diff --git a/src/Constants.cc b/src/Constants.cc
index f2bd76a..f492a2f 100644
--- a/src/Constants.cc
+++ b/src/Constants.cc
@@ -85,6 +85,11 @@ void Constants::Init(Local<Object> target) {
   CONST_ENUM(NORM_RELATIVE);
   CONST_ENUM(NORM_TYPE_MASK);
 
+  CONST_ENUM(RETR_EXTERNAL);
+  CONST_ENUM(RETR_LIST);
+  CONST_ENUM(RETR_CCOMP);
+  CONST_ENUM(RETR_TREE);
+
   target->Set(Nan::New("Constants").ToLocalChecked(), obj);
 }
 
diff --git a/src/Matrix.cc b/src/Matrix.cc
index 51525ff..5985a6d 100755
--- a/src/Matrix.cc
+++ b/src/Matrix.cc
@@ -70,6 +70,7 @@ void Matrix::Init(Local<Object> target) {
   Nan::SetPrototypeMethod(ctor, "bitwiseNot", BitwiseNot);
   Nan::SetPrototypeMethod(ctor, "bitwiseAnd", BitwiseAnd);
   Nan::SetPrototypeMethod(ctor, "countNonZero", CountNonZero);
+  Nan::SetPrototypeMethod(ctor, "moments", Moments);
   Nan::SetPrototypeMethod(ctor, "canny", Canny);
   Nan::SetPrototypeMethod(ctor, "dilate", Dilate);
   Nan::SetPrototypeMethod(ctor, "erode", Erode);
@@ -1354,6 +1355,45 @@ NAN_METHOD(Matrix::Split) {
   info.GetReturnValue().Set(Nan::Null());
 } */
 
+NAN_METHOD(Matrix::Moments) {
+  Nan::HandleScope scope;
+
+  Matrix *self = Nan::ObjectWrap::Unwrap<Matrix>(info.This());
+
+  cv::Moments mo = moments( self->mat, false );
+
+  Local<Object> res = Nan::New<Object>();
+
+  res->Set(Nan::New("m00").ToLocalChecked(), Nan::New<Number>(mo.m00));
+  res->Set(Nan::New("m10").ToLocalChecked(), Nan::New<Number>(mo.m10));
+  res->Set(Nan::New("m01").ToLocalChecked(), Nan::New<Number>(mo.m01));
+  res->Set(Nan::New("m20").ToLocalChecked(), Nan::New<Number>(mo.m20));
+  res->Set(Nan::New("m11").ToLocalChecked(), Nan::New<Number>(mo.m11));
+  res->Set(Nan::New("m02").ToLocalChecked(), Nan::New<Number>(mo.m02));
+  res->Set(Nan::New("m30").ToLocalChecked(), Nan::New<Number>(mo.m30));
+  res->Set(Nan::New("m21").ToLocalChecked(), Nan::New<Number>(mo.m21));
+  res->Set(Nan::New("m12").ToLocalChecked(), Nan::New<Number>(mo.m12));
+  res->Set(Nan::New("m03").ToLocalChecked(), Nan::New<Number>(mo.m03));
+
+  res->Set(Nan::New("mu20").ToLocalChecked(), Nan::New<Number>(mo.mu20));
+  res->Set(Nan::New("mu11").ToLocalChecked(), Nan::New<Number>(mo.mu11));
+  res->Set(Nan::New("mu02").ToLocalChecked(), Nan::New<Number>(mo.mu02));
+  res->Set(Nan::New("mu30").ToLocalChecked(), Nan::New<Number>(mo.mu30));
+  res->Set(Nan::New("mu21").ToLocalChecked(), Nan::New<Number>(mo.mu21));
+  res->Set(Nan::New("mu12").ToLocalChecked(), Nan::New<Number>(mo.mu12));
+  res->Set(Nan::New("mu03").ToLocalChecked(), Nan::New<Number>(mo.mu03));
+
+  res->Set(Nan::New("nu20").ToLocalChecked(), Nan::New<Number>(mo.nu20));
+  res->Set(Nan::New("nu11").ToLocalChecked(), Nan::New<Number>(mo.nu11));
+  res->Set(Nan::New("nu02").ToLocalChecked(), Nan::New<Number>(mo.nu02));
+  res->Set(Nan::New("nu30").ToLocalChecked(), Nan::New<Number>(mo.nu30));
+  res->Set(Nan::New("nu21").ToLocalChecked(), Nan::New<Number>(mo.nu21));
+  res->Set(Nan::New("nu12").ToLocalChecked(), Nan::New<Number>(mo.nu12));
+  res->Set(Nan::New("nu03").ToLocalChecked(), Nan::New<Number>(mo.nu03));
+
+  info.GetReturnValue().Set(res);
+}
+
 NAN_METHOD(Matrix::Canny) {
   Nan::HandleScope scope;
 
diff --git a/src/Matrix.h b/src/Matrix.h
index 2d48a59..042c86d 100755
--- a/src/Matrix.h
+++ b/src/Matrix.h
@@ -74,6 +74,7 @@ public:
   JSFUNC(BitwiseAnd)
   JSFUNC(CountNonZero)
   //JSFUNC(Split)
+  JSFUNC(Moments)
   JSFUNC(Canny)
   JSFUNC(Dilate)
   JSFUNC(Erode)