int nblock;
+    int bits_per_level;
+
+    nblock = 0;
+    bits_per_level = 0;
+    for (bx = 0; bx < lwidth; bx += blocksize) {
+      for (by = 0; by < lheight; by += blocksize) {
+        int bw = MIN(bx + blocksize, lwidth);
+        int bh = MIN(by + blocksize, lheight);
+        int STEP;
+        float MIN_DIFF;
+
+    // start to embed signature from beginning at each level
+    // get width and height of detail images at current level 
+
+
+    if (verbose > 1) 
+      fprintf(stderr, "%s: embedding at level %d now, block %d, size %d x %d at %d, %d\n",
+        progname, l, nblock, bw, bh, bx, by);
+
+    MIN_DIFF = ROUND(120.0 * alpha);
+    STEP = ROUND(alpha * (-15.555) +  10.777);
+// fprintf(stderr, "XXX %d %f\n", STEP, MIN_DIFF);
+
+    n = 0;
+    // consider each coefficient at resolution level
+    for (row = by; row < bh - STEP; row += STEP)
+      for (col = bx; col < bw - 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);
+
+          if (verbose > 2) 
+            fprintf(stderr, "%s: embedding bit #%d (= %d) at (%d/%d),\n",
+                            progname, n, get_signature_bit(n % nbit_signature), c, r);
+          if (verbose > 5) 
+            fprintf(stderr, "  h=%lf, v=%lf, d=%lf\n", h, v, d);
+          if (verbose > 2)
+            fprintf(stderr, "  f1=%lf, f2=%lf", *f1, *f2);
+
+          if ((*f3 - *f1) < MIN_DIFF) {
+            double adj = (MIN_DIFF - (*f3 - *f1)) / 2.0;
+            *f1 -= adj;
+            *f3 += adj;            
+          }
+
+          // 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
+          bits_per_level++;
+          if (quality == 1)
+            *f2 = get_signature_bit(n % nbit_signature) ? *f3 : *f1;
+          else {
+            double l = get_signature_bit(n % nbit_signature) ? *f1 + delta : *f1;
+            while ((l + 2 * delta) < *f2) l += 2 * delta;
+            *f2 = (*f2 - l) < (l + 2 * delta - *f2) ? l : l + 2 * delta;
+          }
+
+          if (verbose > 2) 
+            fprintf(stderr, " -> %lf, f3=%lf\n", *f2, *f3);
+
+          // write pixels, one of them modified
+          set_pixel(p->horizontal->image, c, r, h);
+          set_pixel(p->vertical->image, c, r, v);
+          set_pixel(p->diagonal->image, c, r, d);
+
+          n++;
+
+        }
+      }
+    }
+
+    if (verbose > 1) 
+      fprintf(stderr, "%s: embedded %d bits at level %d\n", 
+        progname, bits_per_level, l);
+
+    // descend one level
+    p = p->coarse;
+  }
+
+  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);
+}