--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Meerwald-dir/cmp_dugad_sig.c	Fri Dec 20 13:08:59 2024 +0100
@@ -0,0 +1,149 @@
+#include "wm.h"
+
+char *progname;
+
+void usage(void) {
+  fprintf(stderr, "usage: %s [-h] [-s file] [-C] [-o file] [-v] file\n\n", progname);
+  fprintf(stderr, "\t-C\t\toutput correlation only\n");
+  fprintf(stderr, "\t-h\t\tprint usage\n");
+  fprintf(stderr, "\t-o file\t\toutput file\n");
+  fprintf(stderr, "\t-s file\t\tignored\n");
+  exit(0);
+}
+
+int main(int argc, char *argv[]) {
+
+  FILE *in = stdin;
+  FILE *out = stdout;
+
+  char output_name[MAXPATHLEN] = "(stdout)";
+  char input_name[MAXPATHLEN] = "(stdin)";
+
+  int c, i, n, ok;
+  int levels;
+  double alpha;
+  double diff;
+  char line[32];
+
+  int correlation_only = 0;
+  int verbose = 0;
+	
+  progname = argv[0];
+
+  while ((c = getopt(argc, argv, "h?Co:v:s:")) != EOF) {
+    switch (c) {
+      case 'h':
+      case '?':
+        usage();
+        break;
+      case 'C':
+        correlation_only = 1;
+        break;
+      case 's':
+        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 '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], "r")) == NULL) {
+      fprintf(stderr, "%s: unable to open input file %s\n", progname, argv[0]);
+      exit(1);
+    }
+    else
+      strcpy(input_name, argv[0]);
+  }
+  
+  fgets(line, sizeof(line), in);
+  if (strspn(line, "DGWM") < 4) {
+    fprintf(stderr, "%s: watermark file %s invalid\n", progname, input_name);
+    exit(1);
+  }
+
+  fscanf(in, "%d\n", &levels);
+  fscanf(in, "%lf\n", &alpha);
+
+  n = 3 * levels;
+  ok = 0;
+  diff = 0.0;
+  for (i = 0; i < levels; i++) {
+    int m;
+    double z, v;
+
+    // HL subband
+    fscanf(in, "%d %lf %lf\n", &m, &z, &v);
+    if (verbose && !correlation_only) {
+      if (m)
+        fprintf(out, "%f %f\n",  z /  (double) m, (v * alpha) / (double) (1.0 * m));
+      else
+        fprintf(out, "0.0 0.0\n");
+    }
+    if (m) {
+      ok += (z > v * alpha / (double) 1.0) ? 1 : 0;
+      diff += ((z - v * alpha) / (double) (1.0 * m)); 
+    }
+    else
+      n--;
+
+    // LH subband
+    fscanf(in, "%d %lf %lf\n", &m, &z, &v);
+    if (verbose && !correlation_only) {
+      if (m)
+        fprintf(out, "%f %f\n", z / (double) m, (v * alpha) / (double) (1.0 * m));
+      else
+        fprintf(out, "0.0 0.0\n");
+    }
+    if (m) {
+      ok += (z > v * alpha / (double) 1.0) ? 1 : 0;
+      diff += ((z - v * alpha) / (double) (1.0 * m)); 
+    }
+    else
+      n--;
+
+    // HH subband
+    fscanf(in, "%d %lf %lf\n", &m, &z, &v);
+    if (verbose && !correlation_only) {
+      if (m)
+        fprintf(out, "%f %f\n", z / (double) m, (v * alpha) / (double) (1.0 * m));
+      else
+        fprintf(out, "0.0 0.0\n");
+    }
+    
+    if (m) {
+      ok += (z > v * alpha / (double) 1.0) ? 1 : 0;
+      diff += ((z - v * alpha) / (double) (1.0 * m)); 
+    }
+    else
+      n--;
+  }
+
+  if (!correlation_only)
+    fprintf(out, "%d/%d, diff %f\n", ok, n, diff);
+  fprintf(out, "%f\n", (double) ok / (double) n);
+
+  fclose(out);
+  fclose(in);
+
+  exit(0);
+}