diff --git a/scanner.c b/scanner.c
new file mode 100644
index 0000000..8befd32
--- /dev/null
+++ b/scanner.c
@@ -0,0 +1,124 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <dirent.h>
+#include <sys/types.h>
+#include <string.h>
+#include <math.h>
+
+typedef struct Face {
+  long double descriptor[128];
+  int faceId;
+  long double *distances;
+  struct Face *next;
+  struct Face *prev;
+} Face;
+
+Face *readFaceDescriptor(int id, char *path) {
+  FILE *f;
+  char buf[5000];
+  Face *pFace = (Face *)malloc(sizeof(Face));
+  memset(pFace, 0, sizeof(Face));
+  f = fopen(path, "r");
+  if (!f) {
+    free(pFace);
+    return NULL;
+  }
+  size_t s = fread(buf, 1, sizeof(buf), f);
+
+  char *p = buf;
+  buf[s] = 0;
+  while (*p && *p != '-' && *p != '+' && (*p < '0' || *p > '9')) {
+    p++;
+  }
+  for (int i = 0; i < 128; i++) {
+    char *start = p;
+    while (*p && *p != ',' && *p != ']' && *p != ' ' && *p != '\n') {
+      p++;
+    }
+    if (!*p) {
+      break;
+    }
+    *p++ = 0;
+    sscanf(start, "%Lf", &pFace->descriptor[i]);
+  }
+
+  pFace->faceId = id;
+  pFace->next = pFace->prev = NULL;
+
+  return pFace;
+}
+
+long double euclideanDistance(long double *a, long double *b) {
+  long double sum = 0.0;
+  for (int i = 0; i < 128; i++) {
+    long double delta = a[i] - b[i];
+    sum += delta * delta;
+  }
+  return sqrtl(sum);
+}
+
+int main(int argc, char *argv[]) {
+  int i;
+  Face *pChain = NULL;
+  for (i = 0; i < 100; i++) {
+    char buf[1028];
+    sprintf(buf, "%s/face-data/%d", argv[1], i);
+    DIR *faceDir = opendir(buf);
+
+    if (!faceDir) {
+      printf("Can not open %s\n", buf);
+    } else {
+      struct dirent *ent;
+      while ((ent = readdir(faceDir)) != NULL) {
+        if (strstr(ent->d_name, ".json") == NULL) {
+          continue;
+        }
+        int id = 0;
+        char *p = ent->d_name;
+        while (*p && *p != '-') {
+          id *= 10;
+          id += *p - '0';
+          p++;
+        }
+        char path[1028*2];
+        sprintf(path, "%s/%s", buf, ent->d_name);
+        Face *pFace = readFaceDescriptor(id, path);
+        if (!pFace) {
+          continue;
+        }
+        if (pChain) {
+          pFace->next = pChain;
+        }
+        pChain = pFace;
+      }
+      closedir(faceDir);
+    }
+  }
+  Face *pLink = pChain;
+  int len = 0;
+  while (pLink) {
+    Face *tmp = pLink;
+    len++;
+    pLink = pLink->next;
+  }
+  pLink = pChain;
+  while (pLink) {
+    pLink->distances = (long double *)malloc(sizeof(long double) * len);
+    int index = 0;
+    Face *pTarget = pChain;
+    while (pTarget) {
+      if (pTarget == pLink) {
+        pLink->distances[index] = 0.0;
+      } else {
+        pLink->distances[index] = euclideanDistance(pLink->descriptor, pTarget->descriptor);
+        if (pLink->distances[index] < 0.4) {
+          printf("%Lf: %5d -> %5d\n", pLink->distances[index], pLink->faceId, pTarget->faceId);
+        }
+      }
+      pTarget = pTarget->next;
+    }
+    pLink = pLink->next;
+  }
+  printf("%d faces.\n", len);
+  return 0;
+}
\ No newline at end of file
diff --git a/server/routes/photos.js b/server/routes/photos.js
index e1d1455..dd28958 100755
--- a/server/routes/photos.js
+++ b/server/routes/photos.js
@@ -793,7 +793,7 @@ function getFacesForPhoto(id) {
       return photoDB.sequelize.query(
         "SELECT face1Id,face2Id " +
         "FROM facedistances " +
-        "WHERE distance>0 AND distance<=0.5 AND (face1Id=:id OR face2Id=:id)", {
+        "WHERE distance<=0.5 AND (face1Id=:id OR face2Id=:id)", {
         replacements: {
           id: face.id
         },