diff --git a/src/Matrix.cc b/src/Matrix.cc
index 0645c95..46be855 100755
--- a/src/Matrix.cc
+++ b/src/Matrix.cc
@@ -1,6 +1,7 @@
 #include "Contours.h"
 #include "Matrix.h"
 #include "OpenCV.h"
+#include <string.h>
 #include <nan.h>
 
 Nan::Persistent<FunctionTemplate> Matrix::constructor;
@@ -1629,25 +1630,62 @@ NAN_METHOD(Matrix::Threshold) {
 
   double threshold = info[0]->NumberValue();
   double maxVal = info[1]->NumberValue();
-
   int typ = cv::THRESH_BINARY;
-  if (info.Length() == 3) {
-    //    typ = info[2]->IntegerValue();
+
+  if (info.Length() >= 3) {
     Nan::Utf8String typstr(info[2]);
+
     if (strcmp(*typstr, "Binary") == 0) {
-      typ = 0;
+      // Uses default value
     }
-    if (strcmp(*typstr, "Binary Inverted") == 0) {
-      typ = 1;
+    else if (strcmp(*typstr, "Binary Inverted") == 0) {
+      typ = cv::THRESH_BINARY_INV;
     }
-    if (strcmp(*typstr, "Threshold Truncated") == 0) {
-      typ = 2;
+    else if (strcmp(*typstr, "Threshold Truncated") == 0) {
+      typ = cv::THRESH_TRUNC;
     }
-    if (strcmp(*typstr, "Threshold to Zero") == 0) {
-      typ = 3;
+    else if (strcmp(*typstr, "Threshold to Zero") == 0) {
+      typ = cv::THRESH_TOZERO;
     }
-    if (strcmp(*typstr, "Threshold to Zero Inverted") == 0) {
-      typ = 4;
+    else if (strcmp(*typstr, "Threshold to Zero Inverted") == 0) {
+      typ = cv::THRESH_TOZERO_INV;
+    }
+    else {
+      char *typeString = *typstr;
+      char text[] = "\" is no supported binarization technique. "
+        "Use \"Binary\" (default), \"Binary Inverted\", "
+        "\"Threshold Truncated\", \"Threshold to Zero\" "
+        "or \"Threshold to Zero Inverted\"";
+      char errorMessage[strlen(typeString) + strlen(text) + 2];
+      strcpy(errorMessage, "\"");
+      strcat(errorMessage, typeString);
+      strcat(errorMessage, text);
+
+      Nan::ThrowError(errorMessage);
+      return;
+    }
+  }
+
+  if (info.Length() >= 4) {
+    Nan::Utf8String algorithm(info[3]);
+
+    if (strcmp(*algorithm, "Simple") == 0) {
+        // Uses default
+    }
+    else if (strcmp(*algorithm, "Otsu") == 0) {
+      typ += 8;
+    }
+    else {
+      char *algo = *algorithm;
+      char text[] = "\" is no supported threshold algorithm. "
+        "Use \"Simple\" (default) or \"Otsu\".";
+      char errorMessage[strlen(algo) + strlen(text) + 2];
+      strcpy(errorMessage, "\"");
+      strcat(errorMessage, algo);
+      strcat(errorMessage, text);
+
+      Nan::ThrowError(errorMessage);
+      return;
     }
   }