[dszlucha]

Using the vision algorithm from the "Using GRIP for the 2016 game" tutorial I was able to do this by adding a Mask operator and hooking the output of the original or resized image to the mask input and the output of the HVL Threshold to the mask input of the mask operator. For whatever reason I couldn't set the output of Find or Filter Contours to the mask input of the Mask operator.

David