diff --git a/vtkm/worklet/Wavelets.h b/vtkm/worklet/Wavelets.h
index a9537d404..609d32176 100644
--- a/vtkm/worklet/Wavelets.h
+++ b/vtkm/worklet/Wavelets.h
@@ -28,19 +28,50 @@
 namespace vtkm {
 namespace worklet {
 
+namespace internal{
+
+  const vtkm::Float64 hm4_44[9] = {
+    0.037828455507264,
+    -0.023849465019557,
+    -0.110624404418437,
+    0.377402855612831,
+    0.852698679008894,
+    0.377402855612831,
+    -0.110624404418437,
+    -0.023849465019557,
+    0.037828455507264
+  };
+
+  const vtkm::Float64 h4[9] = {
+    0.0,
+    -0.064538882628697,
+    -0.040689417609164,
+    0.418092273221617,
+    0.788485616405583,
+    0.418092273221617,
+    -0.0406894176091641,
+    -0.0645388826286971,
+    0.0
+  };
+}
+
 class Wavelets
 {
 public:
+
   // helper worklet
   class ForwardTransform: public vtkm::worklet::WorkletMapField
   {
   public:
-    typedef void ControlSignature(WholeArrayIn<ScalarAll>,  // sigIn
-                                  FieldOut<ScalarAll>,      // cA
-                                  FieldOut<ScalarAll>);     // cD
-    typedef void ExecutionSignature(_1, _2, _3, WorkIndex);
+    typedef void ControlSignature(WholeArrayIn<ScalarAll>,     // sigIn
+                                  WholeArrayIn<vtkm::Float64>, // lowFilter
+                                  WholeArrayIn<vtkm::Float64>, // highFilter
+                                  FieldOut<ScalarAll>);        // cA in even indices, cD in odd indices
+    typedef void ExecutionSignature(_1, _2, _3, _4, WorkIndex);
     typedef _1   InputDomain;
 
+    typedef vtkm::Float64 FLOAT;
+
     // ForwardTransform constructor
     VTKM_CONT_EXPORT
     ForwardTransform() 
@@ -51,16 +82,25 @@ public:
     }
 
 
-    template <typename T, typename ArrayPortalType>
+    template <typename InputSignalPortalType,
+              typename FilterPortalType,
+              typename OutputCoeffType>
     VTKM_EXEC_EXPORT
-    void operator()(const ArrayPortalType &signalIn, 
-                    T &coeffApproximation,
-                    T &coeffDetail,
+    void operator()(const InputSignalPortalType &signalIn, 
+                    const FilterPortalType      &lowFilter,
+                    const FilterPortalType      &highFilter,
+                    OutputCoeffType &coeffOut,
                     const vtkm::Id &workIndex) const
     {
-        vtkm::Float64 tmp  = static_cast<vtkm::Float64>(signalIn.Get(workIndex));
-        coeffApproximation = static_cast<T>( tmp / 2.0 );
-        coeffDetail        = static_cast<T>( tmp * 2.0 );
+        FLOAT tmp  = static_cast<FLOAT>(signalIn.Get(workIndex));
+        if( workIndex % 2 == 0 )    // work on cA, approximate coeffs
+        {
+          coeffOut = static_cast<OutputCoeffType>( tmpi + lowFilter.Get(0) );
+        }
+        else                        // work on cD, detail coeffs
+        {
+          coeffOut = static_cast<OutputCoeffType>( tmp + highFilter.Get(0) );
+        }
     }
 
   private:
diff --git a/vtkm/worklet/testing/UnitTestWavelets.cxx b/vtkm/worklet/testing/UnitTestWavelets.cxx
index daa129859..85e6614e3 100644
--- a/vtkm/worklet/testing/UnitTestWavelets.cxx
+++ b/vtkm/worklet/testing/UnitTestWavelets.cxx
@@ -33,26 +33,28 @@ void TestWavelets()
   vtkm::Id arraySize = 10;
   std::vector<vtkm::Float32> tmpVector;
   for( vtkm::Id i = 0; i < arraySize; i++ )
-    tmpVector.push_back(static_cast<vtkm::Float32>(i*2));
+    tmpVector.push_back(static_cast<vtkm::Float32>(i));
  
  
   vtkm::cont::ArrayHandle<vtkm::Float32> input1DArray = 
     vtkm::cont::make_ArrayHandle(tmpVector);
   vtkm::cont::ArrayHandle<vtkm::Float32> outputArray1;
+/*
   outputArray1.Allocate( arraySize );
   vtkm::cont::ArrayHandle<vtkm::Float32> outputArray2;
   outputArray2.Allocate( arraySize );
+*/
 
   vtkm::worklet::Wavelets::ForwardTransform forwardTransform;
   vtkm::worklet::DispatcherMapField<vtkm::worklet::Wavelets::ForwardTransform> dispatcher(forwardTransform);
-  dispatcher.Invoke(input1DArray, outputArray1, outputArray2);
+  dispatcher.Invoke(input1DArray, outputArray1);
 
   std::cerr << "Invoke succeeded" << std::endl;
 
   for (vtkm::Id i = 0; i < outputArray1.GetNumberOfValues(); ++i)
   {
-    std::cout<< outputArray1.GetPortalConstControl().Get(i) << ", "
-             << outputArray2.GetPortalConstControl().Get(i) << std::endl;
+    std::cout<< outputArray1.GetPortalConstControl().Get(i) << std::endl;
+//             << outputArray2.GetPortalConstControl().Get(i) << std::endl;
 //    VTKM_TEST_ASSERT(
 //          test_equal( output1DArray.GetPortalConstControl().Get(i), 
 //                      static_cast<vtkm::Float32>(i) * 2.0f ),