--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Meerwald-dir/wm_corvi_s.c	Fri Dec 20 13:08:59 2024 +0100
@@ -0,0 +1,295 @@
+#include "wm.h"
+#include "wm_dwt.h"
+#include "pgm.h"
+
+char *progname;
+
+void usage(void) {
+  fprintf(stderr, "usage: %s [-a n] [-h] [-n n] [-o file] [-q n] [-s file] [-v n] -i file file\n\n", progname);
+  fprintf(stderr, "\t-a n\t\talpha factor\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-n n\t\twatermark length\n");
+  fprintf(stderr, "\t-o file\t\textracted signature file\n");
+  fprintf(stderr, "\t-q n\t\tquantization/quality factor\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 *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;
+  int i;
+  int quantization = 0;
+  int n = 0;
+  int method = -1;
+  int filter = 0;
+  char filter_name[MAXPATHLEN] = "";
+
+  int level;
+  double alpha = 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, col;
+
+  Image_tree input_dwts;
+  Image_tree orig_dwts;
+
+  int verbose = 0;
+
+  progname = argv[0];
+
+  pgm_init(&argc, argv); wm_init2();
+
+  while ((c = getopt(argc, argv, "a:e:f:F:h?i:n:o:s: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 '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 'n':
+        n = atoi(optarg);
+        if (n < 1 || n > 1000) {
+          fprintf(stderr, "%s: watermark length %d out of range\n", progname, n);
+          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, "CVSG") >= 4) {
+      fscanf(sig, "%d\n", &n);
+      if (alpha == 0.0)
+        fscanf(sig, "%lf\n", &alpha);
+      else
+        fscanf(sig, "%*f\n");
+      if (quantization == 0)
+        fscanf(sig, "%d\n", &quantization);
+      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);
+
+  fclose(in);
+
+  for (row = 0; row < orig_rows; row++)
+    pgm_readpgmrow(orig, orig_image[row], orig_cols, orig_maxval, orig_format);
+
+  fclose(orig);
+
+  level = 0;
+  row = rows;
+  col = cols;
+  while (n < row * col / 4.0 && row >= 2 && col >= 2) {
+    row /= 2;
+    col /= 2;
+    level++;
+  }
+
+  if (verbose >= 2) {
+    fprintf(stderr, "%s: extracting from coarse image (x %d/y %d) at level %d\n", progname, col, row, level);
+  }
+
+  init_dwt(cols, rows, filter_name, filter, level, method);
+  input_dwts = fdwt(input_image);
+  orig_dwts = fdwt(orig_image);
+
+  fprintf(out, "CVSG\n");
+  fprintf(out, "%d\n", n);
+  fprintf(out, "%f\n", alpha);
+  fprintf(out, "%d\n", quantization);
+  fprintf(out, "%d\n", method);
+  fprintf(out, "%d\n", filter);
+  fprintf(out, "%s\n", filter_name);
+
+  {
+    Image_tree p = input_dwts;
+    Image_tree q = orig_dwts;
+    Image input_img;
+    Image orig_img;
+    double input_med;
+    double orig_med;
+
+    while (!p->image)
+      p = p->coarse;
+
+    while (!q->image)
+      q = q->coarse;
+
+    input_img = p->image;
+    orig_img = q->image;
+
+    input_med = 0.0;
+    for (row = 0; row < input_img->height; row++)
+      for (col = 0; col < input_img->width; col++)
+        input_med += get_pixel(input_img, col, row);
+    input_med /= input_img->height * input_img->width;
+
+    orig_med = 0.0;
+    for (row = 0; row < orig_img->height; row++)
+      for (col = 0; col < orig_img->width; col++)
+        orig_med += get_pixel(orig_img, col, row);
+    orig_med /= orig_img->height * orig_img->width;
+
+    row = 0;
+    col = 0;
+    while (n > 0) {
+      Pixel input_pix;
+      Pixel orig_pix;
+      double x;
+
+      input_pix = get_pixel(input_img, col, row);
+      orig_pix = get_pixel(orig_img, col, row);
+
+      x = ((input_pix - orig_pix) / (orig_pix - orig_med)) / alpha;
+
+      fprintf(out, "%f\n", x);
+
+      if (++col == orig_img->width) { col = 0; row++; }
+      n--;
+    }
+  }
+
+  fclose(out);
+
+  pgm_freearray(input_image, rows);
+  pgm_freearray(orig_image, rows);
+
+  exit(0);
+}