       @evaluateAnnotations(seenKnown.P_ref)
 
   #helper method to summarizeKnownObjects
+  getFrameLabels: (numFrames) ->
+    frameLabels = ( "000#{i}" for i in [1..numFrames] by 1 )
+      
+  #helper method to summarizeKnownObjects
   firstSeen:(knownObject) ->
     x = Math.round(knownObject.x)
     y = Math.round(knownObject.y)

  #helper method to summarizeKnownObjects
  averageSeenKnownPoints: (seenKnown) ->
    HALF_WINDOW_HEIGHT = 256
    HALF_WINDOW_WIDTH =  190
    #average the values of x and y
    seenKnown.x = seenKnown.x_accum /seenKnown.counter
    seenKnown.y = seenKnown.y_accum /seenKnown.counter

    # grab the point reference before scale
    seenKnown.P_ref = x:  seenKnown.x, y:  seenKnown.y
    #apply scaling 
    seenKnown.x =  seenKnown.x/HALF_WINDOW_HEIGHT * SCALING_FACTOR
    seenKnown.y =  seenKnown.y/HALF_WINDOW_HEIGHT * SCALING_FACTOR
    seenKnown

  appendMetadata: ->
